Physics B Final Review

Potential energy is the energy an object has because of its

• density.

• size

• location

• speed

• temperature

Old Faithful geyser in Yellowstone National Park shoots water every hour to a height of 40.0 m. With what velocity does the water leave the ground? (Disregard air resistance. g = 9.81 m/s2.)

• 7.00 m/s

• 19.8 m/s

• 14.0 m/s

• 28.0 m/s

A 4.0-kg ball has a momentum of 20.0-kg·m/s. What is the ball's speed?

• 20.0 m/s

• 80.0 m/s

• 0.2 m/s

• 5.0 m/s

• no of the above

A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small because the

• impulse on the cannon is less than the impulse on the cannonball.

• cannon has far more mass than the cannonball.

• momentum of the cannon is unchanged.

• force against the cannon is relatively small.

• none of these

The momentum change of an object is equal to the

• impulse acting on it.

• object's mass times the force acting on it.

• velocity change of the object.

• force acting on it times its velocity.

• force acting on it.

The reason padded dashboards are used in cars is that they

• decrease the momentum of a collision.

• look nice and feel good.

• increase the force of impact in a collision.

• increase the time of impact in a collision.

• decrease the impulse in a collision.

A 90 kg man is standing still on frictionless ice. His friend tosses him a 10 kg ball, which has a horizontal velocity of 20 m/s. After catching the ball, what is the man's velocity?

• 0 m/s

• 1.8 m/s

• 2 m/s

• 4.5 m/s

• 20 m/s

Waves transfer __________ but not ___________.

• matter, energy

• sound, light

• energy, matter

• light, sound

How many waves are in this wave train?

• 8

• 7.5

• 8.5

• 9

Which of the following is NOT a transverse wave?

• light

• radio wave

• sound

• all of these

• none of these