Answer:
[tex]\begin{array}{l|l}\text{Speed}\; \mathrm{(m\cdot s^{-1})} & \text{Minimum Height\;(m)}\\\cline{1-2}\\[-1em] 2 & 0.204\\3&0.459\\4 & 0.815\\5 & 1.27 \\6 & 1.83\end{array}[/tex].
Assumptions:
The object is dropped in a free fall.There's no air resistance.The downward acceleration due to gravity is [tex]\rm 9.81\;m\cdot s^{-2}[/tex]Explanation:
Consider the "SUVAT" equation
[tex]\displaystyle \frac{v^{2} - u^{2}}{2a} = x[/tex],
where
[tex]v[/tex] is the final velocity,[tex]u[/tex] is the initial velocity,[tex]a[/tex] is the acceleration of the object, and[tex]x[/tex] is the change in the object's position.For example, if the bottle needs to achieve a speed of [tex]v = \rm 2\; m\cdot s^{-1}[/tex] by the time it reaches the ground,
[tex]u = 0[/tex] since the statement that the bottle is "dropped" implies a free fall.[tex]a = g = \rm 9.81\;m\cdot s^{-2}[/tex].Apply the previous equation to find the minimum height, [tex]x[/tex]:
[tex]\displaystyle x = \frac{v^{2} - u^{2}}{2a} = \rm \frac{\left(2\; m\cdot s^{-1}\right)^{2}}{2\times 9.81\; m\cdot s^{-2}} \approx 0.204\; m[/tex].
Replace the [tex]v[/tex] value and apply the formula to find the minimum height required to reach different final speeds.
Answer:
0.20
0.46
0.82
1.28
1.84
Explanation:
To achieve a speed of 2,3,4,5,6 m/s, the bottle must be
6. On a quiet day, the atmospheric pressure results in a force of about 10,0000 N on a window pane with an area of 1 square meter. a. Why does this large force not shatter the window? b. How will this change if a strong wind is blowing across the window pane?
Explanation:
a. The same atmospheric pressure that's pushing the window from the outside is also pushing on the window from the inside. So the forces are balanced.
b. If a strong wind is blowing across the window pane, the pressure will drop, as described by the Bernoulli principle. So the pressure inside will be greater than the pressure outside, causing the window to bow out a little.
Final answer:
The large force applied by atmospheric pressure does not shatter a window because it is evenly distributed and balanced by internal pressures. A strong wind can change the pressure on the window by creating a differential. Air pressure is considerable but not damaging due to balance with internal body pressure.
Explanation:
Atmospheric Pressure and Its Effect
a) On a quiet day, the atmospheric pressure results in a force of about 100,000 N on a window pane with an area of 1 square meter. This large force does not shatter the window because the pressure is exerted evenly over the entire surface of the window and is balanced by internal pressures within the building.
b) If a strong wind is blowing across the window pane, the pressure on the window will change due to the wind's pressure differential causing a net force that could potentially cause damage if strong enough.
A particle of mass, m = 3.0kg movers with a uniform velocity, v = (5m/s)I +(3m/s)j. At the time, t, the particle passes through the point r = (2m)i - (3m)j from the origin. Calculate the magnitude and direction of the angular momentum about the origin at time t. (Angular momentum is given by L= mv x R
Answer:
The magnitude is 63 kg m²/s, and the direction is -k.
Explanation:
Plug the values into the equation:
L = m v×r
L = (3.0 kg) (<5 i + 3j> m/s × <2i − 3j> m)
Take the cross product. The cross product of two dimensional vectors is:
<v₁ i + v₂ j> × <r₁ i + r₂ j> = <(v₁ r₂ − v₂ r₁) k>
Therefore:
L = (3.0 kg) <((5)(-3) − (3)(2)) k m²/s>
L = (3.0 kg) <-21 k m²/s>
Multiply:
L = <-63 k kg m²/s>
The magnitude is 63 kg m²/s, and the direction is -k.
If the magnitude of the electrostatic force felt by a charge is three times that from another charge, but their charges are the same, then the electric field strength of this charge is _____ the strength of the other charge.
three times
nine times
one-third
one-ninth
Answer:
three times
Explanation:
F=Eq
3F=3Eq
Answer:
three times
Explanation:
The relation between the force and the electrostatic field is given by
F = q E
where, F be the force , q be the charge and E be the strength of electrostatic field.
