Rotational Motion Review

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

• 2600 rad/s 
• 43.3 rad/s 
• 273 rad/s
• 60 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 0.30m radius automobile tire rotates how many radians 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

A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s². What is the time interval required for it to reach a 4.2 rad displacement after starting from rest   

• 1.8 s
• 2.0 s
• 16 s
• 18 s

Which object will always have the most rotational inertia? (consider all objects have equal radius)

• A hoop

• A solid sphere

• A solid disk

• A solid block

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

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

• Increase

• Decrease

• Stays the same

• Is lost

Tags

NGSS.HS-PS2-2

The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P?

• A
• B
• C
• rotational inertiaD

A solid sphere, solid cylinder, and a block all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane which one will reach the bottom first?

• cylinder

• block

• sphere

• They all reach the bottom at the same time.