Answer:
v = 37.4 m/s , h = 71.39m
Explanation:
To find the velocity given:
m = 0.4 kg
F =190.4 N
d = 1.47 m
g = 9.8 m/s^2
So use the equation of work to solve the kinetic energy
W = F *d = 190.4 N * 1.47m
W = 279.88 J
Ke = 1 / 2 * m* v^2
v = √2*Ke / m =√ 2 *279.88 / 0.4 kg
v = 37.4 m/s
Now to find the high to rise can use the conserved law so:
Ke = Pe
279.88 = m*g*h
Solve to h'
h = 279.88 / 0.4kg * 9.8m/s^2
h =71.39 m
Final answer:
The arrow leaves the bow with a speed of approximately 37.49 m/s and, when shot straight up, rises to a maximum height of about 71.4 m.
Explanation:
To determine the speed with which the arrow leaves the bow, we apply the work-energy principle, which states that work done on the arrow is converted into its kinetic energy. The work done W by the bow can be calculated by multiplying the force F exerted by the distance d over which the force is applied: W = F × d. It is given that F is 190.4 N and d is 1.47 m; thus, W = 190.4 N × 1.47 m = 279.888 J.
The kinetic energy KE of the arrow can be given by KE = ½ mv², where m is the mass of the arrow and v is its velocity. Since work done equals the kinetic energy, we get 279.888 J = ½ × 0.4 kg × v². Solving for v gives us a velocity of approximately 37.49 m/s.
To find how high the arrow goes if it's shot straight up, we use the conservation of energy, where the initial kinetic energy is converted to gravitational potential energy at the highest point. The potential energy PE at maximum height can be given by PE = mgh, where g is the acceleration due to gravity (9.8 m/s²) and h is the height. Setting KE equal to PE, we have 279.888 J = 0.4 kg × 9.8 m/s² × h. Solving for h gives us a maximum height of approximately 71.4 m.
A neutral group of atoms held together by covalent bonds is a
Answer:
Molecule
Explanation:
A molecule is a particle made up of two or more atoms held together by chemical bonds. A molecule is different from an ion because it does not carries a charge. Molecules are chemically bonded together by either covalent bonding or ionic bonding. A covalent bond involves the sharing of electron pairs between atoms. Examples of molecule with covalent bonding include H₂ and NH₃ . Therefore, a neutral group of atoms held together by covalent bonds is a molecule.
A neutral group of atoms held together by covalent bonds is called a molecule. This can involve same elements, as in the molecule H2, or different elements, as in chemical compounds like H2O or CH4. These molecules or compounds form when atoms share electrons via covalent bonds, creating a stable and typically less reactive group.
Explanation:A neutral group of atoms held together by covalent bonds is referred to as a molecule. Covalent bonds form when atoms share electrons rather than transfer them. This electrical attraction holds the atoms together, creating a stable group typically less reactive than its component atoms when separated. For instance, a single molecule of hydrogen gas, represented as H2, consists of two hydrogen atoms bonded covalently.
Molecules may comprise atoms of the same element, as in H2, or different elements, as in a chemical compound like water (H2O) or methane (CH4). In such compounds, more than two atoms are held together by covalent bonds. These compounds are discrete, neutral, and often exist as gases, low-boiling liquids, or low-melting solids under normal conditions, although exceptions exist.
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Two kids create a makeshift seesaw by setting a 4-m long uniform plank on a saw horse. The saw horse is 0.5 m to the left of the center of mass of the plank. The child of mass m1 = 48 kg sits at the left end of the plank. The child of mass m2 = 35 kg sits 1 m to the right of the center of mass of the plank. What is the mass of the plank?
Answer:
39kg
Explanation:
As this system is balanced on the saw horse, the total net torque by the children and plank gravity must be 0
Since child 2 and the plank center of mass are both on the right of the saw horse, their torque is in opposite direction, so so are their signs:
[tex]T_1 - T_p - T_2 = 0[/tex]
[tex]m_1gL_1 - m_pgL_p - m_2gL_2 = 0[/tex]
[tex]m_1L_1 - m_pL_p - m_2L_2 = 0[/tex]
where m1 = 48 kg is the mass of the first child on the left at L1 = 1.5 m
mp is the mass of the plank on the right of the saw horse Lp = 0.5 m
m2 = 35 kg is the mass of the 2nd child on the right at L2 = 1.5 m
Substitute all the parameters above and we get
[tex]48*1.5 - m_p0.5 -35*1.5 = 0[/tex]
[tex]72 - 52.5 = 0.5m_p[/tex]
[tex]19.5 = 0.5m_p[/tex]
[tex]m_p = 39 kg[/tex]
A lady perspires. How much liquid water (as a percentage of the mass of the lady) must evaporate to lower the temperature of said lady by 5°C? [Assume that the specific heat of the human body is approximately that of water, 4200 J K-1kg-1.]
Answer:
0.929%
Explanation:
[tex]m[/tex] = mass of water evaporated
[tex]M[/tex] = mass of the lady
[tex]c[/tex] = specific heat of human body = 4200 JK⁻¹kg⁻¹
[tex]L[/tex] = Latent heat of evaporation of water = 2260000 Jkg⁻¹
[tex]\Delta T[/tex] = Drop in temperature = 5 C
Using conservation of heat
[tex]m L = Mc \Delta T \\m (2260000) = M (4200) (5)\\m (2260000) = M (21000)\\m = 0.00929 M \\\frac{m}{M} = 0.00929\\\frac{m(100)}{M} = (0.00929) (100)\\\\\frac{m(100)}{M} = 0.929[/tex]
A ledge on a building is 20 m above the ground. A taut rope attached to a 4.0 kg can of paint sitting on the ledge passes up over a pulley and straight down to a 3.0 kg can of nails on the ground. If the can of paint is accidently knocked off the ledge, what time interval does a carpenter have to catch the can before it smashes on the floor?
Answer:
t = 5.4 s
Explanation:
from the question we are given :
height (s) = 20 m
mass of paint (Mp) = 4 kg
mass of nails (Mn) = 3 kg
acceleration due to gravity (g) = 9.8 m/s^{2}
The net force accelerating the can of paint should be equal to the difference in weight of the can of paint and the can of nails.weight of nails = mass of nails x g = 3 x 9.8 = 29.4 N
weight of paint = mass nails x g = 4 x 9.8 = 39.2 N
net force = 39.2 - 29.4 = 9.8 N
net force = total mass x acceleration9.8 = (3 +4) x a
a = 1.4 m/s^{2}
from S = Ut + 0.5at^{2} we can get the time the carpenter has to catch the nailswhere U is the initial velocity and is 0 since the can was initially at
rest
20 = (0 x t) + (0.5 x 1.4 x t^{2})
20 = 0.7 x t^{2}
t^{2} = 28.6
t = 5.4 s
The zone of earthquakes and volcanoes surrounding the pacific ocean is called
Answer:
The Ring of Fire
Explanation:
The ring of fire is also called the Circum-Pacific Belt, it is a path along the pacific ocean consisting of active volcanoes and frequent earthquakes.