Here the charge is q
F = q E .... (1)
Now the charge remains same but the force three times, let E' be the electrostatic field strength.
3F = q E' .... (2)
Divide equation (2) by equation (1)
E' / E = 3F / F
E' = 3 E
A trained sea lion slides from rest down a long
ramp into a pool of water. If the ramp is inclined at
an angle of 23° above the horizontal and the
coefficient of kinetic friction between the sea lion
and ramp is 0.26. Calculate the acceleration of the
sea lion as it slides down the ramp.
Answer:
1.5 m/s²
Explanation:
Draw a free body diagram. There are three forces acting on the sea lion: gravity pulling down, normal force perpendicular to the ramp, and friction parallel to the ramp.
Sum of the forces perpendicular to the incline:
∑F = ma
N − mg cos θ = 0
N = mg cos θ
Sum of the forces parallel to the incline:
∑F = ma
mg sin θ − Nμ = ma
Substitute for N:
mg sin θ − (mg cos θ) μ = ma
g sin θ − g cos θ μ = a
a = g (sin θ − μ cos θ)
Given θ = 23° and μ = 0.26:
a = 9.8 (sin 23 − 0.26 cos 23)
a = 1.48
Rounded to two significant figures, the sea lion accelerates at 1.5 m/s².
Given:
Coefficient of Kinetic energy = [tex]0.26[/tex]Angle = [tex]23^{\circ}[/tex]By using the Newton's second equation, we get
→ [tex]mgSin \Theta-F_k = ma[/tex]
or,
→ [tex]mgSin \Theta-\mu mg Cos \Theta =ma[/tex]
→ [tex]g Sin \Theta-\mu g Cos \Theta =a[/tex]
hence,
The acceleration will be:
→ [tex]a = 9.8 Sin 23^{\circ} - 0.26\times 9.8\times Cos23^{\circ}[/tex]
[tex]= 1.484 \ m/s^2[/tex]
Thus the above response is correct.
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What are two examples of goods and two examples of services
The goods and the services make up the basis of every economy. The goods can simply be defined as merchandise or possessions. The services can be defined as the actions through which help is provided, or work is done for someone else. Example of goods are the food and furniture, with the food being crucial for the survival of the people, while the furniture is an essential part of every home and its practicality and decor. Examples of services are teaching and car repairing. The teaching is crucial for the development of the societies, as through it the people get education, while the repairing of cars is very important as lot of people have them, can not afford to buy new ones all the time, and they need for their daily movement over longer distances.
Two bricks of the same mass are each on ledges. Brick 1 is 100 feet high and Brick 2 is 300 feet high. Brick 2 has:
1. zero times more potential energy
2. two times more potential energy
3. three times more potential energy
4. four times more potential energy
5. nine times more potential energy
Answer: 3 times more potential energy
Explanation:
Final answer:
Brick 2 has three times more gravitational potential energy than Brick 1, as it is three times higher and both bricks have the same mass. The potential energy is calculated using the formula GPE = mgh.
Explanation:
The question relates to the concept of gravitational potential energy (GPE), which is the energy an object possesses by virtue of its height above the ground and its mass. The formula to calculate GPE is GPE = mass x gravitational field strength (g) x height. For comparable masses, the only variable affecting the potential energy is height. Given that Brick 1 is at 100 feet and Brick 2 is at 300 feet, the potential energy is directly proportional to height since mass and gravitational acceleration are constant.
Therefore, Brick 2 has three times the potential energy of Brick 1 because it is at three times the height (300 feet compared to 100 feet). This relationship is captured by the formula GPE = mgh, where m is the mass, g is the acceleration due to gravity (assumed constant here), and h is the height.
QUESTION 3
When completing a scientific investigation, you will know your results are reliable when you are able to
duplicate your results
communicate your results
evaluate your results.
Answer:
duplicate your results
Explanation:
the results are reliable when you can duplicate the expirement and repeat the results without error.
Answer:
Duplicate your results.Explanation:
A scientific investigation refers to researches where we apply the scientific method, which is characterized by involving systematic observations, measurements, experimentation, analysis, system of hypothesis, and other elements.
