Homework Help: Physics

Posted by hayley on Sunday, July 8, 2012 at 10:20pm.

A hollow sphere of radius 25 cm is rotating at 13 rad/ sec about an axis that passes through its center. The mass of the sphere is 3.8 kg. assuming a constant net torque is applied to the sphere, how much work is required to bring the sphere to a stop?

Physics - hayley, Sunday, July 8, 2012 at 10:22pm
Just to comment, I'm not trying to hw dump like the person underneath me. If someone can help me get started I can usually finish
Physics - drwls, Monday, July 9, 2012 at 2:20am
The work required to get it to stop is minus the initial kinetic energy,
-(1/2) I w^2

w = 13 rad/s in this case.
I is the moment of inertia, which for a hollow sphere of mass M and radius R is
I = (2/3)M*R^2

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