It has a length of approximately 40,000 kilometers. It lies on the edge of tectonic plates where the in-earth vibrations and geothermal energies are prone to erupt out.
Ring of fire inhibits about 75% o the earth's volcanoes and 95% of earthquakes occur in this region.
A player passes a 0.600-kg basketball down court for a fast break. The ball leaves the player's hands with a speed of 8.70 m/s and slows down to 7.10 m/s at its highest point. Part A Ignoring air resistance, how high above the release point is the ball when it is at its maximum height?B) How would doubling the ball's mass affect the result in part (a)?
Answer:
1.29 m
Explanation:
mass of ball = 0.6 kg
initial velocity, u = 8.7 m/s
final velocity, v = 7.1 m/s
acceleration due to gravity, g = - 9.8 m/s^2
(a) Let the ball reaches to a height of h.
Use third equation of motion
[tex]v^{2}=u^{2}+2as[/tex]
[tex]7.1^{2}=8.7^{2}- 2 \times 9.8 \times h[/tex]
h = 1.29 m
Thus, the maximum height attained by the ball is 1.29 m.
By applying the principle of conservation of energy, the maximum height of the ball above its release point is calculated to be approximately 1.29 meters. Doubling the ball's mass would not affect this result because the height is independent of mass when air resistance is ignored.
Part A: Calculating Maximum Height
To find the height reached, we will use the principle of conservation of energy. The mechanical energy at the release point equals the mechanical energy at the highest point.
Step-by-Step Explanation:
Calculate the initial kinetic energy:
[tex]KE_{initial[/tex] = 0.5 * mass * (initial speed)²
[tex]KE_{initial[/tex] = 0.5 * 0.600 kg * (8.70 m/s)²
[tex]KE_{initial[/tex] = 22.686 J
Calculate the kinetic energy at the highest point:
[tex]KE_{highest[/tex] = 0.5 * mass * (speed at highest point)²
[tex]KE_{highest[/tex] = 0.5 * 0.600 kg * (7.10 m/s)²
[tex]KE_{highest[/tex] = 15.099 J
Determine the change in kinetic energy:
ΔKE = [tex]KE_{initial[/tex] - [tex]KE_{highest[/tex]
ΔKE = 22.686 J - 15.099 J = 7.587 J
Set this equal to the gravitational potential energy gained (since potential energy gained equals kinetic energy lost):
ΔKE = PE
m * g * h = 7.587 J
0.600 kg * 9.8 m/s² * h = 7.587 J
h = 7.587 J / (0.600 kg * 9.8 m/s²)
h ≈ 1.29 m
The ball reaches approximately 1.29 meters above the release point at its maximum height.
Part B: Effect of Doubling the Mass
In the absence of air resistance, the height reached by the ball is independent of its mass. This is because both the kinetic energy and gravitational potential energy are directly proportional to mass, and it cancels out in the equations. Therefore, doubling the ball's mass would not affect the result in part (a).
A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the substance?
a. heating it to find the temperature at which it melts
b. exposing it to a flame to see if it catches on fire
c. hitting it with a hammer to determine if it breaks or bends
d. placing it in water to find out whether or not it dissolves
Answer:
b. exposing it to a flame to see if it catches on fire
Explanation:
The Procedure will most likely help to determine a chemical property of substance is : exposing material to a flame to see if it catches on fire Chemical property is the characteristic that a substance has that differentiate it from another substance. The most common charatcteristics that most scientists wanted to know are : - It's flammability - It's radioactivity - Its toxicity By throwing the object into fire, we will easily find out these 3 characteristics
Hence the correct answer is b. exposing it to a flame to see if it catches on fire.
Answer:
Exposing it to a flame to see if it catches on fire
Explanation:
This is known as the flame test; The flame test is used to visually determine the identity of an unknown metal ions in a compound.
With the help of the flame test, the scientist can make use it as a qualitative test that guides him in making decision when trying to pinpoint the identity of the solid.
When the solid is exposed to flame, there may be a characteristic color given off that is visible to the naked eye (Note: Not all solids give flame colors).
The colors observed during the flame test result from the excitement of the electrons caused by the increased temperature. When the atoms of the electron are excited, for instance by, their electrons are able to move from their ground state to higher energy levels.
With this, the scientist can draw a valid conclusion.
Write an expression for a harmonic wave with an amplitude of 0.19 m, a wavelength of 2.6 m, and a period of 1.2 s. The wave is transverse, travels to the right, and has a displacement of 0.19 m at t = 0 and x = 0.
Answer:
[tex]y = 0.19 sin(5.23 t - 2.42x + \frac{\pi}{2})[/tex]
Explanation:
As we know that the wave equation is given as
[tex]y = A sin(\omega t - k x + \phi_0)[/tex]
now we have
[tex]A = 0.19 m[/tex]
[tex]\lambda = 2.6 m[/tex]
so we have
[tex]k = \frac{2\pi}{\lambda}[/tex]
[tex]k = \frac{2\pi}{2.6}[/tex]
[tex]k = 2.42 per m[/tex]
also we have
[tex]T = 1.2 s[/tex]
so we have
[tex]\omega = \frac{2\pi}{T}[/tex]
[tex]\omega = \frac{2\pi}{1.2}[/tex]
[tex]\omega = 5.23 rad/s[/tex]
now we know that at t = 0 and x = 0 wave is at y = 0.19 m
so we have
[tex]\phi_0 = \frac{\pi}{2}[/tex]
so we have
[tex]y = 0.19 sin(5.23 t - 2.42x + \frac{\pi}{2})[/tex]
Steel train rails are laid in 12.0-m-long segments placed end to end. The rails are laid on a winter day when their temperature is −9.0∘C. (a) How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 33.0∘C? (b) If the rails are originally laid in contact, what is the stress in them on a summer day when their temperature is 33.0∘C?
Answer:
a) Space = [tex] 6.05 x 10^{-3} m = 0.605 cm [/tex]
b) Stress= [tex] -100.8 x 10^{6} Pa [/tex]
Explanation:
1) Data Given
[tex] L = 12 m , T_i = -9 C \degree, T_f = 33 C \degree [/tex]
2) Calculate the space using Linear thermal expansion formula
We need to use Linear thermal expansion formula since the space created would be a change on 1 dimension, the increase of the temperature will increase the length of the steel. The formula is given by:
[tex] \Delta L = L_i \alpha_{steel} \Delta T [/tex]
We have everything except the [tex] \alpha_{steel} [/tex] , so we look for this on a book and we find that [tex] \alpha_{steel} = 1.2 x 10^{-5} C^{-1} [/tex], so we can replace.
