Physics Quiz on Rotational Motion

How many revolutions (rev) equal 270°?

• 2 rev

• 1.3 rev

• 0.75 rev

• 1 rev

A remote-controlled car's wheel accelerates at 22.4 rad/s2. If the wheel begins with an angular speed of 10.8 rad/s, what is the wheel's angular speed after exactly three full turns?

• 13 rad/s

• 31 rad/s

• 36 rad/s

• 63 rad/s

A bicyclist rides along a circular track. If the bicyclist travels around exactly half the track in 20 s, what is his average angular speed?

• 0.314 rad/s

• 0.61 rad/s

• 0.157 rad/s

• 31 rad/s

Calculate the unknown value in the corresponding table:

• 1.294 rad/s

• 2.2 rad/s

• 29 rad/s

• 15 rad/s

Find the angular acceleration of a ball swung at a constant angular speed of 5 rad/s on a rope that is 0.5 m long.

• 1 rad/s2

• 0 rad/s2

• 2.5 rad/s2

• 12.5 rad/s2

The distance between center two billiard balls of same masses is 0.3 m, if the magnitude of the gravitational force between them is 9.05 ×10-11 N what is the mass of one of those balls? [ G = 6.673×10-11 N. m2 / kg2 ]

• 0.8 kg

• 0.35 kg

• 0.45 kg

• 0.75 kg

Because of Earth's rotation:

• the weight of the body at the equator is less than the weight of the body at the poles.

• the weight of the body at the equator is greater than the weight of the body at the poles.

• the weight of the body at the equator is equal to the weight of the body at the poles.

• the mass of the body at the equator is less than the mass of the body at the poles.

The arm of a crane at a construction site is 12 m long, and it makes an angle of 60° with the horizontal. Assume that the maximum load the crane can handle is limited by the amount of torque the load produces around the base of the arm. What is the magnitude of the maximum torque the crane can withstand if the maximum load the crane can handle is 300 N?

• 1800 N . m

• 3118 N . m

• 900 N . m

• 3200 N . m

Which rotational quantity is equivalent to force in transitional motion?

• rotational kinetic energy (KErot )

• angular momentum (𝐿)

• moment of inertia (𝐼)

• torque (𝜏)

The tendency of a body rotating about a fixed axis to resist a change in rotational motion:

• torque (𝜏)

• angular momentum (𝐿)

• moment of inertia (𝐼)

• angular acceleration (𝛼)