Module 6 Quizzes Flashcards
What is the speed of a 624g basketball that has momentum with magnitude 5.85 kg x m/s?
A. 9.38 m/s
B. 0.009 m/s
C. 0.938 m/s
D. 107 m/s
A
A 130 g grapefruit is dropped from a tall building. What is the magnitude of its momentum after 2.00 s if we neglect air resistance? [Hint: this involves a chapter 2 concept. Remember the momentum is a vector.]
A. 1.18 kg x m/s
B. 2.35 kg x m/s
C. 2.78 kg x m/s
D. 3,44 kg x m/s
B
Just before bouncy ball hits a wall, it is traveling parallel to the ground at 18 m/s, and it then bounces directly backward at 17 m/s. The interaction time with the wall was 0.40 ms (4.0 x 10 ^ -4s). If the ball’s mass is 0.17 kg, what is the average magnitude of the force of the wall on the ball during their interaction?
A. 7700 N
B. 0 N
C. 7200 N
D. 15000 N
D
A 1.20 kg water balloon will break if it experiences more than 530 N of force. Your ‘friend’ whips the water balloon toward you at 13.0 m/s. The maximum force you apply in catching the water balloon is twice the average force. How long must the interaction time of your catch be to make sure the water balloon doesn’t soak you?
A. 0.032 s
B. 0.064 s
C. 0.078 s
D. 0.059 s
D
A 7400 kg truck traveling along a straight road at 14 m/s comes to a stop and remains stationary for several minutes. It then accelerates backward in reverse until it reaches 5.0 m/s in the opposite direction. What is the magnitude of the change in momentum of the truck for this entire process?
A. 100,000 kg x m/s
B. 140, 000 kg x m/s
C. 67,000 kg x m/s
D. 37,000 kg x m/s
B
A 72 kg swimmer dives horizontally off a raft floating in a lake. the diver’s speed immediately after leaving the raft is 3.8 m/s. If the time interval of the interaction between the diver and the raft is 0.25 s, what is the magnitude of the average horizontal force by the diver on the raft?
A. 270 N
B. 68 N
C. 2300 N
D. 1100 N
D
Suppose the mass of the raft in the previous problem is 500 kg. What is the raft’s speed immediately after the 72 kg diver jumps off at 3.8 m/s?
A. 0.00 m/s
B. 0.27 m/s
C. 0.55 m/s
D. 3,8 m/s
C
A 0.02 kg air hockey puck is traveling along with an essentially frictionless air hockey table at 4.0 m/s when it hits a 0.30 kg air hockey striker, which is initially at rest. If they stick together after the collision and continue along the same direction as the puck’s initial path, what is the magnitude of their velocity after the collision?
A. 4.0 m/s
B. 0.08 m/s
C. 0.25 m/s
D. 2.4 m/s
C
A car of mass m traveling at speed v to the right collides inelastically with a truck of mass 3m traveling at speed v/3 to the left as shown. Which best describes the center of mass of this system before and after the collision?
(Image on quiz)
A. the center of mass has a velocity to the right before and after the collision.
B. The center of mass has a velocity to the left before and after the collision.
C. The center of mass changes velocity direction due to the collision.
D. The center of mass has zero velocity before and after the collision.
D
In a perfect elastic collision, which of the following are conserved?
A. Momentum only
B. Kinetic energy only
C. Both momentum and kinetic energy
D. Kinetic energy nd potential energy
C
