physics
posted by Nic .
A mass m = 0.225 kg on a frictionless table is attached to a hanging mass M = 0.330 kg by a cord through a hole in the table (see the figure). Find the speed with which m must move in order for M to stay at rest if r = 27 cm.

Hmmm. I assume M is rotating.
Mv^2/r=mg
solve for v.
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