Posted by **Physics** on Saturday, September 5, 2009 at 8:28pm.

centripetal acceleration= friction

m*w^2 r = mu*mg

changing 50 rpm to rad/sec

mu=w^2 r/g=(50*2PI/60)^2 * .12

which is not your answer.

Check my thinking.

ok I thought centripetal force was equal to

m ac

were ac is the centripetal acceleration

which is equal to v^2 divided by r I don\'t recall it being equal to times r

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