1. This table shows the momentum for Karen, who was running when she bumped into James. After the collision, James' momentum is
Momentum before collision | Momentum after collision
K 35 units | 10 units
J 20 units | ?
A. 10 units
B. 35 units
C. 45 units
2. A baseball on a T-ball stand has no momentum until it is hit with a bat. When Tyler swings the bat, it has a momentum of 12 kg m/s. After the bat hits the ball, the ball has a momentum of 8 kg m/s. What is the momentum of the bat AFTER it hits the ball?
A. 0 kg m/s
B. 4 kg m/s
C. 8 kg m/s
3. A steel ball with a mass of 20.0 g is traveling at 5 m/s. It collides with a stationary steel ball with a mass of 35.0 g. If the collision is perfectly elastic, what is the speed of the second ball after the collision?
A. 3.6 m/s
B. 5.2 m/s
C. 8.2 m/s
4. In an elastic collision, the momentum is ______________ and the mechanical energy is ______________.
A. not conserved, conserved
B. conserved. conserved
C. conserved, not conserved
5. In all collisions, both elastic and inelastic, which quantity must be conserved?
A. velocity
B. kinetic energy
C. momentum
6. In a trial, an expert witness uses the conservation of momentum to demonstrate which initial velocities would give the final states that occurred in the accident. Can using the conservation of momentum be justified in this case?
A. Yes, because momentum is conserved in all collisions.
B. No, energy is always conserved, but momentum is only sometimes conserved.
C. No, momentum is only conserved in elastic collisions which this is not.
7. A student states that, as a roller coaster coasts down a hill, its momentum is conserved. Which is the best response to this statement?
A. Momentum is never conserved.
B. The momentum decreases as the coaster speeds up.
C. It is the energy that is conserved not momentum.
please help
2 answers