Basically, when we have a hypothesis, we try to prove it developing a scientific investigation which must be defined with the relation between a dependent variable and an independent variable. So, through systematic observations, we study the relation between these variables, experimenting and analysing all results we get from those observations.
So, one important characteristic of scientific investigation is research reliability, which is the degree to which a research produces consistent results, and one ingredient to obtain that it's the posibility of reproducing the results, that is, duplicating them in other contexts. For example, if we study Newton's second law, you will be able to reproduce the results of such law in different contexts.
Therefore, the right answer is "duplicate your results".
The voltmeter reads 117 V and ammeter reads 0.13 A .If the resistance of ammeter and voltmeter are 9 kilo ohm and 0.015 ohm respectively ,find the value of R. 3marks
R = 899.985Ω.
The ammeter gives a lecture of I = 0.13A through the resistor and the voltmeter gives a lecture of V = 117V between the points a and c, the ammeter resistance is Ra = 0.015Ω. So, the voltmeter reading is the sum of the potential difference Vbc (through the ammeter) and Vab (through the resistor).
To obtain the voltage Vbc through the ammeter from its known current and resistance, Ohm's law is used.
Vbc = I*Ra = (0.13A)(0.015Ω) = 0.00195V
Vab = V - Vbc = 117V - 0.00195V = 116.99805V
We know that Vab = I*R. Clear R from the equation:
R = Vab/I = 116.99805V/0.13A = 899.985Ω
What must a magnet always have?
Answer:
Every magnet has both a North and a South pole. When you place the North pole of one magnet near the South pole of another magnet, they are attracted to one another. When you place like poles of two magnets near each other (North to North or South to South), they will repel each other.
Answer:
All magnets, regardless of their shape or application, must have two poles, the north pole (N) and the south pole (S), which are called magnetic poles.
Explanation:
Magnets are ferromagnetic materials that have the property of attracting or repelling other magnets. In addition, it is characteristic for materials of this nature (ferromagnetic) to be strongly magnetized in the presence of a magnetic field.
All magnets, regardless of their shape or application, must have two poles, the north pole (N) and the south pole (S), which are called magnetic poles. Another important characteristic of magnets is the inseparability of the magnetic poles, that is, it is not possible to find a magnet with only the north pole or only with the south pole. Thus, when a magnet is broken, it will give rise to two new magnets and the polarity of these new magnets will depend on the way in which it partitioned.
Why can gases and liquids both transmit heat by convection?
A. Their particles are free to move away from each other.
B. They both have fixed volume.
C. They both contain charged particles.
D. Their particles both vibrate around fixed positions.
Answer:
A. Their particles are free to move away from each other.
Explanation:
Answer:
Gases and liquids both transmit heat by convection because their particles are free to move away from each other (option A).
Explanation:
Convection is a process in which heat is transferred between two liquid substances, between two gaseous substances or a gas and a liquid when they are at different temperatures. The heat flux is produced from the body with the highest temperature to the substance with the lowest temperature.
The transmission of heat by convection is based on the actual movement of the molecules of a substance. Both liquids and gases are considered fluids where their particles are free to move away and move from each other. In solids particles vibrate around fixed positions and have a fixed volume .
Gases and liquids both transmit heat by convection because their particles are free to move away from each other (option A).
What is one reason that writing clear step-by-step procedures is important?
A. It prevents you from faking results.
B. It makes repetition and replication easier.
C. It makes sure that no one copies your work.
D. It prevents anything from going wrong during the experiment.
Answer:
D. It prevents anything from going wrong during the experiment.
Explanation:
One reason that writing clear step-by-step procedures is important because it prevents anything from going wrong during the experiment.
10. A worker covers a distance of 40 km from his house to his place of
work, and 10 km towards his house back. Then the displacement
covered by the worker in the whole trip is
The displacement covered by the worker in the whole trip is 30km.
The easiest way to solve this problem is using the displacement equation:
Δx = x₂ - x₁
A worker covers a distance of 40 km from his house to his place of
work, and 10 km towards his house back. So:
Δx = x₂ - x₁ = 40km - 10km = 30km
Since displacement is a vector quantity, the displacement of the worker from the data is 30Km.
What is displacement?Displacement refers to distance covered in a specific direction. Hence, unlike distance, we include direction in our discussion of displacement.
