Air that has a total mass of 0.1 lbm is confined inside a piston-cylinder system with a temperature of s5 °f and a pressure of 30 psi heat is added to the system while maintaining a constant pressure and as a result, during the process, the 6 in diameter piston rises a distance of 11.3 in. calculate (a) the work done per unit mass in [ft-lb/lbm] and (b) the change in specific internal energy in [btu/lbm] for this process.

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.