A 2.5” diameter by 2 in. long journal bearing is to carry a 5500-lb load at 3600 rpm using SAE 40 lube oil at 200°F through a single hole at 25 psi. Compute the bearing pressure.

The members of the structure in the figure weigh 200 lb/ft. Determine the smallest diameter pin that can be used at A if the shearing stress is limited to 5000 psi. Assume single shear. 

What is a bearing, and where is it used?

Compute the diameter of a mild steel rod which have been cold 
worked to 27.59% having original diameter of 23.15mm?

plz answer its question.