(a) A solid Aluminium shaft 1 m long and of 50 mm diameter is to be r…

Question

(a) A solid Aluminium shaft 1 m long and of 50 mm diameter is to be replaced by a hollow steel hollow shaft of the same length and same outside diameter, so that the shaft could carry the same torque and has the same angle of twist. What must be the inner diameter of the hollow shaft ?

Take rigidity modulus for Aluminium and steel as 28 GPa and 85 GPa respectively.

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