A Hollow power transmission shaft of length ‘L’ 1103 mm, outer diameter ‘D’ 73mm and inner diameter 'd' 50. is required to transmit a power of P 60kW at a speed of 2950rpm. The modulus of rigidity of hardened carbon steel, which the shaft is made of, is 79.5 GPa. Calculate the polar second moment of area of the shaft?

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A: Given:ζ=100 MPaθ=6°f=25 HzL=15 mG=83 GPa

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