If the maximum tensile force in any of the truss members must be limited to 28 kn, and the maximum compressive force must be limited to 37 kn, determine the largest permissible mass m which may be supported by the truss.

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