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A hollow steel shaft 4m long is to transmit 150 Kw power at 150 pm. The total angle of twist in this length does not

A hollow steel shaft 4m long is to transmit 150 Kw power at 150 pm. The total angle of twist in this length does not exceed 2.5 deg. And the allowable shear stress is 60 N/mm2. Determine the inside and outside diameters, if N= 0.082 X 106 N/mm2
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