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Determine the power lost in a footstep bearing...........

Question: 

Determine the power lost in a footstep bearing due to friction if a load of 15 kN is supported and the shaft is rotating at 100 r.p.m. The diameter of bearing is 15cm and coefficient of friction is 0.05.

Assume :

(i) Uniform wear condition

(ii) Uniform pressure condition.

Answer: