Acopper cylinder with a diameter of 3 in is initially at a uniform temperature of 70 f. how long after being placed in a medium at 1000 f with an associated convective heat‐transfer coefficient of 4 btu/h ft2 f will the temperature at the center of the cylinder reach 500 f, if the height of the cylinder is (a) 3 in? (b) 6 in? (c) 12 in? (d) 24 in? (e) 5 ft?

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false