# Rotational Work and Energy

#### Nb

I have no idea how to do this question

A tennis ball, starting from rest, rolls down the hill in the drawing. At the end of the hill the ball becomes airborne, leaving at an angle of 35° with respect to the ground. Treat the ball as a thin-walled spherical shell, and determine the range x.

http://edugen.wiley.com/edugen/courses/crs1000/art/images/c09/nw0370-n.gif

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#### faust9

First off, do you know the moment of inertia equation for a thin walled sphere? If not you'll need it.

I'd use the conservation of energy equation to find the velocity at the bottom and then a simple range equation to find the distance. Range would be failrly straightforward here because ho=hf once the ball becomes airborn.

That's how I would approach it.

Good luck.

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