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A hockey puck of mass m = 0.25 kg is tied to a string and is rotating horizontally in a

circle of radius R = 1.0 m on top of a frictionless table. The string is passing through a hole in

the center of the table with a mass of 1 kg hanging vertically downward below the table. If the

1 kg mass hanging below the table remains in

equilibrium (at a fixed position) while the puck is

rotating horizontally.

Since the weight below the table remains in equilibrium, the tension in the rope must

equal the weight suspended from it

T = W = (1 kg) × (9.81 m/s2

) = 9.81 N

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