[tex] \Delta L = 12 m (1.2 x 10^{-5} C^{-1}) (33 C \degree -(-9 C \degree)) = 12 m (1.2 x 10^{-5} C^{-1}) 42 C \degree =6.048 x 10^{-3} m = 0.6048cm [/tex]
3) Calculate the stress of the steel
The Stress is the ratio of applied force F to a cross section area - defined as
[tex] \sigma = \frac{F_n}{A} [/tex]
Since we don't have the force and the Area, we need to look for another way to find the stress.
For this we can use the concept called Young's Modulus, defined as : "the mechanical property that measures the stiffness of a solid material", and the formula for this is given by:
[tex] Y =\frac{F L}{A \Delta L} [/tex] (1)
Solving [tex] \frac{F}{A} [/tex] from the previous formula we have this:
[tex] \frac{F}{A} [/tex] = (Y Δ L)/L (2)
From the Linear thermal expansion formula we can solve like this
[tex] \frac{\Delta L}{L} [/tex] = α ΔT (3)
And replacing equation (3) into equation (2) we have:
[tex] \frac{F}{A} [/tex] = Y α ΔT (4)
We have that the Young's Modulus for the steel is 20x10^{10} Pa, so replacing into equation (4)
[tex] \frac{F}{A} [/tex] = [tex] 20x10^{10} [/tex] Pa (1.2x10^-5 C^-1) (42C) = [tex] 100.8 *10^{6} [/tex] Pa
That represent the absolute value for the Stress, the sign on this case would be negative since there is a compression.
The rail segment's length change due to thermal expansion can be calculated using the formula ∆L = αL0∆T, which gives the space to be left between rails. When the rails are constrained, thermal stress can be determined using the formula σ= Eα∆T, demonstrating the stress in the steel rails during the summer.
Explanation:Calculating the expansion of steel train tracksTo solve this physics problem, one must first calculate the change in length of the steel rails due to thermal expansion, which introduces the concept of thermal stress—a stress created through thermal expansion or contraction of materials. The formula used is ∆L = αL0∆T, where ∆L is the change in length, α is the coefficient of linear expansion for steel (around 12 × 10⁻⁶ °C⁻¹), L0 is the initial length of the steel rails (12 meters), and ∆T is the change in temperature (33 - (-9) = 42 degrees Celsius). The calculation will yield the amount of space to be left between the rails, providing the answer to the first part of the question.
Next, to determine the stress in the rails when no gap is left for expansion (assuming they are constrained), the formula is σ= Eα∆T, where E represents Young's modulus (200 × 10⁹ N/m² for steel), and the other variables remain as earlier defined. After calculation, the result will exhibit the thermal stress exerted on the steel rails during the summer. Here, Young's modulus reflects the relationship between stress and strain in the material, indicating how much deformation will happen within the steel rails due to thermal stress.
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When a man stands on a bathroom scale here on Earth, it reads 640 N . Assume each planet to be a perfect sphere with the following parameters.
Planet Mass, kg Radius, m
Mars 6.419×1023 3.396×106
Venus 4.869×1024 6.052×106
Saturn 5.685×1026 6.027×107
Part A: What would his mass be on Mars, Venus, and Saturn?
Part B: What is the magnitude of the gravitational force Mars would exert on the man if he stood on its surface?
Part C: What is the magnitude of the gravitational force Venus would exert on the man if he stood on its surface?
Part D: What is the magnitude of the gravitational force Saturn would exert on the man if he stood on its surface?
Part A: Mass on Mars, Venus, and Saturn: ≈65.21kg
Part B: Gravitational Force on Mars: ≈246.5N
Part C: Gravitational Force on Venus: ≈610.9N
Part D: Gravitational Force on Saturn: ≈572.5N.
Part A: Mass on Different Planets
The weight of an object (the reading on a scale) is given by the formula:
Weight = Mass × Acceleration due to gravity
The acceleration due to gravity on a planet can be calculated using the formula:
Acceleration due to gravity = G × (Planet Mass) / (Planet Radius)²
Where G is the universal gravitational constant.
Given that the weight on Earth is 640 N, we can rearrange the weight formula to solve for mass:
Mass = Weight / Acceleration due to gravity on Earth
The acceleration due to gravity on Earth is approximately 9.81 m/s², and the universal gravitational constant is approximately
6.674 × [tex]10^{-11[/tex] N(m/kg)².
Now we can calculate the mass on different planets:
Mars:
Acceleration due to gravity on Mars = (6.674 × [tex]10^{-11[/tex]) × (6.419 × [tex]10^{23[/tex]) / (3.396 × [tex]10^6[/tex])²
Mass on Mars = 640 N / Acceleration due to gravity on Mars
Venus:
Acceleration due to gravity on Venus = (6.674 × [tex]10^{-11[/tex]) × (4.869 × [tex]10^{24[/tex]) / (6.052 × [tex]10^6[/tex])²
Mass on Venus = 640 N / Acceleration due to gravity on Venus
Saturn:
Acceleration due to gravity on Saturn = (6.674 × [tex]10^{-11[/tex]) × (5.685 × [tex]10^{26[/tex]) / (6.027 × [tex]10^7[/tex])²
Mass on Saturn = 640 N / Acceleration due to gravity on Saturn
So, we get, Mass on Mars, Venus, and Saturn: ≈65.21kg.
Part B: Gravitational Force on Mars
The magnitude of the gravitational force between two objects can be calculated using the formula:
Gravitational Force = (G × Mass of the man × Mass of Mars) / (Radius of Mars)²
Gravitational Force on Mars: ≈246.5N.
Part C: Gravitational Force on Venus
Similar to Part B, use the formula:
Gravitational Force = (G × Mass of the man × Mass of Venus) / (Radius of Venus)²
Gravitational Force on Venus: ≈610.9N.
Part D: Gravitational Force on Saturn
Similar to Parts B and C, use the formula:
Gravitational Force = (G × Mass of the man × Mass of Saturn) / (Radius of Saturn)²
Gravitational Force on Saturn: ≈572.5N.
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The mass of the man on Mars is 171.77 kg, on Venus is72.19 kg, and on Saturn is 61.30 kg. The magnitude of the gravitational force on Mars is 639.78 N, on Venus is 640.52 N, and on Saturn is 640.77 N.
Part A: The mass of the man on Mars can be calculated using the formula:
Weight on Mars = mass on Mars × acceleration due to gravity on Mars
Mass on Mars = Weight on Mars ÷ acceleration due to gravity on Mars
Using the given parameters, we can calculate the mass of the man on Mars, Venus, and Saturn.
Mass on Mars = 640 N ÷ 3.726 m/s^2 = 171.77 kg
Mass on Venus = 640 N ÷ 8.87 m/s^2 = 72.19 kg
Mass on Saturn = 640 N ÷ 10.44 m/s^2 = 61.30 kg
Part B: The magnitude of the gravitational force on Mars can be calculated using the formula:
Gravitational force = Mass of the man × acceleration due to gravity on Mars
Using the calculated mass on Mars from Part A and the gravitational constant of Mars, we can calculate the magnitude of the gravitational force on Mars.
