Answer:
The bob of simple pendulum has its maximum kinetic energy at mean position.
Explanation:
A simple pendulum is a device which consists of mass m hanging from the string of length L attached to the some point.When displaced and released its swings back and forth with periodic motion.
The simple pendulum swings from the mean position to the extreme position and back to mean position and again the extreme position on the other side completing one oscillation.
The velocity varies with oscillation.
The velocity of bob in the extreme position is zero.
The velocity of pendulum is maximum at the mean position and hence has maximum kinetic energy because K.E =0.5 mv².
The law of conservation of energy helps us to understand it .
The height of the bob is at least when it is in the mean position, so when we move to the extreme position on the right side it is at slightly raised height and all its energy is potential energy as it is slightly motionless.As kinetic energy is zero the velocity is zero.
At mean position all energy is kinetic and velocity is maximum.
The bob of a simple pendulum has its maximum kinetic energy at the bottommost position of its swing. This is because as the pendulum swings down, potential energy is converted into kinetic energy, reaching maximum speed and maximum kinetic energy at the bottom.
Explanation:The bob of a simple pendulum has its maximum kinetic energy at the bottommost position of its swing. This is because kinetic energy is associated with the motion of the bob. When the pendulum is at its highest point (at each end of the swing), it momentarily stops and thus has no kinetic energy - instead, there's potential energy. When it falls down and reaches the bottom of its swing, or the mean position, all the potential energy is converted into kinetic energy, achieving maximum speed and thus maximum kinetic energy.
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Fig. 9.1
(i) On Fig. 9.1, mark the north and south poles of the magnet, using the letters N and S.
[2]
(ii) A small piece of unmagnetised iron is placed at A.
What, if anything, happens to it?
(iii)
A small piece of positively charged plastic is placed at B.
What, if anything, happens to it?
Answer:
Okay let say from the diagram you have more force come in from the B point of the magnet and release out from A point of the magnet. so lets say north is always the attractive spot and south is your releasing spot.
Explanation:
meaning from magnet the north pole attracts objects and the south pole repeal object.
find the rate of positive acceleration of an automobile which went from a complete stop to a velocity of 30 meters per second in 10 seconds
Answer:
3 m/s^2
Explanation:
acceleration= Change in velocity/time
= 30-0 / 10
= 30/10
=3 m/s^2
What is the main difference between the intertidal zone and the neritic zone?
Answer:
the amount of time covered by water or C
Answer:
the amount of time covered by water
Explanation:
I just finished the quiz on ED
A4 kg bowling ball begins rolling down a at bowling alloy at 6 m/s . When it strikes the pins, it is estimated to be moving at 5 m/s . How much onergy is lost due to friction?
Answer:
Energy lost due to friction is 22 J
Explanation:
Mass of the ball m = 4 kg
Initially velocity of ball v = 6 m/sec
So kinetic energy of the ball [tex]KE=\frac{1}{2}mv^2[/tex]
[tex]KE=\frac{1}{2}\times 4\times 6^2=72J[/tex]
Now due to friction velocity decreases to 5 m/sec
Kinetic energy become
[tex]KE=\frac{1}{2}\times 4\times 5^2=50J[/tex]
Therefore energy lost due to friction = 72 -50 = 22 J
Final answer:
The energy lost due to friction as a 4 kg bowling ball slows down from 6 m/s to 5 m/s is 22 Joules. This is calculated using the difference between the initial and final kinetic energies.
Explanation:
The subject of this question is Physics, and it pertains to the High School level. The student is looking to understand the energy lost due to friction as a 4 kg bowling ball slows down from 6 m/s to 5 m/s. To calculate the energy lost, we use the kinetic energy formula:
Kinetic Energy (KE) = 1/2 m v^2
We calculate the initial and final kinetic energies and find the difference:
Initial KE = 1/2 (4 kg) (6 m/s)^2 = 72 JoulesFinal KE = 1/2 (4 kg) (5 m/s)^2 = 50 JoulesThe energy lost due to friction is the difference between the initial and final kinetic energies:
Energy lost = Initial KE - Final KE = 72 Joules - 50 Joules = 22 JoulesWhat happens to a flexible container of gas when it is heated
Answer:
There is an increase in volume of the container, because it is a flexible container and he no fixed volume.
Explanation:
Because of the application of temperature , the molecules tends to expand and will try to free up.
Because the container the fas is inside is flexible, it will amount to increase in volume.
V1/T1= V2/T2
Showing the connection between volume and temperature.