As such, displacement is a vector quantity therefore, the displacement of the worker is obtained from 40 Km - 10 Km = 30Km.
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a weight lifter performed 200 J of work lifting a weight in 2 seconds. what was his power
Answer:
100 Watts
Explanation:
Power is work per time.
P = W / t
P = 200 J / 2 s
P = 100 W
Answer: 100 Watts
Explanation:
During an experiment, you take a measurement of 3.5 inches. What is this
measurement in centimeters? 1 in = 2.54 cm.
A. 3.5 cm
B. 8.89 cm
C. 1.38 cm
D. 12.5 cm
The conversion of 3.5 inches to centimeters using the conversion rate of 1 inch equals 2.54 cm results in a value of 8.89 cm.
Explanation:To convert the measurement from inches to centimeters, we need to use the conversion rate given in the question, i.e., 1 inch equals 2.54 centimeters. In this case, since we have a measurement of 3.5 inches, we multiply 3.5 by 2.54 to find the measurement in centimetres.
So, 3.5 inches * 2.54 cm/inch = 8.89 cm. Therefore, the measurement of 3.5 inches in centimeters is equal to 8.89 cm which corresponds to option B.
So option B.8.89 cm is the correct answer.
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Which agency helps with disaster response
Answer:
AMURT
Explanation:
BUT THERE ARE MANY OTHERS LIKE THE AMERICAN RED CROSS ETC
Answer: Mercy corps
answered this on another dudes comment thread but still, give me brainliest please!
how far does a car go in 30 seconds at a speed of 29 m/s?
Answer:
870 metres
Explanation:
Speed = Distance/Time
Distance = Speed x Time
Distance = 29 x 30
= 870 metres
what is change in internal energy if 30j of heat are released from a system that does 50j of work on its surroundings
Answer:
-80 J
Explanation:
The first law of thermodynamics states that:
[tex]\Delta U = Q - W[/tex]
where
[tex]\Delta U[/tex] is the change in internal energy of the system
Q is the heat absorbed by the system
W is the work done by the system
In this problem, we have:
Q = -30 J is the heat released by the system (negative because the system releases it)
W = +50 J is the work done by the system on the surrounding (positive since it is done by the system)
Therefore, the change in internal energy is
[tex]\Delta U = -30 J - (+50 J) = -80 J[/tex]
Answer: -80 J
Explanation:
Type the correct answer in the box. Use numerals instead of words.
input force:
52N
input forcen
output force: 156 N
The mechanical advantage shown in the image is
Answer:
3
Explanation:
The mechanical advantage is the ratio of the output force to the input force.
MA = 156 / 52
MA = 3
The mechanical advantage in the scenario provided, where the input force is 52N and the output force is 156N, is calculated to be 3.
Explanation:The mechanical advantage of a simple machine tells us how many times the input force is multiplied by the machine. To calculate the mechanical advantage (MA), you divide the output force by the input force. Given an input force of 52N and an output force of 156N, the mechanical advantage would be calculated as MA = Output Force / Input Force = 156N / 52N = 3.
Choose the letter of the answer that best completes
the statement or answers the question.
1. If a vehicle increases its speed from 20 mph to 60
mph, its braking distance will increase by
a. 3 times.
b. 4 times
c. 9 times.
d. 40 times.
Answer:
The answer is:
c) 9 times
Explanation:
20/60= 3 x 3=9
Electrostatic charges are created by _____.
stripping outer electrons from substances
running electric current through a substance
stripping protons from the nucleus of a substance
running a substance through a magnetic field
Answer:
Electrostatic charges are created by stripping outer electrons from substances - first choice.
You have 13.0 gallons of gasoline. How many liters is this? (1 gallon equals
about 3.79 L.)
Answer:
I believe the answer is C
Explanation:
For this case we must make a conversion, we have as data that:
1 gallon is equivalent to 3.79 liters
By making a rule of three we have:
1 gallon ------------> 3.79 L
13 gallons --------> x
Where "x" represents the equivalent in liters:
[tex]x = \frac {13 * 3.79} {1}\\x = 49.27[/tex]
So, we have 49.27 liters of gasoline.