Gravitational force on Mars = 171.77 kg × 3.726 m/s^2 = 639.78 N
Part C: The magnitude of the gravitational force on Venus can be calculated using the same formula as in Part B:
Gravitational force on Venus = 72.19 kg × 8.87 m/s^2 = 640.52 N
Part D: The magnitude of the gravitational force on Saturn can also be calculated using the same formula:
Gravitational force on Saturn = 61.30 kg × 10.44 m/s^2 = 640.77 N
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A helicopter lifts a 60 kg astronaut 17 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? J (b) How much work is done on the astronaut by her weight? J (c) What is the kinetic energy? J (d) What is the speed of the astronaut just before she reaches the helicopter?
Answer:
a) W = 10995.6 J
b) W = - 9996 J
c) Kf = 999.6 J
d) v = 5.77 m/s
Explanation:
Given
m = 60 Kg
h = 17 m
a = g/10
g = 9.8 m/s²
a) We can apply Newton's 2nd Law as follows
∑Fy = m*a ⇒ T - m*g = m*a ⇒ T = (g + a)*m
where T is the force exerted by the cable
⇒ T = (g + (g/10))*m = (11/10)*g*m = (11/10)*(9.8 m/s²)*(60 Kg)
⇒ T = 646.8 N
then we use the equation
W = F*d = T*h = (646.8 N)*(17 m)
W = 10995.6 J
b) We use the formula
W = m*g*h ⇒ W = (60 Kg)(9.8 m/s²)(-17 m)
⇒ W = - 9996 J
c) We have to obtain Wnet as follows
Wnet = W₁ + W₂ = 10995.6 J - 9996 J
⇒ Wnet = 999.6 J
then we apply the equation
Wnet = ΔK = Kf - Ki = Kf - 0 = Kf
⇒ Kf = 999.6 J
d) Knowing that
K = 0.5*m*v² ⇒ v = √(2*Kf / m)
⇒ v = √(2*999.6 J / 60 Kg)
⇒ v = 5.77 m/s
Answer:
Explanation:
mass =60kg d = 17m a=g/10
(a) work done on the astronaut by the force from the helicopter = fd
but f =m(g+a)
w= m( g+g/10)d
wt = 11/10 mgd
w =11/10 * 60 *9.8 * 17 = 10995.6J = 1IKJ
(b) workdone by her weight = -mgh
= 60*9.8* 17 = -9996J
(C) Kinetic energy = wt + w
= (10995.6 - 9996)J = 999.6J
(d) Kinetic energy =1/2m[tex]v^{2}[/tex]
hence velocity = [tex]\sqrt{2ke/m}[/tex] = 5.777m/s
An air bubble has a volume of 1.70 cm³ when it is released by a submarine 115 m below the surface of a lake. What is the volume of the bubble when it reaches the surface? Assume the temperature and the number of air molecules in the bubble remain constant during its ascent.
Final answer:
The volume of the air bubble when it reaches the surface is 101.7 cm³.
Explanation:
To solve this problem, we can use Boyle's Law, which states that the volume of a gas is inversely proportional to its pressure, assuming the temperature and number of gas molecules remain constant.
Given that the air bubble is released at a depth of 115 m below the surface and the volume at that depth is 1.70 cm³, we need to find the volume at the surface.
Since the pressure at the surface is 1 atm, we can set up the following equation:
P1V1 = P2V2
Where P1 is the pressure at depth, V1 is the volume at depth, P2 is the pressure at the surface, and V2 is the volume at the surface.
Substituting the given values:
(6.01 × 107 Pa) × (1.70 × 10-6 m3) = (1 atm) × V2
Simplifying and solving for V2, we find:
V2 = (6.01 × 107 Pa × 1.70 × 10-6 m3) / (1 atm)
Converting to cm³, we get:
V2 = 101.7 cm³
Therefore, the volume of the air bubble when it reaches the surface is 101.7 cm³.
A bobsled, moving at 32 m/s, decelerates to 22 m/s at a rate of 4.8 m/s2. Determine the distance traveled by the bobsled during this time.
Answer:
56.25 m
Explanation:
Cinematics describes the variables involved in movement without dealing with its causes. There are four main concepts in cinematics: Velocity (or its scalar equivalent, the speed), acceleration, time and displacement (or its scalar equivalent, distance).
We know the bobsled starts at 32m/s and ends at 22m/s with acceleration [tex]-4.8m/sec^2[/tex]. The acceleration is negative because the bobsled is breaking of losing speed
The formula relating these three variables is
[tex]v_f^2=v_o^2+2ax[/tex]
Solving for x
[tex]x=\frac{v_f^2-v_o^2}{2a}[/tex]
[tex]x=-\frac{22^2-32^2}{2(-4.8)}[/tex]
[tex]x=\frac{540}{9.6}[/tex]
[tex]x=56.25\ m[/tex]
Help meeeeeeeeeeeeee! please show work! In a collision, Kara Less who was traveling at 11 m/s while texting in her 1300 kg car, is struck by another vehicle and finds herself and her phone suddenly moving 2.5 m/s in the opposite direction. What impulse does she experience?
Answer choices
-12,000
-14,000
-16,000
-18,000
The impulse experienced is -18,000 kg m/s
Explanation:
The impulse exerted on an object is equal to the change in momentum of the object. Mathematically:
[tex]I=\Delta p = m(v-u)[/tex]
where
m is the mass of the object
v is the final velocity of the object
u is the initial velocity
[tex]\Delta p[/tex] is the change in momentum
I is the impulse
In the collision in this problem,
m = 1300 kg is the mass of the car
u = 11 m/s is the initial velocity
v = -2.5 m/s is the final velocity (negative, since it is in the opposite direction)
Substituting, we find
[tex]I=(1300)(-2.5-11)=-17,550 kg m/s[/tex]
So the closest choice is
-18,000 kg m/s
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In caring for a 27-year-old male who has a large laceration on his anterior forearm, you have noticed that your pressure dressing has become
saturated with blood. Which of the following should you do next?
a.Remove the saturated dressings and apply a large trauma dressing.
b.Apply an ice pack over the original dressing.
c.Apply a tourniquet.
d.Apply additional dressing material over the top of the original dressing and bandage it in place.
Answer:
d.Apply additional dressing material over the top of the original dressing and bandage it in place.
Explanation:
Given that a man is having a major wound on his body that is why lot of blood is coming from his body that is why we have to cover that major wound by using some extra dressing material and have to bound that wound .
Attach extra dressing material and bandage it in place over the top of the original dressing.
