Angular Accelerations of a Record Player

The video tutorial covers the problem of a record player accelerating and decelerating, focusing on converting angular velocity units, calculating angular velocities and times for different phases, and determining average angular acceleration. It explains the solutions for each part, emphasizing the importance of unit conversion and understanding angular motion concepts.

What is the angular velocity in radians per second when converted from 45 revolutions per minute?

• 1.5 radians per second

• 1.5 pi radians per second

• 4.7124 radians per second

• 3.14 radians per second

How long does it take for the record player to reach its speed in part A?

• 0.85 seconds

• 3.37 seconds

• 2.32 seconds

• 1.5 seconds

What is the initial angular velocity for part A of the record player's motion?

• 1.5 pi radians per second

• 0 radians per second

• 2 pi radians per second

• 45 revolutions per minute

What is the average angular acceleration during part A?

• 3.0 radians per second squared

• 5.5 radians per second squared

• 2.0 radians per second squared

• 0 radians per second squared

Why is the angular acceleration zero during part B?

• The record player is speeding up.

• The record player is slowing down.

• The angular velocity is constant.

• The angular velocity is zero.

What is the angular acceleration during part C?

• 2.0 radians per second squared

• -2.0 radians per second squared

• 0 radians per second squared

• 5.5 radians per second squared

What happens to angular acceleration when the record player slows down in a positive direction?

• It becomes positive.

• It becomes zero.

• It remains constant.

• It becomes negative.