Physics Answers

If X = Y – Z, which diagram best represents the vector Z?

A force of 5 N to is required to compress an industrial spring by 0.0001 meters, how much force

is required to compress this spring by 0.0003 meters?

A muscle builder holds the ends of a massless rope. At the center of the rope,

a 15-kg ball is hung as shown. What is the tension in the rope if the angle θ in the drawing is 4.5° from the horizontal?

A 15.0-kg load of bricks hangs from one end of an inextensible rope that passes

over a small, frictionless pulley. A 28.0-kg counterweight is suspended from the

other end of the rope. The system is released from rest. What is the magnitude of

the acceleration of the system? What is the tension acting on the rope?

A gas in an insulated cylinder with a movable piston is compressed adiabatically and 100J of work is done in the process. The gas is then allowed to expand adiabatically while doing 10J of work. What is the net change in internal energy?

A 25-centavo coin is dropped from the top of a 5.0-m high building. 20.0 seconds later, a 10-peso coin is dropped from the same point where the first coin was dropped. After how many seconds will it take the 10-peso coin to hit the ground?

a ball is projected horizontally from the top of a vertical building 25m above the ground level with an initial velocity of 8.25m/s.

a. how long is the ball in flight before hiiting the ground

b. how far from the building does the ball strike the ground

. A ball is failing form a height of 20m, with what velocity does it touch the ground?

At what altitude must a military plane flying horizontally at 1.75m/s be in order to deliver relief goods to typhoon yolanda survivors? The survivors are in an evacuation center 1750m away from where the plane is.

1. In bench pressing 100 kg, a weight lifter applies a 1040 N force to the bottom of the bar.