Therefore the answer is "d"
An astronaut on the Venus attaches a small brass ball to a 1.00-m length of string and makes a simple pendulum. She times 20 complete swings in a time of 42.1 seconds. From this measurement she calculates the acceleration due to gravity on the Venus.
Express your answer to two significant figures and include the appropriate units.
Answer:
8.91 [tex]\frac{m}{sec^{2} }[/tex]
Explanation:
Given
length of pendulum=1mit takes 42.1 secs to complete 20 swings,⇒1 swing takes, T[tex]=\frac{42.1}{20}=2.105sec[/tex]We know the formula
[tex]g=4\times(pie)^{2}\times \frac{L}{T^{2} }[/tex]
Where
g is the gravitational force experienced by the pendulumT is the time period for on oscillationL length of pendulum[tex]g=4\times(pie)^{2} \times \frac{L}{T^{2}}[/tex]
[tex]g= 39.47842\times \frac{1}{2.105^{2} }[/tex]
[tex]g=8.91 \frac{m}{sec^{2} }sec[/tex]
The acceleration due to gravity on Venus is 0.6 m/s².
Explanation:To calculate the acceleration due to gravity on Venus, we can use the formula for the period of a simple pendulum:
T = 2π√(L/g)
Where T is the period of the pendulum, L is the length of the string, and g is the acceleration due to gravity.
Given that the period is 42.1 seconds and the length is 1.00 meter,To calculate the acceleration due to gravity on Venus, we can use the formula for the period of a simple pendulum: we can rearrange the formula to solve for g:
g = (4π²L)/T²
Plugging in the values, we get:
g = (4π²*1.00)/(42.1)² = 0.6 m/s²
Therefore, the acceleration due to gravity on Venus is 0.6 m/s².
A time-varying horizontal force F(t) = At4 + Bt2 acts for 0.500 s on a 12.25-kg object, starting at time . In the SI system, A has the numerical value 4.50 and B has the numerical value 8.75. (a) What are the SI units of A and B? (b) What impulse does this force impart to the object? 5) (a) A: N/s4 = kg • m/s6, B: N/s2 = kg • m/s4 (b) 12.9 N • s, horizontally
Answer:
Part a)
[tex]A = \frac{N}{s^4}[/tex]
[tex]B = \frac{N}{s^2}[/tex]
PART B)
[tex]I = 0.393 Ns[/tex]
Explanation:
PART A)
As we know that the force is given as
[tex]F = At^4 + B t^2[/tex]
here we know that each term of the equation must have same dimensions
so we will have
[tex]At^4 = N[/tex]
[tex]A = \frac{N}{s^4}[/tex]
similarly for other term
[tex]Bt^2 = N[/tex]
[tex]B = \frac{N}{s^2}[/tex]
PART B)
Impulse given by the force is given as
[tex]impulse = \int Fdt[/tex]
now we have
[tex]I = \int (At^4 + Bt^2)dt[/tex]
[tex]I = \int (4.50 t^4 + 8.75 t^2) dt[/tex]
[tex]I = \frac{4.50(0.5)^5}{5} + \frac{8.75(0.5)^3}{3}[/tex]
[tex]I = 0.028 + 0.36[/tex]
[tex]I = 0.393 Ns[/tex]
The SI units of the constants A and B are kg·m/s·6 and kg·m/s·4 respectively, essential for ensuring dimensional consistency in the force equation. The calculated impulse imparted to the object by this varying force over 0.500 s is 12.9 N·s.
The question asks two parts: (a) to determine the SI units of constants A and B in the equation F(t) = At4 + Bt2, and (b) to calculate the impulse imparted to the object by this force during 0.500 s. To address part (a), we recognize that force (F) has SI units of kg·m/s2, known as newtons (N). To ensure dimensional consistency, the units of A must be N/s4 = kg·m/s6, and the units of B must be N/s2 = kg·m/s4, as these adjustments yield a force measurement when applied to time (t) in seconds. For part (b), impulse, which is the integral of force over time, necessitates calculating the definite integral of F(t) from 0 to 0.500 s. Applying the specific values given for A and B, and after the integration process, the impulse imparted to the 12.25-kg object is found to be 12.9 N·s, horizontally.
Gas A has molecules with small mass. Gas B has molecules with larger mass. They are at the same temperature.
How do the gases compare with respect to the average translational kinetic energy?
a)A has a larger average kinetic energy.b)B has a larger average kinetic energy.c)The gases have the same average kinetic energy.
Answer:
c)The gases have the same average kinetic energy.
Explanation:
As we know that the kinetic energy of gas is given as
[tex]K = \frac{1}{2}mv^2[/tex]
here we know that
[tex]v = \sqrt{\frac{3RT}{M}}[/tex]
so we have
[tex]K = \frac{1}{2}m (\frac{3RT}{M})[/tex]
now we have
[tex]K = \frac{3}{2}n RT[/tex]
now mean kinetic energy per molecule is given as
[tex]K_{avg} = \frac{3}{2}KT[/tex]
so this is independent of the mass of the gas
so average kinetic energy will remain same for both the gas molecules
A steel sphere with radius 1.0010 cm at 41.0°C must slip through a brass ring that has an internal radius of 1.0000 cm at the same temperature. To what temperature must the brass ring be heated so that the sphere, still at 41.0°C, can just slip through? Coefficient of linear expansion α for brass is 19.0 × 10−6 K−1.
Answer:
[tex]\Delta T = 52.6 ^o C[/tex]
Explanation:
As we know that radius of the brass ring is given as
[tex]R_{brass} = 1.0000 cm[/tex]
radius of the sphere is given as
[tex]R_{sphere} = 1.0010 cm[/tex]
now by thermal expansion formula we know that
[tex]L = L_o(1 + \alpha \Delta T)[/tex]
so we will have
[tex]1.0010 = 1.0000(1 + (19\times 10^{-6})\Delta T)[/tex]
so we have
[tex]\Delta T = 52.6 ^o C[/tex]
The first confirmed detections of extrasolar planets occurred in ____________. The first confirmed detections of extrasolar planets occurred in ____________. the mid-17th century the mid-20th century the 1990s 2009
The first confirmed detections of extrasolar planets were made in the 1990s, with the first planet discovered orbiting a main-sequence star similar to our Sun detected in 1995.
Explanation:The first confirmed detections of extrasolar planets, or planets outside our own solar system, occurred in the 1990s. Before this time, the existence of such planets was believed, but had yet to be confirmed. The breakthrough came in 1992 when two planets were detected orbiting a pulsar, a type of neutron star. However, the first confirmed extrasolar planet orbiting a main-sequence star similar to our Sun, was discovered in 1995. This marked a significant event in the field of astronomy and has led to the discovery of thousands more extrasolar planets since.
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The first confirmed detections of extrasolar planets happened in the 1990s. The major breakthrough came in 1995, when astronomers discovered a planet orbiting the regular star 51 Pegasi, heralding a new era in the search for planets outside of our solar system.
