A machine has a velocity ratio of 5 and a mechanical advantage of 4. the system is used to raise a load of 500N through 10m. the wested energy is A,6250 J C,5000J
B,1250J D,12500J
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Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)