Homework Help: physics

Posted by amy on Monday, April 18, 2011 at 11:52am.

A DVD is spinning at 180 rpm’s. Calculate its angular acceleration when it increases to 240 rpms’s in 2 seconds. (Remember, convert rpm’s to radians/second)

physics - Henry, Tuesday, April 19, 2011 at 6:44pm
Vo = 180rev/min * 6.28rad/rev * (1/60)min/s = 18.84rad/s.

Vf = 240/180 * 18.84 = 25.12rad/s.

a = (Vf-Vo)/t = 25.12 - 18.84) / 2 = 3.14rad/s^2.

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