Explanation:The first confirmed detections of extrasolar planets, or planets outside of our own solar system, occurred in the 1990s. Before this, while many astronomers and theorists speculated about the existence of planets around other stars, none had indeed been confirmed. This changed dramatically when in 1995, Didier Queloz and Michel Mayor of the Geneva Observatory discovered a planet around a regular star, 51 Pegasi. This pioneering discovery proved that our solar system was not alone in the universe, leading to the detection of thousands of extrasolar planets in the following decades. The detection techniques they proposed, specifically the Doppler and transit techniques, have enabled astronomers to observe the effects of planets on the stars they orbit without directly seeing the planets themselves.
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A gymnast of mass 51.00 kg is jumping on a trampoline. She jumps so that her feet reach a maximum height of 2.100 m above the trampoline and, when she lands, her feet stretch the trampoline down 61.00 cm. How far does the trampoline stretch when she stands on it at rest? [Hint: Assume the trampoline obeys Hooke's law when it is stretched.]
Answer:
[tex]x = 6.7 cm[/tex]
Explanation:
Here we can use energy conservation for two positions of the gymnast
When she is at the lowest position of the trampoline then its potential energy will convert into gravitational potential energy at the top
So we will have
[tex]\frac{1}{2}kx^2 = mg(H + x)[/tex]
so we have
[tex]\frac{1}{2}k(0.61^2) = 51 \times 9.81(2.1 + 0.61)[/tex]
[tex]k = 7287.5 [/tex]
now when she stands on it
then by force balance we will have
[tex]mg = kx[/tex]
[tex]51 \times 9.81 = 7287.5 \times x[/tex]
[tex]x = 6.7 cm[/tex]
Suppose a certain jet plane creates an intensity level of 124 dB at a distance of 5.01 m. What intensity level does it create on the ground directly underneath it when flying at an altitude of 2.25 km?
Answer:71 dB
Explanation:
Given
sound Level [tex]\beta _1=124 dB[/tex]
distance [tex]r_1=5.01 m[/tex]
From sound Intensity
[tex]\beta =10dB\log (\frac{I_1}{I_0})[/tex]
[tex]124=10dB\log (\frac{I_1}{I_0})[/tex]
[tex]12.4=\log (\frac{I_1}{I_0})[/tex]
[tex]I_1=(1\times 10^{-12})\times 10^{12.4}[/tex]
[tex]I_1=2.51 W/m^2[/tex]
we know Intensity [tex]I\propto ^\frac{1}{r^2}[/tex]
[tex]I_1r_1^2=I_2r_2^2[/tex]
[tex]I_2=I_1(\frac{r_1}{r_2})^2[/tex]
[tex]I_2=2.51\cdot (\frac{5.01}{2.25\times 10^3})^2[/tex]
[tex]I_2=1.24\times 10^{-5} W/m^2[/tex]
Sound level corresponding to [tex]I_2[/tex]
[tex]\beta _2=10\log (\frac{I_2}{I_0})[/tex]
[tex]\beta _2=10\log (\frac{1.24\times 10^{-5}}{1\times 10^{-12}})[/tex]
[tex]\beta _2=70.93\approx 71 dB[/tex]
The density of gasoline is 730 kg/m3 at 0°C. Its average coefficient of volume expansion is 9.60 10-4(°C)−1. Assume 1.00 gal of gasoline occupies 0.003 80 m3. How many extra kilograms of gasoline would you receive if you bought 8.50 gal of gasoline at 0°C rather than at 21.7°C from a pump that is not temperature compensated?
Answer: 0.4911 kg
Explanation:
We have the following data:
[tex]\rho_{0\°C}= 730 kg/m^{3}[/tex] is the density of gasoline at [tex]0\°C[/tex]
[tex]\beta=9.60(10)^{-4} \°C^{-1}[/tex] is the average coefficient of volume expansion
We need to find the extra kilograms of gasoline.
So, firstly we need to transform the volume of gasoline from gallons to [tex]m^{3}[/tex]:
[tex]V=8.50 gal \frac{0.00380 m^{3}}{1 gal}=0.0323 m^{3}[/tex] (1)
Knowing density is given by: [tex]\rho=\frac{m}{V}[/tex], we can find the mass [tex]m_{1}[/tex] of 8.50 gallons:
[tex]m_{1}=\rho_{0\°C}V[/tex]
[tex]m_{1}=(730 kg/m^{3})(0.0323 m^{3})=23.579 kg[/tex] (2)
Now, we have to calculate the factor [tex]f[/tex] by which the volume of gasoline is increased with the temperature, which is given by:
[tex]f=(1+\beta(T_{f}-T_{o}))[/tex] (3)
Where [tex]T_{o}=0\°C[/tex] is the initial temperature and [tex]T_{f}=21.7\°C[/tex] is the final temperature.
[tex]f=(1+9.60(10)^{-4} \°C^{-1}(21.7\°C-0\°C))[/tex] (4)
[tex]f=1.020832[/tex] (5)
With this, we can calculate the density of gasoline at [tex]21.7\°C[/tex]:
[tex]\rho_{21.7\°C}=730 kg/m^{3} f=(730 kg/m^{3})(1.020832)[/tex]
[tex]\rho_{21.7\°C}=745.207 kg/m^{3}[/tex] (6)
Now we can calculate the mass of gasoline at this temperature:
[tex]m_{2}=\rho_{21.7\°C}V[/tex] (7)
[tex]m_{2}=(745.207 kg/m^{3})(0.0323 m^{3})[/tex] (8)
[tex]m_{2}=24.070 kg[/tex] (9)
And finally calculate the mass difference [tex]\Delta m[/tex]:
[tex]\Delta m=m_{2}-m_{1}=24.070 kg-23.579 kg[/tex] (10)
[tex]\Delta m=0.4911 kg[/tex] (11) This is the extra mass of gasoline
Final answer:
To find the extra kilograms of gasoline received when buying at 0°C instead of 21.7°C, we can use the formula for volume expansion and the density of gasoline.
Explanation:
To find the extra kilograms of gasoline received when buying at 0°C instead of 21.7°C, we need to calculate the difference in volume and then convert it to kilograms using the density of gasoline. The average coefficient of volume expansion is given as 9.60 x 10^-4 (°C)^-1. We can calculate the change in volume using the formula ΔV = V₀ * β * ΔT, where ΔV is the change in volume, V₀ is the initial volume, β is the coefficient of volume expansion, and ΔT is the temperature difference in Celsius. In this case, the initial volume is 0.00380 m³ and the temperature difference is 21.7 - 0 = 21.7 °C. Substituting the values, we get ΔV = 0.00380 * 9.60 x 10^-4 * 21.7. Now, to convert the change in volume to kilograms, we multiply it by the density of gasoline, which is 730 kg/m³. So, the extra kilograms of gasoline received is ΔV * 730.
