A clock has a second hand whose tip rubs against the inside, Ask an Expert

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A clock has a second hand whose tip rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the second hand is 0.0020 N and the length of the hand is 9.0 cm, what is the minimum torque that must be applied to the second hand if the clock is not to be stopped?

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Category:- Physics
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