A hockey puck of mass m is attached to a string thatpasses through a hole in the

Question

A hockey puck of mass m is attached to a string thatpasses through a hole in the center of a table. The hockey puckmoves in a circle of radius r. Tied to the other end ofthe string, and hanging vertically beneath the table, is a massM. Assuming the tabletop is perfectly smooth, what speedmust the hockey puck have if the mass M is to remain atrest? (Use g for acceleration due to gravity, andm, r, and M as necessary.) This is the question. I need the formula to use. Pleaseassist. THANK YOU :-) A hockey puck of mass m is attached to a string thatpasses through a hole in the center of a table. The hockey puckmoves in a circle of radius r. Tied to the other end ofthe string, and hanging vertically beneath the table, is a massM. Assuming the tabletop is perfectly smooth, what speedmust the hockey puck have if the mass M is to remain atrest? (Use g for acceleration due to gravity, andm, r, and M as necessary.) This is the question. I need the formula to use. Pleaseassist. THANK YOU :-)

Explanation / Answer

at one end, tension T is the centripetal force that makes m go in acircle. at the other end, T balances the weight of M. T = Mg = mv2/r v = (Mgr/m)

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