Rotational Motion Quiz

A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?

• 9.6 rad/s/s
• 4.8 rad/s/s
• 3.1 rad/s/s
• 1.6 rad/s/s

For a rotating rigid body, which of the following statements is NOT correct?

• All points along a rotating rigid body move with constant speed
• Points along a rotating body have velocities that continuously change directions
• Points along a rotating body move through the same angle in equal time intervals
• All of the answers are correct

Determine the linear velocity of the tips of the blades in meters per second for a ceiling fan with 50 cm blades rotating at 45 rpm.

• 2.4 m/s

• 2300 m/s

• 8500 m/s

• 240 m/s

Which has more rotational inertia? (consider all objects have equal radius)

• Hollow sphere
• solid sphere
• cylindrical shell

• solid cylinder

Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

• the inside horse
• the outside horse
• Neither

In order to do a lot of flips an Olympic diver would want:

• A high rotational inertia
• A low rotational inertia
• A low linear acceleration
• A low angular velocity

What happens to his rotational inertia when a figure skater brings in his arms?

• Increase his rotational inertia
• Decrease his rotational inertia
• has no affect

Why are you more stable when riding a bicycle at a faster speed?

• You have more mass
• The wheels have angular momentum
• It's not easier to ride at a faster speed
• The bike has more momentum

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A cave dweller rotates a pebble in a sling with a radius of 0.30 m clockwise through an arc length of 0.96 m. What is the angular displacement of the pebble?

• 1.6 rad
• -1.6 rad
• 3.2 rad
• -3.2 rad

Does a bridge anchored resting on two pillars have any torque?

• No, it isn't moving
• Yes, but it is at equilibrium
• Yes, but it will soon break because of the torque
• No, Bridges can't have torque

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