A hockey puck of mass m = 110 g is attached to a string that passes through a ho

Question

A hockey puck of mass m = 110 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 0.50 m. Tied to the other end of the string, and hanging vertically beneath the table, is a mass M = 0.90 kg. Assuming the tabletop is perfectly smooth, what speed must the hockey puck have if the mass Mis to remain at rest?

A hockey puck of mass m = 110 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 0.50 m. Tied to the other end of the string, and hanging vertically beneath the table, is a mass M = 0.90 kg. Assuming the tabletop is perfectly smooth, what speed must the hockey puck have if the mass Mis to remain at rest?

Explanation / Answer

mpuck = 110g = 0.11 kg

mbox = 0.9 kg

r= 0.5 m

vbox = 0 m/s

mpuckv2/r = mboxg

(0.11)v2/(0.5) = (0.9)(9.81)

v = sqrt[ (0.9)(9.81)(0.5)/(0.11) ]

v = 6.33 m/s

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