‏What is the potential energy in joules of a 12 kg ( mass ) at 25 m above a datum plane ?

The higher the astm grain size number, the finer the gran is. a)-true b)-false

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0

What is creep? what is stress relaxation?