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The drive shaft AB of an automobile with 1.7 m long is made of a steel...

The drive shaft AB of an automobile with 1.7 m long is made of a steel having an allowable shear stress τall = 60 MPa and modulus of rigidity G = 80 GPa. Limit angle of twist of the shaft is 0.035 rad. If the outer diameter of the shaft is 65 mm and the engine delivers 180 kW to the shaft when it is turning at 1170 rev/min, determine the minimum required thickness of the shaft’s wall.

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