Homework Help: Physics

Posted by BBB on Thursday, July 8, 2010 at 5:08pm.

A merry-go-round has a mass of 1580 kg and a radius of 7.25m. How much net work is required to accelerate it from rest to a rotation rate of 1 revolution per 7.1s? Assume it is a solid cylinder.

Physics - drwls, Thursday, July 8, 2010 at 6:35pm
The work required equals the final kinetic energy.

The Kinetic Energy is (1/2) I w^2
The moment of inertia (for a solid disc) is (1/2)M R^2.

w = (2 pi radians)/7.1 s = 0.885 rad/s
is the angular velocity

Put it all together.

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