- #1

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Angular acceleration= net Torque/moment of inertia so

(1.3)(.07)/ (20 *.07^2)= .93 radians/second^2

So since angular acceleration=change in angular Velocity/time then:

-.98 = (0-19.8)/change in time so t=19.2 seconds.

Where the initial angular velocity was 19.8 by converting the 180 rev/min to 19.8 radians/sec.

So is my answer of 19.2 seconds correct?

Thank you kindly for your help.