Question: A flat key with square cross section is fitted on a 5 0 mm diameter shaft. The key is transmitting a torque of 4 7

A flat key with square cross section is fitted on a 50 mm diameter shaft. The key is
transmitting a torque of 475 N-m from shaft to hub. The key is made of commercial
steel with Syt=Syc=230N/mm2
. Determine the length of the key for the factor of safety
to be 3.

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