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Homework Statement
A turbine shaft is to transmit power at 240 rev/min. If the shaft is 1 m external diameter and 25 mm thick and the maximum shear stress is limited to 69 MPa, find the power transmitted.
Homework Equations
The Attempt at a Solution
T=J*stress/r = pi(1000^4-950^4) * 69/(32*100)
P=(2pi*240*T)/(60*10^6)
The answer should be 66GW whoch I am not getting. Can somebody please help?