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Question :
6. The dimensional equivalence of the quantity "momentum" in terms : 2102133

6. The dimensional equivalence of the quantity "momentum" in terms of the fundamental quantities (mass, length, time) is:

A. MLT^{-1}.

B. ML^{2}T^{-2}.

C. MLT.

D. MLT^{-2}.

7. Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 3.5 m/s. What is the change in the magnitude of the ball's momentum?

A. 0.09 kg?m/s

B. 1.5 kg?m/s

C. 4.3 kg?m/s

D. 126 kg?m/s

8. Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball?

A. 60 N

B. 133 N

C. 3.0 N

D. 3.5 N

9. A crane drops a 0.30 kg steel ball onto a steel plate. The ball's speeds just before impact and after are 4.5 m/s and 4.2 m/s, respectively. If the ball is in contact with the plate for 0.030 s, what is the magnitude of the average force that the ball exerts on the plate during impact?

A. 87 N

B. 133 N

C. 3.0 N

D. 3.5 N

10. Jerome pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s. What is the magnitude of change in the ball's momentum?

A. 4.0 kg?m/s

B. 8.0 kg?m/s

C. 18 kg?m/s

D. 20 kg?m/s