Which equation is used to calculate the electric potential in an electric field from a point charge? V = kq over d squared V = kq over d V =delta U over q V = delta U over E
Answer:
The answer is V =delta U over q
Explanation:
Electric potential is defined as the magnitude of the electric field through the potential energy that a charge would have if placed at that point. Mathematically, the potential is defined with the following expression:
[tex]V=\frac{E_{p} }{q}[/tex]
where:
V is the electric potential. Its unit is Julius by Coulomb (J/C).
Ep is the electric potential energy that has a charge
q is the charge
In the question Ep = ΔU
Answer:
The answer is V=kq/d
Explanation:
The electrostatic potential is defined in terms of work done in taking a unit positive charge from infinity to the point in question.
V=kq/d
Where d= distance from infinity to the point in question
k= constant of proportionality
q= attracting charge
The electric potential is measured in volts
1.Two skaters, Evelyn and Lily, face each other on near frictionless ice. Evelyn has a mass of 57.4 kg, and Lily has a mass of 48.3 kg. Both are motionless until they push away with a force of 33 N. Then Evelyn has a velocity of 1.4 m/s. What is Lily's velocity
Answer:
-1.67 m/s
Explanation:
We can solve this problem by using the law of conservation of momentum: in fact, since the system is isolated (no external forces, since the ice is frictionless), the total momentum of Evelyin and Lily must be conserved.
The total momentum before is zero, since they are both at rest:
[tex]p_i = 0[/tex]
The total momentum after is:
[tex]p_f = mv+MV[/tex]
where
m = 48.3 kg is Lily's mass
M = 57.4 kg is Evelyin's mass
V = 1.4 m/s is Evelyn's velocity
v is the Lily's velocity
Since momentum is conserved,
[tex]p_i=p_f[/tex]
And so
[tex]0=mv+MV[/tex]
Solving for v, we find Lily's velocity:
[tex]v=-\frac{MV}{m}=-\frac{(57.4)(1.4)}{48.3}=-1.67 m/s[/tex]
And the negative sign indicates that her direction is opposite to Evelyn's direction.
A metal rod A and a metal sphere B, on insulating stands, touch each other. They are originally neutral. A positively charged rod is brought near (but not touching) the far end of A. While the charged rod is still close, A and B are separated. The charged rod is then withdrawn. Is the sphere then positively charged, negatively charged, or neutral?
Answer:
The sphere is positively charged
Explanation:
This is because when the positively charged rod is brought near the metal rod A, the electrons in metal rod A and sphere B are attracted towards it into metal rod A while the positive charges in the are repelled into sphere B. So, when the charged rod is withdrawn, and metal rod A and sphere B are separated, metal rod A is now negatively charged, but sphere B is positively charged.
So, sphere B is positively charged.
Final answer:
After the process of charging by induction and separation while a positively charged rod is nearby, sphere B ends up being positively charged due to a deficit of electrons.
Explanation:
The question revolves around the concept of charging by induction, a fundamental concept in electrostatics within physics. In this situation, a metal rod A and a metal sphere B, both initially neutral and on insulating stands, are in contact. A positively charged rod is brought near rod A, causing electrons in the metal rod and sphere to be attracted towards the end closest to the charged rod. This leaves the portion of rod A farthest from the charged rod, and sphere B, positively charged due to the deficit of electrons.
When A and B are separated while the charged rod is still nearby, this separation of charges is maintained: rod A will retain a surplus of electrons (negatively charged) near the side of the positively charged rod, and sphere B will be left positively charged due to a deficit of electrons. Once the positively charged rod is removed, both objects retain their induction-caused charges. Therefore, sphere B ends up being positively charged.
A light ray hits a plane surface at 20 degrees. What is the angle between the incident and reflected rays.
Answer:
140°
Explanation:
The law of reflection states that the angle of redlection equals to the angle of incidence.
When light rays hit surface at 20°, they also leave the surface at the same angle
Since the whole surface has 180° then subtracting these two angles from total angle gives the the angle between the incident and reflected rays.
180°-20°-20°=140°
The angle of incidence and reflection are equal hence 140/2=70°
The question needed the angle between the incident and reflected rays which is already calculated as 140°
How do you find the volume of a rock
Answer:
You put the rock in a graduated cylinder and measure how many milliliters it goes up.
Explanation:
3. Force = _____ x _____?
Answer:
Explanation:
Force = mass * acceleration.
Sunspots change in number and location during the solar cycle. This phenomenon is connected to
Answer:
Continuously changing magnetic field of the Sun
Explanation:
The Sun is made up of plasma and is not solid like our planet. When it rotates the whole of the Sun doesn't rotate with same speed. The equatorial part completes the rotation in just 25 days whereas the poles do it in 35 days. Due to this the magnetic field lines entangle and reorganize them regularly.
