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A shaft of 30 mm diameter is transmitting power at a maximum shear stress of 80 MPa. If a pulley is connected to the shaft

A shaft of 30 mm diameter is transmitting power at a maximum shear stress of 80 MPa. If a pulley is connected to the shaft by means of a key, find the dimensions of the key so that the stress in the key is not exceeded 50 MPa and the length of the key is 4 times the width.

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