Rotational Extra Practice

 2600 rev/min is equivalent to which of the following?

• 2600 rad/s 
• 43.3 rad/s 
• 273 rad/s
• 60 rad/s

A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?

• 3.2 rad/s
• 26 rad/s
• 52 rad/s
• 81 rad/s

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

A spool of thread has an average radius of 1.00 cm. If the spool contains 62.8 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers.

• 100
• 1000
• 3140
• 62800

A 0.30m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s² over a 5.0 s interval?

• 25 rad
• 12.5 rad
• 2 rad
• 0.5 rad

The number of complete revolutions per second is:

• frequency

• period

• torque

• rotational inertia

The time required for one complete revolution is:

• torque

• frequency

• period

• rotational kinetic energy

The drum of a washing machine rotates 1800 times in 3 minutes. What is the period?

• 0.1 s

• 0.2 s

• 0.3 s

• 0.5 s

Which represents the acceleration of the ball?

• A
• B
• C
• D

A ball on a string is travelling in circular motion. Which vector represents the centripetal force?

• The green vector because it points towards the center of the circular path
• The blue vector because it shows the direction of the object's inertia
• The green vector because it shows the path of the ball
• The blue vector because this is the way the ball will move when it is released.