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Circular Decceleration

Problem:

The turntable of a record player rotates at a rate of 50.7 rev/min and takes 92.7s to come to rest when switched off.

Calculate the magnitude of its angular acceleration. Answer in units of rad/s^2.

Solution:

First I converted rev/min to rad/s. Which I got to be 5.309 rad/sec. Then I found the constant average decceleration which would be the decceleration because it is a constant decceleration.

A(avg)
=
The Change in Velocity
---------------------
The Change in Time

My soultion, which is wrong, is -.0573. What am I doing wrong?
 
Last edited:
Ha!

Well, it was asking for the magnitude... so the solution was .0573 not -.0573.
 

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