Conceptual Physics Rotational Motion

 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 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 fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s². What is its angular speed at the instant it goes through an angular displacement of 4.2 rad?

• 0.025 rad/s
• 0.11 rad/s
• 0.46 rad/s
• 1.2 rad/s

A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 7.0-s interval at a rate of 0.040 rad/s². What is its angular speed after this 7-s interval?

• 0.2 rad/s
• 0.3 rad/s
• 0.46 rad/s
• 0.78 rad/s

Which object listed below has the greatest momentum?

• A 0.05 kg object rolling at 0.2 m/s.
• A 0.15 kg object rolling at 2 m/s.
• A 0.15 kg object rolling at 1 m/s
• A 0.4 kg object rolling at 2 m/s.

Tags

NGSS.HS-PS2-2

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

Which travels faster?

• A rotating ball
• a non rotating ball
• a honey badger

Tags

NGSS.MS-PS3-1

A small mass is rotating without friction in a circle. The string is shortened by pulling it through the axis of rotation with no external torque. What happens to the tangential velocity?

• It increases
• It decreases
• It stays the same

Suppose you are rotating in a chair with 2 equal masses held in each outstretched hand and you drop them. What happens to your angular velocity?

• Increase
• Decrease
• Stays the same
• Is lost

Tags

NGSS.HS-PS2-2