¿Qué te parece que pasó con la ciudadanía durante la última dictadura en Argentina (1976/1983)? ¿los/as desaparecidos/as fueron considerados/as ciudadanos/as?

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.

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.