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A steel shaft transmits 20 kW of power at 10 Hz. Determine the smallest safe diameter...

A steel shaft transmits 20 kW of power at 10 Hz. Determine the smallest safe diameter of the shaft if the shear stress τmax is not to exceed 50 MPa and the angle of twist θ is limited to 5°in a length of 4 m. Use G = 70 GPa. Using the relationship θ = TL / IpG in the above problem, again determine the diameter that is necessary to satisfy the requirement of rigidity (remembering to convert θ from degrees to radians). Considering the strength and rigidity requirements, which diameter should we choose.

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