The cross-section of a fl at key for a 40 mm diameter shaft is 22 14 mm. The power transmitted by the shaft to the hub is 25 kw at 300 rpm the key is made of steel (syc =syt = 300 n/mm2) and the factor of safety is 2.8. Determine the length of the key. Assume (ssy = 0.577 syt)
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