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October 2, 2014

October 2, 2014

Posted by **Kyle** on Sunday, November 2, 2008 at 10:53am.

I found moment of inertia by .5xMRe2

How do you find angular velocity?

- Physics -
**drwls**, Sunday, November 2, 2008 at 11:34amThe moment of inertia of a uniform sphere is NOT (1/2) M R^2. Try that part again.

http://scienceworld.wolfram.com/physics/MomentofInertiaSphere.html

What you want to calculate is

Rotational KE = (1/2) I w^2

w is the angular velocity for ROTATION in radians per second, and equals 2 pi divided by the number of seconds in a sidereal day (23 hours, 56 minutes)

The circular path assumption does NOT have to be made. They are either trying to confuse you or the teacher who assigned the question is not well trained.

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