PRACTICE IT: A compact disc rotates from rest up to an angular speed of 31.7 rad

Question

PRACTICE IT: A compact disc rotates from rest up to an angular speed of 31.7 rad/s in a  time of 0.878 s.

-angular acceleration of the disc= 36.105

-angle the disc turns while coming up to speed= 13.916

-If the radius of the disc is 4.45 cm, find the tangential speed of a  microbe riding on the rim of the disc= 1.412

-What is the magnitude of the tangential acceleration of the  microbe at the given time?= 1.606

Use the values from PRACTICE IT to help you work this exercise.

(a) What are the angular speed and angular displacement of the disc 0.260 s after it begins to rotate?                 

Explanation / Answer

a)

W2=W1+alpha*t

W2=31.7+(36.105

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