Hockey Puck
Hockey Puck
hockey puck?
A hockey puck of mass m is attached to a string that passes through a hole in the center of a table. The hockey puck moves in a circle of radius r. Tied to the other end of the string, and hanging vertically beneath the table, is a mass M. Assuming the tabletop is perfectly smooth, what speed must the hockey puck have if the mass M is to remain at rest? (Use g for acceleration due to gravity, and m, r, and M as necessary.)
The weight of mass M acts on mass m as centripetal, so:
Fc=W
m*v^2/r=M*g
v^2=(M*g)/m
v=sqr(M*g/r)
Hope it helps
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