(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A boy sits on top of an igloo shaped like a semi-circle of Radius R. He begins to slide down the semi-circle. At what height above the ground does the boy slide off the semi-circle? Assume g=9.8 m/s2, and no friction.

http://img207.imageshack.us/img207/4010/probmd1.jpg [Broken]

2. Relevant equations

Conservation of energy? Or centrifugal force?

3. The attempt at a solution

Couldn't think of any starting points; tried conservation of energy, but failed. Answer is obviously in terms of R. Can anyone shed the light on this problem?

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# Sliding Off A Semi-Circle

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