Physics Rotation

How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s²?

• 4.35 s

• 5.30 s

• 10.6 s

• 63.1 s

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

• 6 rad

• -1.6 rad

• 3.2 rad

• -3.2 rad

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

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

It will be same for all points of rotating body.

• Angular displacement

• Angular acceleration

• Angular velocity

• Arc length

If sign of angular velocity and acceleration are opposite then angular velocity of object:

• speeding up

• slowing down

• will be same

• not enough information given

If the object is rotating counter clockwise and the value of ω₁ is bigger than ω_{2 ,} what would be the direction of angular acceleration?

• Up

• Down

• Left

• Right

What is ∆ϴ stand for?

• change in Angular velocity

• Change in Angular acceleration

• Change in Angular displacement

• Change in Arc length