The places where the field line exit and enter the surface of the Sun, temperature drops by around 1000 K thus these spots appear black in color and are known as Sun spots.
The magnetic field is not permanent as it will keep changing due to differential rotation. This will result in the change in the no. of location of Sun spots.
If we track the no. of sunspots visible with respect to years we will notice that they follow a cycle of 10.6 years. This is known as Solar cycle in which there comes a solar minima when we see very few sunspots. When it is solar maxima we can see more than 100 sunspots.
A colour tv draws 1.5 when connected to a 120-V outlet.What is the power rating of the tv set?
Answer:
180 watt
Explanation:
P = V x I
= 1.5 x 120
= 180 Watt
Light striking a metal plate can eject electrons from the plate's surface (this is called the photoelectric effect). Imagine that we place the plate in a vacuum and set up an electric field in the plate's vicinity that is uniform in magnitude and direction such that the electric field vector E at any point near the plate has a magnitude of 1000 N/C and points directly away from the plate, perpendicular to its surface. Electrons ejected by the photoelectric effect will have initial kinetic energies of no more than about 3 eV, where 1 eV = 1.6 x 10^-19 J. Roughly estimate the maximum distance that an ejected electron can get from the plate under these circumstances. (Hint: Consider an analogy to the behavoir of a thrown ball in a uniform gravitational field.)
Answer: The kinetic energy in physics can be defined as the energy possessed by the body when it is in motion relatively to the other bodies. This energy depends on the mass of the body and the square of the velocity. Its measurable unit is in Joules.
Answer and Explanation:
Given data:
The electric field is
E
=
1000
N
/
C
The initial kinetic energy of the ejected electrons is
k
=
3
e
V
=
(
3
×
1.6
×
10
−
19
)
J
The expression for the conservation of energy of the electrons is given by
k
=
U
p
k
=
e
V
Here
U
p
=
e
V
is the potential energy of the electron
Here
V
=
E
d
is the electric potential in electric field
Here
e
=
1.6
×
10
−
19
C
is the charge of the electon
Substituting the values in the above equation as,
k
=
q
V
k
=
e
(
E
d
)
(
3
×
1.6
×
10
−
19
J
)
=
(
1.6
×
10
−
19
C
)
(
1000
N
/
C
)
×
d
d
=
0.003
m
d
=
3
m
m
Explanation:
How is the reaction quotient used to determine whether a system is at equilibrium?
The reaction quotient (Q) is used to determine whether a system is at equilibrium by comparing it to the equilibrium constant (K).
The reaction quotient (Q) is used to determine whether a system is at equilibrium by comparing it to the equilibrium constant (K).
Here's how the reaction quotient is used to assess the system's status:
1. If Q = K, the system is at equilibrium. This means that the concentrations of the reactants and products in the system are such that the forward and reverse reactions occur at the same rate.
2. If Q < K, the system is not at equilibrium and will shift to the right to reach equilibrium. This indicates that the concentrations of the products are lower than what is required for equilibrium, so the forward reaction will be favored.
3. If Q > K, the system is not at equilibrium and will shift to the left to reach equilibrium. This suggests that the concentrations of the products are higher than what is needed for equilibrium, so the reverse reaction will be favored.
By comparing the reaction quotient (Q) to the equilibrium constant (K), we can determine whether a system is at equilibrium, and if not, in which direction the reaction will proceed to establish equilibrium.
Three thermometers are in the same water bath. After thermal equilibrium is established, it is found that the Celsius thermometer reads 100°C, the Fahrenheit thermometer reads 212°F the Kelvin thermometer reads 273 K. Which one of the following statements is the most reasonable conclusion? a. The Kelvin thermometer is incorrect. b. The Celsius thermometer is incorrect. c. All three thermometers are incorrect. d. The three thermometers are at different temperatures. e. The Fahrenheit thermometer is incorrect.
Answer:
OPTION A, Kelvin Thermometer is Incorrect
Explanation:
Now, if you consider best two out of three results, then celsius and Fahrenheit thermometers read the same value, meaning both are right.
1) K = °C + 273
K = 100°C + 273
k = 373°C
Kelvin Thermometer is Incorrect
2) [tex]C = \frac{F - 32}{1.8}[/tex]
when we have 212°F
[tex]C = \frac{212 - 32}{1.8} \\\\= 100^\circ C[/tex]
which is correct
An electrical short cuts off all power to a submersible diving vehicle when it is a distance of 29 m below the surface of the ocean. The crew must push out a hatch of area 0.950 m2 and weight 390 N to escape.
