A hydraulic press is used to raise an 80 kN cargo truck. If oil of specific gravity 0.82 acts on the piston under pressure of 10Mpa. What is the diameter of piston required?

A pressure gauge connected to a pressure vessel reads 50 kPa. Compute for the absolutepressure. Assume that the standard atmospheric pressure is 22.92 in Hg. Express youranswer in psi.

5.1 Determine the spring constant of the spring arrangement if all springs have the same spring constant. 5.2 In a compound helical spring, the inner spring is concentric with the outer spring, but is 9 mm shorter. The outer spring has ten coils of mean diameter 24 mm, and the wire diameter is 3 mm. Find the stiffness of the inner spring if an axial load of 150 N causes the outer spring to compress 18 mm. If the mean coil diameter for the inner spring is 15.94 mm, find the wire diameter of the inner spring when it has eight coils. Both the springs are made of the same material having G = 77 GPa.