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79) The screw of a certain press has a pitch of 0.20cm. The diameter of the wheel to which a tangential turning force F

79) The screw of a certain press has a pitch of 0.20cm. The diameter of the wheel to which a tangential turning force F is applied is 55cm. if the efficiency is 40%, how large must F be to produce a force of 12-kN in the press.

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