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A record turntable rotating at 33 1/3 rev/min slows down and stops in 45 s after...

A record turntable rotating at 33 1/3 rev/min slows down and stops in 45 s after the motor is turned off.

(a) Find its (constant) angular acceleration in revolutions per minute-squared.
rev/min2
(b) How many revolutions does it make in this time?
rev

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Answer #1

A)

w = wo + at

0 = 33 1/3 + a (45/60)

a = - 44.44 rev/min^2

B)

Theta = (33 1/3) x (45/60) - 0.5 x 44.44 x (45/60)^2

Theta = 12.50 rev

Comment in case any doubt please rate my answer ....

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