If the pressure inside is 1.0atm, what downward force must they exert on the hatch to open it?
Answer:
277983.465 N
Explanation:
[tex]\rho[/tex] = Density of seawater = [tex]1030\ kg/m^3[/tex]
g = Acceleration due to gravity = 9.81 m/s²
h = Depth = 29 m
w = Force = 390 N
A = Area = [tex]0.95\ m^2[/tex]
Force in the system would be
[tex]F=(\rho gh)A-w\\\Rightarrow F=(1030\times 9.81\times 29)\times 0.95-390\\\Rightarrow F=277983.465\ N[/tex]
The downward force must they exert on the hatch to open it is 277983.465 N
Brainly, can you please help me?
Answer:
yes
Explanation:
Answer:
with what
Explanation:
A 1000 kg car traveling 20 m/s east experiences an impulse of 2000 Ns west. What is the final velocity of the car after the impulse has been applied?
Answer:
V=18 m/s
Explanation:
Impulse is represented by Δp. It can be expanded such as: Δp = m(v-u) , where m is mass, v is final velocity, and u is initial velocity. (sorry ib physics things)
You can substitute your given values into the equation.
Δp = -2000 (i kept this as negative since it is going the opposite direction to your initial velocity)
m = 1000 kg
u = 20 m/s
1. -2000 = 1000(v-20) --> -2000/1000
2. -2 = v-20 --> -2 + 20
3. v = 18 m/s
You can always double check your answer by substituting it back into the original equation to make sure the Δp = -2000
What is zero uniform velocity motion
Answer:
A: In an observer's reference frame, motion lacking uniform velocity includes motion at constant or variable speed in a circle; and motion of a reciprocating device. Supposing the zero refers to the “uniform velocity” rather than the motion removes the possibility of an object at rest.
Explanation:
The half-life of caffeine is 5 hours. If you ingested a 30 oz Big Gulp, how many oz of caffeine is left after one half life? * Your answer
Answer:
The amount of caffeine left after one half life of 5 hours is 15 oz.
Explanation:
Half life is the time taken for a radioactive substance to degenerate or decay to half of its original size.
The half life of caffeine is 5 hours. So ingesting a 30 oz, this would be reduced to half of its size after the first 5 hours.
So that:
After one half life of 5 hours, the value of caffeine that would be left is;
[tex]\frac{30}{2}[/tex] = 15 oz
The amount of caffeine left after one half life of 5 hours is 15 oz.
What factors determine the electrostatic force between two objects?
Answer:
The electrostatic force between two objects depends on two factors.
The first factor is the charge, if the charge of the two objects is large then the magnitude of the electrostatic force between them will also be large.
The second factor is the distance, if the distance between the charge is less the magnitude of electrostatic force will be large vice versa.
We can say that the electrostatic force is directly proportional to charge and inversely proportional to the separation between the charge.
You wish to lift a 12,000 lb stone by a vertical distance of 15 ft. Unfortunately, you can only generate a maximum pushing force of 2,000 lb. What is the amount of work you must input in order to move the stone
Answer:
5,760,000 lb-ft²/s²
Explanation:
Work done, W = mgy where m = mass of stone = 12,000 lb, g = 32 ft/s² and y = vertical distance = 15 ft.
So, W = mgy = 12,000 lb × 32 ft/s² × 15 ft. = 5,760,000 lb-ft²/s²
The earth is warmed by solar energy how is this energy transferred from the sun to the earth
Answer:
Energy is transferred from the Sun to the Earth through radiation. As water is heated by the sun, it evaporates. The water vapor then condenses and forms clouds in the atmosphere.
Explanation:
When the Sun's energy moves through space, it reaches Earth's atmosphere and finally the surface. This radiant solar energy warms the atmosphere and becomes heat energy. This heat energy is transferred throughout the planet's systems in three ways: by radiation, conduction, and convection.
The energy transferred from the sun to the earth in the form of electromagnetic radiation. This radiant energy warms earth.
What is radiation?Radiation can be described as the energy that moves from one place to another in a form that can be defined as waves or particles.
There is a wide range of electromagnetic radiation from which visible light is one example.
Radiation with the highest energy like ultraviolet radiation, X-rays, and gamma rays. X-rays and gamma rays exhibit a lot of energy.
When radiations interact with atoms, they remove electrons and cause the atom to become ionized. Radiation can be transferred heat energy through space by electromagnetic radiation.
Most of the radiations that comes to the earth from the sun are invisible. Only a small part comes as visible light because light is composed of waves of different frequencies. Therefore, electromagnetic radiations coming from the sun warm the earth.
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With an average speed of 67m/s, how long does it take a falcon to dive to the ground
along a 150m path?