Answer:
Option C
Which factors affect gravitational force? Check all that apply.
composition of the objects
distance between the objects
masses of the objects
volume of the objects
weights of the objects
Intro
Done
Answer:
distance between the objects
masses of the objects
Explanation:
Gravitational force is a force of attraction that pulls two objects with masses together.
To best understand the concept of gravitational force, newton's law of universal gravitation provides a good insight. The law states that "every object in the universe attracts each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distances between them".
From the law, we see that gravitational force is dependent on the masses of the object and their distances.
Answer:
B. distance between the objects
C. masses of the objects
A 60 kg bungee jumper jumps from a bridge. She is tied to a bungee cord that is 15 m long
when unstretched and falls a total distance of 31 m. Calculate
(i) the spring constant of the bungee cord.
(ii) the maximum acceleration experienced by the jumper
Answer:
(i) 140 N/m
(ii) 28 m/s²
Explanation:
(i)
At the top of the jump, the bungee jumper has gravitational potential energy.
At the bottom of the jump, the bungee jumper has elastic potential energy.
mgh = ½ kx²
(60 kg) (9.8 m/s²) (31 m) = ½ k (31 m − 15 m)²
k = 140 N/m
(ii)
At the bottom of the jump:
∑F = ma
kx - mg = ma
(140 N/m) (31 m − 15 m) − (60 kg) (9.8 m/s²) = (60 kg) a
a = 28 m/s²
The spring constant of the bungee cord is approximately found to be 36.75 N/m, and the maximum acceleration experienced by the jumper is approximately 7.6 m/s^2.
Explanation:To answer the first part of your question: (i) the spring constant of the bungee cord, we will use Hooke's law which states: F = kx. Here, 'F' is the force, 'k' is the spring constant, and 'x' is the distance stretched. Because the bungee jumper is in free fall, the force acting on her is equal to her weight, so F = m*g = 60kg * 9.8m/s^2 = 588N. The distance stretched would be the total distance fallen minus the original length of the cord, so x = 31m - 15m = 16m. Hence, the spring constant k = F/x = 588N / 16m = 36.75 N/m.
For the second part: (ii) the maximum acceleration experienced by the jumper, when the jumper is at the bottom of the fall, the potential energy has completely converted to elastic potential energy. Thus, .5*k*x^2 = m*g*h. Substituting the found values of k and h (total distance), you can solve for the acceleration, which is approximately 7.6 m/s^2.
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the period and freqency of a wave are inversely related true or false
Answer: false
Explanation: the longer the period, the less thef= frequency
Answer:
True
Explanation:
As frequency increases, period decreases, and vice versa.
For more information please comment below and I'll respond as soon as possible.
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Which of the following is true of semiconductors?
A. Exposing a crystal of a semiconductor to heat or light starts displacing valence electrons, which then move throughout the crystal.
B. A material is classified as a semiconductor if its resistance to the flow of electric current is too low to permit it to be called a conductor.
C. Neither free electrons nor holes are considered charge carriers in a semiconductor.
D. Gold and silver are important semiconductors
Answer:
A. Exposing a crystal of a semiconductor to heat or light starts displacing valence electrons, which then move throughout the crystal.
Explanation:
A semiconductor has several properties, the main two are:
1. Under no special treatment and polarization conditions, there can't be current flow through it due to the high resistance.
2. The semiconductor material can have special change in its structure (excess of electron or holes), to be conductive under certain polarization situations.
Final answer:
The correct answer is A, as semiconductors conduct electricity when valence electrons are displaced by heat or light, and these electrons move throughout the crystal. The other options are incorrect; semiconductors are not classified by low resistance, both free electrons and holes are charge carriers in semiconductors, and gold and silver are conductors, not semiconductors.
Explanation:
The correct answer to which of the following is true of semiconductors is A. Exposing a crystal of a semiconductor to heat or light starts displacing valence electrons, which then move throughout the crystal. Semiconductors like silicon have a filled valence band and an unfilled conduction band, with a relatively small energy gap between the two. When moderate amounts of energy, such as heat or light, are provided, electrons can move from the valence band to the conduction band, becoming free to move throughout the crystal and thereby conduct electricity.
