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torque exerted about the center of the nut

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A machinist is using a wrench to loosen a nut. The wrench is 25.0 cm long, and he exerts a 17.0 N force at the end of the handle at 37 degrees (see attachment).

a) What is the magnitude of the torque does the machinist exert about the center of the nut?

b) What is the maximum torque he could exert with this force?

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The solution explains how to calculate the torque of the force exerted about the center of the nut when loosing it using a wrench (see attachment).

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