Physics
Physics, 20.12.2019 05:31, lollipop8011

Aflexible shaft consists of a 3 mm diameter steel wire in a flexible hollow tube which imposes a frictional torque of 0.04 n m per meter when the shaft rotates. the shaft is to be used for applying a torque of 0.1 n m to actuate a switch. what is the maximum length of shaft that may be used if the shear stress in the shaft is not to exceed 50 mpa?

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