Physics Review Energy, Momentum, and waves

A 30.00 kg mass falls from a height of 4.000 m. The momentum of the mass just before it hits the ground

• 144.2 kg m/s.

• 187.8 kg m/s.

• 320.0 kg m/s.

• 442.4 kg m/s.

• 502.1 kg m/s.

A 3.000 kg ball is pitched with a kinetic energy of 20.00 Joules. Then the momentum of the ball is

• 7.500 kg m/s.

• 8.350 kg m/s.

• 9.450 kg m/s.

• 10.95 kg m/s.

• 12.50 kg m/s.

If the momentum of a ball is doubled, then the kinetic energy is

• 0.5 times larger.

• 2 times larger.

• 3 times larger.

• 4 times larger.

• 5 times larger.

A 4.00 kg ball is traveling at 5.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s. The change in momentum of the ball is

• 8.0 kg m/s.

• 13 kg m/s.

• 26 kg m/s.

• 30 kg m/s.

• 36 kg m/s.

A machine gun fires 60.0 gram bullets at 6 bullets a second. If the velocity of the bullets is 600 m/s, then the average force on the machine gun is

• 67.0 N.

• 75.0 N.

• 94.0 N.

• 109 N.

• 216 N.

A 140 gm baseball with a velocity of 25.0 m/s is hit by a baseball bat and leaves at 30.0 m/s in the opposite direction. If the ball was in contact with the bat for 12.0 ms, what is the average force on the ball?

• 750 N

• 642 N

• 550 N

• 482 N

• 366 N

Momentum is the product of _________________ and velocity.

• weight

• mass

• diretion

Because it is a measure of two quantities, momentum is a ____________________.

• scalar

• vector

• both vector and scalar

Momentum is large when mass is large, when ___________ is large, or both are large.

• speed

• direction

• velocity

If an eagle and a bumble bee are both traveling at 10 km/hr, which has the greater momentum?

• eagle

• bumble bee

• both