Pre AP Physics Rotational Motion

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

• 3.2 rad/s

• 26 rad/s

• 52.12 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

• 1.63 rad/s/s

Which has greater angular velocity, 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 - they both have the same angular speed

• I don't know

Which would have a greater tangential velocity?

• Kid near the center of the merry go round

• Kid near the outside of the merry go round

• neither

• Both kids have same tangential velocity

A radian is all of the following EXCEPT

• A dimensionless quantity

• The ratio of arc length over radius

• The same as degrees

• It's an angle

An object completes 1.5 circular orbits in half a minute. What is its approximate angular velocity?

• 0.05 rad/s

• 0.31 rad/s

• 0.5 rad/s

• 3 rad/s

Tags

NGSS.HS-ESS1-4

If the answer to your calculation has units of rad/s², what type of quantity could it be?

• linear acceleration

• angular acceleration

• angular velocity

• angular momentum

As you are leaving a building, the door opens outward. If the hinges on the door are on your right, what is the direction of the angular velocity of the door as you open it?

• Up

• Down

• to your right

• to your left

What is the angular speed, in rad/s, of a flywheel turning at 813.0 rpm?

• 85.09 rad/s

• 95.33 rad/s

• 63.84 rad/s

• 13.53 rad/s

By what factor you multiply to convert radians to degrees:

• π/180

• 180/π

• π*180

• π²*180