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3) We want to design a key for a car power transmission shaft which transmits power of P = 50 kW at n =

3) We want to design a key for a car power transmission shaft which transmits power of P = 50 kW at n = 4000 rpm. Shaft has a diameter of d = 40 mm and material has yield strngth of Sy = 600 MPa. If the width of the key is limited to w = 8 mm, find the length of utilized key l considering failure by shear (distorsion-energy) and failure by crushing.

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