Answer:
approx 2.23 seconds
Explanation:
150/67
s=d/t and t=d/s
A jet transport has a weight of 2.25 x 106 N and is at rest on the runway. The two rear wheels are 16.0 m behind the front wheel, and the plane's center of gravity is 10.6 m behind the front wheel. Determine the normal force exerted by the ground on (a) the front wheel and on (b) each of the two rear wheels.
Answer:
Explanation:
Given that,
Weight of jet
W = 2.25 × 10^6 N
It is at rest on the run way.
Two rear wheels are 16m behind the front wheel
Center of gravity of plane 10.6m behind the front wheel
A. Normal force entered on the ground by front wheel.
Taking moment about the the about the real wheel.
Check attachment for better understanding
So,
Clock wise moment = anti-clockwise moment
W × 5.4 = N × 16
2.25 × 10^6 × 5.4 = 16•N
N = 2.25 × 10^6 × 5.4 / 16
N = 7.594 × 10^5 N
B. Normal force on each of the rear two wheels.
Using the second principle of equilibrium body.
Let the rear wheel normal be Nr and note, the are two real wheels, then, there will be two normal forces
ΣFy = 0
Nr + Nr + N — W = 0
2•Nr = W—N
2•Nr = 2.25 × 10^6 — 7.594 × 10^5
2•Nr = 1.491 × 10^6
Nr = 1.491 × 10^6 / 2
Nr = 7.453 × 10^5 N
Final answer:
The normal force exerted by the ground on the front wheel is 3.42 x 10^6 N. The normal force exerted by the ground on each of the two rear wheels is 4.02 x 10^5 N.
Explanation:
To determine the normal force exerted by the ground on the front wheel, we need to consider the torque balance. The torque exerted by the weight of the aircraft is equal to the torque exerted by the normal force. Since the weight acts at the center of gravity and the normal force acts at the front wheel, the torque equation becomes: (2.25 x 10^6 N)(10.6 m) = N(front wheel)(16.0 m). Solving for N(front wheel), we find that it is 3.42 x 10^6 N.
To determine the normal force exerted by the ground on each of the two rear wheels, we can use the fact that the sum of all the vertical forces should be equal to the weight of the aircraft. So, N(front wheel) + 2N(rear wheels) = 2.25 x 10^6 N. Substituting the value of N(front wheel) we found earlier, we can solve for N(rear wheels), which is 4.02 x 10^5 N for each rear wheel.
How does temperature affect the density of a material. ?
Help ASAP please also I can’t use an explanation from google...
Answer:
Explanation:
Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. ... Hot water is less dense and will float on room-temperature water. Cold water is more dense and will sink in room-temperature water.
Andrea asked her brother to take a 4 ft floating raft out of the water near the wave-swept shore. Using this raft as a measuring tool, she estimated that the wavelengths of these particular ocean waves were about 11 ft.
How fast are these surface ocean waves if the frequency remains 16 Hz?
Answer in units of ft/s.
Answer:
176ft/s
Explanation:
Speed of a wave is a function of the frequency and wavelength of the wave. It is expressed mathematically as:
V = fλ where:
V is the speed of the wave
f is the frequency
λ is the wavelength
Given f = 16Hz, λ = 11ft
V = 16×11
V = 176ft/s
What generates the magnetic field that surrounds a wire carrying an electric current?
Answer:
A,B,E
Explanation:
Magnetic fields are produced by moving electric charges.
What is an electromagnet?
Electromagnet is a temporary magnet. It is made by winding wire around an iron core. As current flows in the coil the iron becomes a magnet, and when the current is turned off it looses it's magnetic properties.
Magnetic fields are produced by moving electric charges.
Everything around us is made up of atoms, and each atom has a nucleus made of neutrons and protons with electrons that orbit around the nucleus. The orbiting electrons are tiny moving charges. A small magnetic field is created around each atom.
Magnetic fields produced from charges, similarly to electric fields, but are different in that the charges must be moving.
Long straight wire carrying a current is the example of a moving charge that generates a magnetic field.
Therefore,
Moving electric charges produced magnetic field.
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_______ is a liquid that absorbs and releases thermal energy.
Answer:
Refrigerator is a liquid or substance that absorbs and releases thermal energy.Explanation:
Refrigerator creates liquid by increasing the pressure of the refrigerator vapor inside and forcing them outside the refrigerator into the coils.This is the process which leads to the conversion of the hot gas in the refrigerator coils into liquid form.The liquid form of the refrigerator subsequently absorbs the heat that is created inside the refrigerator thereby cooling the air inside and releasing thermal energy in the process.