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Home Q & A Board Science-Related Homework Help Physics
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rkearl27 rkearl27
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11 years ago
A drum major twirls a 91-cm-long, 480 g baton about its center of mass at 140rpm .

What is the baton's rotational kinetic energy?
Express your answer using two significant figures.
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RJ
wrote...
#1
11 years ago
KE = (0.5) ( i ) (W)^2

I = the inertia of the object, a rod is (1/12) ( M ) ( R^2 )
W = (rpm*2*pi)/60

so, w = (140 * 2 * pi)/60 = 14.66
so, i = (1/12) * 0.48 * 0.91 = 0.0364

0.5 * 0.0364 * 14.66^2 = 3.91187

have fun on mastering physics, i hate it too!
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