Problem on Torsion/Composite Shaft/ Determination of External diameter of Shaft and Angle of Twist

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Problem on Torsion/Composite Shaft/ Determination of External diameter of Shaft and Angle of Twist
Problem : A composite shaft consists of a steel rod of 60 mm diameter surrounded by a closely fitting tube of brass. Find the outside diameter of the brass tube, when a torque of 1 KN-m is applied on the composite shaft and shared equally by the two materials. Take C for steel as 84 GPa and C for brass as 42GPa. Also determine the common angle of twist in a length of 4 meter.
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