PA chapter 1

A skater is standing still on a frictionless ice rink. Her friend throws a Frisbee straight at her. In which of the following cases is the largest momentum transferred to the skater? A The skater catches the Frisbee momentarily, but then drops it vertically downward. B The skater catches the Frisbee, holds it momentarily, and throws it back to her friend. C The skater catches the Frisbee and holds onto it.

B

Two identical ice hockey pucks, labeled A and B, are sliding toward each other at speed v. Which one of the following statements is true concerning their momenta and kinetic energies? A Pa = -Pb & KEa = -KEb B Pa= -Pb & KEa =KEb C Pa = Pb & KEa = KEb D Pa = Pb & KEa = -KEb

B

A boy standing at one end of a floating raft that is stationary relative to the shore walks to the opposite end of the raft, away from the shore. As a consequence, the raft does which of the following? A remains stationary B moves away from the shore C moves toward the shore

C

A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initial angular position and a final angular position of the rigid body. Which of the sets can occur only if the rigid body rotates through more than 180°? A -1 rad, 1rad B 3 rad, 6 rad C 1 rad, 5 rad

C

A car and a large truck traveling at the same speed collide head-on and stick together. Which vehicle experiences the larger change in the magnitude of its momentum? A the truck B the car C impossible to determine D the change in magnitude of momentum is the same for both

D