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5/32 MCQs for:

Linear Momentum

A 50-kg pitching machine (excluding the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligible friction.)

0.28 m/s.

4.4 x 103 m/s.

0.70 m/s.

0.14 m/s.

The area under the curve on a Force versus time (F vs. t) graph represents:

Impulse.

Work.

Momentum.

Kinetic energy.

Two objects collide and stick together. Kinetic energy:

Is conserved only if the environment is frictionless.

Is conserved only if the collision is elastic.

Is definitely not conserved.

Is definitely conserved.

A 0.060-kg tennis ball, initially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the ball?

0.72 kgm/s.

1.1 kgm/s.

0.36 kgm/s.

1.8 kgm/s.

Two identical 1500-kg cars are moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the total momentum of the system?

4.4 x104 kgm/s at 590 N of E.

4.4 x 104 kgm/s at 310 N of E.

6.0 x 104 kgm/s at 310 N of E.

6.0 x 104 kgm/s at 590 N of E.