Exam 7: Momentum and Collisions

A hockey puck with mass 0.250 kg traveling along a line at 2.5 m/s strikes a stationary puck with the same mass.One puck exits the elastic collision in a direction that is 20 degrees away from the line at a speed of 2.35 m/s.What is the speed of the second puck after the collision?

Which of the following have the highest ratio of kinetic energy to momentum,K/p?

A 300-g billiard ball travelling at 2 m/s collides elastically with an identical stationary billiard ball and bounces off at a 30 degree angle.What is the angle of the other ball's path with respect to the path of the original ball?

A 45-kg girl skating due south at 7 m/s collides with a 30-kg boy moving east at 5 m/s.Their common velocity in m/s is

A 120-g ball thrown at 25 m/s is struck by a bat which gives it a velocity of 30 m/s in the opposite direction.If the time of contact is 0.01 s,the magnitude of the average force experienced by the ball is

A hockey puck with a mass of 160 g slides at a speed of 12 m/s on frictionless ice.The puck runs into a small box with a mass of 850 g that is initially at rest.Assuming that the collision is elastic,what is the speed of the box after the collision?

A rolling steel ball bearing of mass 27.5 g collides elastically with a small toy car of mass 52.0 g.If after the collision,the car moves at 1.25 m/s to the right,with what direction and speed was the ball bearing rolling prior to the collision?

A 57-kg archer on ice skates launches a 32.4-g arrow traveling 65 m/s.If the archer is initially at rest and can recoil without friction,the speed of the archer after the arrow launch is

An SUV of mass 2200 kg,moving with a speed of 35 m/s on the highway,passes a car with the mass 1500 kg and a kinetic energy equal to that of the SUV.The ratio of the momentum of the car relative to that of the SUV is

Which of the following statements about collisions is true?

An object initially at rest explodes into three pieces,each of which has the same mass.Piece one moves north and piece two moves east.Which piece has the largest speed?

A hockey puck with a mass of 160 g slides at a speed of 12 m/s on frictionless ice.The puck runs into a small box with a mass of 850 g that is initially at rest.Assuming that the collision is elastic,what is the speed of the hockey puck after the collision?

Consider two carts,of masses m and 2m,at rest on a frictionless air track.If you push the first cart for 3 m and then the other for the same length of distance with the same force,which cart undergoes the largest change in momentum?

A golf ball of mass 0.0408 kg is dropped from a height h = 1.12 m onto a hard floor and bounces back to exactly that same height.What is the average force on the ball during the 0.012 s that it was in contact with the floor?

A truck moving with a speed of 25.4 m/s strikes a parked car.During the collision the truck and car stick together and slide to a stop together.The moving truck has a total mass of 2434 kg (including driver),and the parked car has a total mass of 1092.0 kg.The coefficient of sliding friction between the tires and the road is 0.520.How far does the truck/car combination slide? (in m)

Particle one of mass m initially moves to the right at v.Particle two of mass 2m is initially at rest.After they undergo an elastic collision,particle one moves directly down.What is the final speed of particle two?

A 49.5-g tennis ball traveling at 18.2 m/s is hit by a tennis racket which applies a force of 25.7 N to the ball for 16.3 ms.The impulse that the racket applies to the tennis ball is

Consider two carts,of masses m and 2m,at rest on a frictionless air track.If you push the first cart for 3 m and then the other for the same length of distance with the same force,which cart undergoes the smallest change in momentum?

In an elastic collision,

The sum of the forces acting on an object is equal to