Option B is incorrect because semiconductors are not classified by their low resistance, but by their ability to conduct electricity under certain conditions, such as temperature or doping with impurities. Option C is not true, as both free electrons and holes act as charge carriers in a semiconductor. Lastly, option D is incorrect because gold and silver are conductors, not semiconductors. They are known for their excellent ability to conduct electricity due to their many free electrons.
Semiconductors' unique properties are utilized extensively in the creation of integrated circuits (IC) and other electronics, including diodes and transistors that are fundamental to modern technology.
Which type of modulation is applied to radio-controlled toys?
Answer:
Pulse modulation
Explanation:
Remote control toys use the radiations that lie in the range of infrared for their working. The frequency of these infrared radiations is 36-46 kilo Hertz.
The signals we give to the toys through remote control are actually given in the form of bits of data which are then modulated with the any desired carrier frequency. Therefore, the data we are sending is in the form of pulses and the pulses' duration determines that whether the signal will be read as OFF (0) or ON (1). This modulation is pulse modulation which is an effective method to lower the power value delivered by a signal by cutting the signal into smaller parts.
Similarly there are some other kinds of modulations used in some other purposes like frequency and amplitude modulation for signals transmission video and music.
Hope it helps!
Answer:
pulse
Explanation:
How much momentum will a dumb-bell of mass 10 kg transfer
to the floor if it falls from a height of 80 cm? Take its downward
acceleration to be 10 m s–2 .
We want to find how much momentum the dumbbell has at the moment it strikes the floor. Let's use this kinematics equation:
Vf² = Vi² + 2ad
Vf is the final velocity of the dumbbell, Vi is its initial velocity, a is its acceleration, and d is the height of its fall.
Given values:
Vi = 0m/s (dumbbell starts falling from rest)
a = 10m/s² (we'll treat downward motion as positive, this doesn't affect the result as long as we keep this in mind)
d = 80×10⁻²m
Plug in the values and solve for Vf:
Vf² = 2(10)(80×10⁻²)
Vf = ±4m/s
Reject the negative root.
Vf = 4m/s
The momentum of the dumbbell is given by:
p = mv
p is its momentum, m is its mass, and v is its velocity.
Given values:
m = 10kg
v = 4m/s (from previous calculation)
Plug in the values and solve for p:
p = 10(4)
p = 40kg×m/s
By using the equations of motion and momentum, it can be determined that a 10 kg d.umbbell falling from a height of 80 cm will transfer 40 kg m/s of momentum to the floor.
Explanation:The subject of this question is Physics, particularly dealing with the concept of momentum. To find out how much momentum a d.umbbell will transfer to the floor, we first need to calculate its velocity right before it hits the ground. This can be calculated using the equation of motion: v² = u² + 2gh, where u (initial velocity) is 0 (because it starts from rest), g (gravity) is 10 m/s², and h (height) is 0.8m (80cm).
Using the given values in the equation, the velocity v comes out to be √(2*10*0.8) = √16 = 4 m/s. The momentum is then calculated using the formula p=mv, where p represents momentum, m is mass, and v is velocity. Substituting the mass (10 kg) and the velocity (4 m/s), we find out that the momentum transferred to the floor is 40 kg m/s. Therefore, a d.umbbell of mass 10 kg falling from a height of 80 cm transfers 40 kg m/s momentum to the floor.
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HOW Tar does a car go in 30 seconds at a speed of 29 m/s? (the equation for
distance is d = st.)
A. 1.03 m
B. 900 m
C. 59 m
D. 870 m
Answer:B
Explanation:it’s the answer
QUESTION 6
One important way to adapt to diverse cultures is to
form a social group by choosing others who are most like you
stay quiet if you witness prejudice or hate in action
avoid studying languages you do not already speak
look past external characteristics and get to know more about people
QUESTION 7
Stress does not tend to be high among college students.
True
False
Answer: 1. look past external characteristics and get to know more about people
2. False
Explanation:
1. The learning the past external characteristics and get to know about people who belong to diverse culture and their contribution for the overall society, region, state and nation is likely to bring the spirit of brotherhood. This will raise the feeling of unity and will help in adapting diverse culture.
2. The students of college are likely to get stress due to increase in complexity in studies. Some students also participate in extra-curricular activities along with studies which makes their schedule hectic and tiring this bring stress to their lives.
The following diagram shows resistors in a circuit.
Answer:
The following diagram shows resistors in a series circuit.