Two ladybugs sit on a rotating disk that is slowing down at a constant rate. The ladybugs are at rest with respect to the surface of the disk and do not slip. Ladybug 1 is halfway between ladybug 2 and the axis of rotation. How does the rotational speed of ladybug 1 compare to ladybug 2?
The two ladybugs have same rotational (angular) speed
Explanation:
The rotational (angular) speed of an object in circular motion is defined as:
[tex]\omega=\frac{\theta}{t}[/tex]
where
[tex]\theta[/tex] is the angular displacement
t is the time interval considered
Here we have two ladybugs, which are located at two different distances from the axis. In particular, ladybug 1 is halfway between ladybug 2 and the axis of rotation. However, since they rotate together with the disk, and the disk is a rigid body, every point of the disk cover the same angle [tex]\theta[/tex] in the same time [tex]t[/tex]: this means that every point along the disk has the same angular speed, and therefore the two ladybugs also have the same angular speed.
On the other hand, the linear speed of the two ladybugs is different, because it follows the equation:
[tex]v=\omega r[/tex]
where r is the distance from the axis: and since the two ladybugs are located at different [tex]r[/tex], they have different linear speed.
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The rotational speed of ladybug 1 is slower than that of ladybug 2.
When a rotating disk slows down at a constant rate, the angular velocity decreases over time. In this scenario, the ladybugs are at rest with respect to the surface of the disk, which means they are not experiencing any relative motion with respect to the disk.
Since ladybug 1 is halfway between ladybug 2 and the axis of rotation, it is closer to the center of the disk than ladybug 2. As the disk slows down, the distance from the axis of rotation to ladybug 1 decreases at a faster rate compared to the distance from the axis of rotation to ladybug 2.
As the distance from the axis of rotation decreases for ladybug 1 at a faster rate than for ladybug 2, ladybug 1 needs to decrease its rotational speed more to maintain the constant product of angular velocity and moment of inertia.
Thus, ladybug 1 has a slower rotational speed compared to ladybug 2.
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A 22 kg solid door is 220 cm tall, 91 cm wide. a) What is the door's moment of inertia for rotation about a vertical axis inside the door, 15 cm from one edge? b) What is the door's moment of inertia for rotation about a vertical axis inside the door, 15 cm from one edge?
Answer
given,
mass of the solid door = 22 Kg
dimension of door = 220 cm x 91 cm
moment of inertia about the hinge
[tex]I = \dfrac{1}{3}Mr^2[/tex]
r is the distance from the one edge which is equal to 91 cm or 0.91 m
[tex]I = \dfrac{1}{3}\times 22 \times 0.91^2[/tex]
[tex]I = 6.073\ kg m^2[/tex]
Moment of inertia about center for rectangular gate is equal to
[tex]I_{CM} = \dfrac{1}{12}Mr^2[/tex]
moment of inertia for rotation about a vertical axis inside the door, 15 cm from one edge
[tex]I = I_{CM} + MR^2[/tex]
[tex]I = I_{CM} + M(\dfrac{91}{2}- 15)^2[/tex]
[tex]I = \dfrac{1}{12}Mr^2+ M(0.0930)[/tex]
[tex]I = \dfrac{1}{12}\times 22 \times 0.91^2+ 22 \times (0.093)[/tex]
[tex]I = 3.56\ Kg m^2[/tex]
The question asks about the moment of inertia of a door with given dimensions, rotating about an axis 15 cm from one edge. The moment of inertia is calculated using the formula for a rectangular slab and then using the Parallel Axis Theorem, allowing for the axis to be moved from the center of mass to 15 cm from the edge.
Explanation:The question pertains to the computation of the moment of inertia of the door about a vertical axis inside the door, 15 cm from one edge twice. The moment of inertia regarding an axis can be deduced from the moment of inertia regarding a parallel axis that passes through the center of mass. The formula for the moment of inertia of a rectangular slab about an axis through its center and perpendicular to the slab is Icm = M(H² + W²)/12, where M is the door’s mass, H is the height, and W is the width.
For the calculation specifically 15 cm from the one edge, the Parallel Axis Theorem will need to be applied which declares I = Icm + MD², where D is the distance from the center of mass to the new axis, which considering this scenario is W/2 + 15 cm. After the computation of Icm and replacing the necessary values in, the moment of inertia for the both asked instances are procured.
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When a car drives along a "washboard" road, the regular bumps cause the wheels to oscillate on the springs. (What actually oscillates is each axle assembly, comprising the axle and its two wheels.) Find the speed of my car at which this oscillation resonates, given the following information:
(a) When four 80-kg men climb into my car, the body sinks by a couple of centimeters. Use this to estimate the spring constant k of each of the four springs.
(b) If an axle assembly (axle plus two wheels) has total mass 50 kg, what is the natural frequency of the assembly oscillating on its two springs?
(c) If the bumps on a road are 80 cm apart, at about what speed would these oscillations go into resonance?
Answer:
a) 40,000 N/m
b) f = 6.37 Hz
c) v = 4,8 m/s
Explanation:
part a)
First in order to estimate the spring constant k, we need to know the expression or formula to use in this case:
k = ΔF / Δx
Where:
ΔF: force that the men puts in the car, in this case, the weight.
Δx: the sinking of the car, which is 2 cm or 0.02 m.
With this data, and knowing that there are four mens, replace the data in the above formula:
W = 80 * 10 = 800 N
This is the weight for 1 man, so the 4 men together would be:
W = 800 * 4 = 3200 N
So, replacing this data in the formula:
k = 3200 / 0.02 = 160,000 N/m
This means that one spring will be:
k' = 160,000 / 4 = 40,000 N/m
b) An axle and two wheels has a mass of 50 kg, so we can assume they have a parallel connection to the car. If this is true, then:
k^n = 2k
To get the frequency, we need to know the angular speed of the car with the following expression:
wo = √k^n / M
M: mass of the wheel and axle, which is 50 kg
k = 40,000 N/m
Replacing the data:
wo = √2 * 40,000 / 50 = 40 rad/s
And the frequency:
f = wo/2π
f = 40 / 2π = 6.37 Hz
c) finally for the speed, we have the time and the distance, so:
V = x * t
The only way to hit bumps at this frequency, is covering the gaps of bumping, about 6 times per second so:
x: distance of 80 cm or 0.8 m
V = 0.8 * 6 =
V = 4.8 m/s
Final answer:
The speed at which these oscillations go into resonance is approximately 12.6 m/s.
Explanation:
(a) To estimate the spring constant k of each of the four springs, we can use Hooke's Law, which states that the force exerted by a spring is proportional to the displacement from its equilibrium position. Mathematically, this can be expressed as:
F = -k * x
where F is the force exerted by the spring, k is the spring constant, and x is the displacement from the equilibrium position.
