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A lubricated power screw is used to lower a 1000 N load. The screw has a...

A lubricated power screw is used to lower a 1000 N load. The screw has a major diameter of 40 mm, a mean diameter of 37.5 mm and a lead of 8 mm. The coefficient of friction is 0.15. Neglecting the collar friction, what is the torque required to lower the load?

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