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                Olympiad 3
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            At what point does a small ball rolling off a big one leave it's surface.
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            <h4>A small, frictionless ball is placed on top of a big one and it slides down. Show that it will always leave the surface when the line joining the centres of the balls has swept through an angle of 48.2&deg;.</h4>

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            <button data-out="a" class="btn btn-default btn-nav">But we don't know how big the balls are.</button> <button data-out="b" class="btn btn-default btn-nav">I have no idea how to do this.</button> <button data-out="c" class="btn btn-default btn-nav">I can't visualise what's happpening.</button> 
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