When four 80-kg men climb into the car, the body sinks by a couple of centimeters. Let's assume this displacement is 2 cm (0.02 m). The force exerted by each spring can be calculated using the weight of the men and Hooke's Law:
F = -k * x
mg = -k * x
k = -mg / x
Substituting the given values, we get:
k = -(80 kg * 9.8 m/s^2) / 0.02 m
k ≈ -39200 N/m
Since the spring constant k is a positive value, we can take the magnitude of the spring constant as:
|k| = 39200 N/m
(b) The natural frequency of the axle assembly oscillating on its two springs can be calculated using the formula for the natural frequency of a simple harmonic oscillator:
f = (1 / (2 * pi)) * sqrt(k / m)
where f is the natural frequency, k is the spring constant, and m is the mass of the axle assembly.
Substituting the given values, we get:
f = (1 / (2 * pi)) * sqrt(39200 N/m / 50 kg)
f ≈ 7.89 Hz
(c) The speed at which these oscillations go into resonance can be calculated using the formula for the resonance frequency of a simple harmonic oscillator:
f_resonance = v / (2 * L)
where f_resonance is the resonance frequency, v is the speed of the car, and L is the distance between the bumps on the road.
Substituting the given values, we get:
7.89 Hz = v / (2 * 0.8 m)
v ≈ 12.6 m/s
So, the speed at which these oscillations go into resonance is approximately 12.6 m/s.
In a laundromat, during the spin-dry cycle of a washer, the rotating tub goes from rest to its maximum angular speed of 9.2 rev/s in 7.3 s. You lift the lid of the washer and notice that the tub decelerates and comes to a stop in 12.0 s. Assuming that the tub rotates with constant angular acceleration while it is starting and stopping, determine the total number of revolutions undergone by the tub during this entire time interval.
Answer:
90 revolutions
Explanation:
t = Time taken
[tex]\omega_f[/tex] = Final angular velocity
[tex]\omega_i[/tex] = Initial angular velocity
[tex]\alpha[/tex] = Angular acceleration
[tex]\theta[/tex] = Number of rotation
Equation of rotational motion
[tex]\omega_f=\omega_i+\alpha t\\\Rightarrow \alpha=\frac{\omega_f-\omega_i}{t}\\\Rightarrow \alpha=\frac{9.2-0}{7.3}\\\Rightarrow a=1.26027\ rev/s^2[/tex]
[tex]\omega_f^2-\omega_i^2=2\alpha \theta\\\Rightarrow \theta=\frac{\omega_f^2-\omega_i^2}{2\alpha}\\\Rightarrow \theta=\frac{9.2^2-0^2}{2\times 1.26027}\\\Rightarrow \theta=33.5801\ rev[/tex]
Number of revolutions in the 7.3 seconds is 33.5801
[tex]\omega_f=\omega_i+\alpha t\\\Rightarrow \alpha=\frac{\omega_f-\omega_i}{t}\\\Rightarrow \alpha=\frac{0-9.2}{12}\\\Rightarrow a=-0.76\ rev/s^2[/tex]
[tex]\omega_f^2-\omega_i^2=2\alpha \theta\\\Rightarrow \theta=\frac{\omega_f^2-\omega_i^2}{2\alpha}\\\Rightarrow \theta=\frac{0^2-9.2^2}{2\times -0.76}\\\Rightarrow \theta=55.68421\ rev[/tex]
Number of revolutions in the 12 seconds is 55.68421
Total total number of revolutions is 33.5801+55.68421 = 89.26431 = 90 revolutions
The washer undergoes an equivalent of approximately 75.36 revolutions during its start-stop cycle, assuming constant angular acceleration.
Explanation:The problem involves the concepts of angular speed and acceleration in physics. Firstly, convert the angular speed from rev/s to rad/s. 1 rev = 2π rad, so 9.2 rev/s = 57.96 rad/s. The angular acceleration for the washer starting is the change in angular speed over time, so (57.96 rad/s - 0 rad/s) / 7.3 s = 7.94 rad/s².
For the washer stopping, the acceleration is (0 rad/s - 57.96 rad/s) / 12.0 s = -4.83 rad/s².
To find total revolutions we use the equation θ = θ0 + ω0t + 0.5αt². θ0 and ω0 are zero since washer starts at rest. The total revolutions for the starting process: 0.5 * 7.94 rad/s² * (7.3 s)² = 212.45 rad = 33.79 rev. For the stopping process with similar computations get 41.57 rev. Hence, total revolutions = 33.79 rev + 41.57 rev = 75.36 rev.
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A car with a mass of 1.50 X 10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12.0 s. Assume that the force of resistance remains constant at 400.0 N during this time. what is the average power developed by the car's engine?
The average power is 20.3 kW
Explanation:
First of all, we calculate the work done on the car: the work-energy theorem states that the work done on the car is equal to the change in kinetic energy of the car, so we have
[tex]W=K_f - K_i = \frac{1}{2}mv^2-\frac{1}{2}mu^2[/tex]
where
W is the work done
[tex]K_i, K_f[/tex] are the initial and final kinetic energy of the car
[tex]m=1.50\cdot 10^3 kg = 1500 kg[/tex] is the mass of the car
u = 0 is the initial velocity
v = 18.0 m/s is the final velocity
Substituting,
[tex]W=\frac{1}{2}(1500)(18)^2=2.43\cdot 10^5 J[/tex]
Now we can find the average power developed by the car's engine, which is given by
[tex]P=\frac{W}{t}[/tex]
where
[tex]W=2.43\cdot 10^5 J[/tex] is the work done
t = 12.0 s is the time taken
Substituting,
[tex]P=\frac{2.43\cdot 10^5 J}{12.0}=20,250 W = 20.3 kW[/tex]
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As electrons are passed through the system of electron carriers associated with photosystem ii
Even though ____ welding is slower and requires a higher skill level as compared to other manual welding processes, it is still in demand because it can be used to make extremely high-quality welds in applications where weld integrity is critical.
a-OAWb-SMAWc-GMAWd-GTAW
Even though GTAW welding is slower and requires a higher skill level as compared to other manual welding processes, it is still in demand because it can be used to make extremely high-quality welds in applications where weld integrity is critical.
Answer: Option D
Explanation:
Among the various sorts of welding forms accessible today, gas tungsten bend welding, or GTAW is commonly viewed as the most moving welding technique to ace. In spite of the fact that it is additional challenging than other welding strategies, in any event, when drilled with the consideration of a specialist, the improved quality and nature of welds created with GTAW.
It can offer a pragmatic option in contrast to less complex welding techniques, especially for restricted segments of hardened steel and non-ferrous metals, for example, copper, aluminium, and magnesium combinations.
One of the principal modern applications for GTAW welding started inside the aeronautic trade. Current fields where GTAW abilities are most sought after incorporate the ship fitting exchange, as aluminium welding assumes a significant job in the development of a ship's superstructure, and the assembling and fix of bikes.