Mechanics | Relativity Answers

A golf ball is hit from 4.3 m above a golfing fairway with an initial velocity of 30.0 m/s at an angle of 35° above the horizontal.

As the Earth travels around the Sun the Moon is traveling around the Earth. Find the MAXIMUM speed of the Moon (relative to the Sun) as it travels around the Sun. The Earth’s orbital radius around the Sun is 1.5 X 1011 m and the Moon’s orbit has a radius of 3.85 X 108. The time for the Earth’s journey around the Sun is 3.156 X 107 s and the Moon takes 2.36 X 106 s to travel around the Earth.

laws of motion describes?
1)relationship of body,force,motion in response
2)relationship of body and force
3)relationship of force and motion
4) relationship of body and motion in response
explain the answer

The angular momentum of a flywheel having a rotational inertia of 0.125 kgm2decreasesfrom 3.0 to 2.0 kgm2/s in a period of 1.5 s. (a) What is the average torque acting on the flywheelduring this period? (b) Assuming a uniform angular acceleration, through how many revolutions will the flywheel have turned? (c) How much work was done on the wheel? (d) What was theaverage power supplied by the flywheel?

A person is trying to run away up a slippery hill. The only thing limiting her acceleration is friction. If the hill is (d) meters long and she is starting from standing at the bottom, how much time will it take her to get to the top? Find time in terms of coefficient of friction (u), the angle of the hill (theta), length of the hill (d) and (g).

An object has a momentum of 32.0 kg m/sec in the positive X direction. A force in the negative X direction is applied for 1.3 seconds and the object stops.
a) What is the magnitude of the Force?
b) If the mass of the object is 4.00 kg, what is the initial kinetic energy?
c) What is the Impulse applied to the object to cause it to stop?
d) What is the final momentum of the object?
e) What is the final kinetic energy of the object?

A 3 kilogram mass is travelling at 15 meters per second when friction begins to decelerate it to stop in 5 seconds. What is the magnitude of the force of friction?

1. You are trying to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200-N.
a. What are the coefficients of static and kinetic friction?
b. Based on your answer in e, which is greater – coefficient of kinetic friction or coefficient of static friction?
c. Is it easier to start the crate moving or to keep the crate moving? Explain.

1. You are trying to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200-N.
a. Draw a free-body diagram for crate just before it starts to move.
b. What forces are acting on the crate just before it starts to move?

1. A ball is hanging from a long string that is tied to the ceiling of a train car travelling castward on horizontal tracks. An observer inside the train car sees the ball hang motionless. Draw a clearly labelled free-body diagram for the ball if (a) the train has a uniform velocity, and (b) the train is speed up uniformly. Is the net force on the ball zero in either case? Explain.