Compare the angular acceleration of a CD player and a record player when playing

Question

Compare the angular acceleration of a CD player and a record player when playing a song.What will happen as the radius of the read head or the phonograph changes. (Select all that apply.)

a. The CD's angular speed changes to maintain the same linear speed at all radii.

b.The record player has zero angular acceleration.

c. The CD's linear speed at the track being read varies with radius of the track.

d. The CD has zero angular acceleration.

e. The record player's angular speed changes to maintain the same linear speed at all radii.

Explanation / Answer

For record players angular speed is constant and linear velocity increases with increasing r value. (v =rw)

Angular speed is constant so angular acceleration is zero. (alpha =dw/dt =0)

For CD player linear velocity is constant. To mainthat CD angular speed changes at all radii

angular velocity changes.So Cd have angulae acceleration . (alpha = dw/dt)

Correct options are (a) , (b)

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