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## Homework Statement

A solid circular steel drive shaft is 4 m long and 60 mm diameter. The modulus of

rigidity of the steel is 85 GPa and its maximum allowable shear strength is 150 MPa.

The shaft is used to transmit a power of 30 kW while rotating at 500 rev/min.

Calculate the following:

a) the torque carried by the rotating shaft [2 marks]

## Homework Equations

J=pi(R^4)/2=1.272*10^6 mm^4

T=(J*maximum shear stress)/r

## Homework Statement

How do i get the maximum shear stress?