Posted by Anonymous on Sunday, December 11, 2011 at 12:38am.
It will break when
M*R*w^2 = 36.0 N
Use M = 0.70 kg
R = 1.30 m
and solve for the angular velocity w, in radians per second.
Then convert w in rad/s to revolutions per minute
1 rad/s = 60/(2 pi) = 9.55 rpm
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