Air enters the compressor of a brayton refrigeration cycle at 100 kpa, 270 k. the compressor pressure ratio is 3, and the temperature at the turbine inlet is 315 k. the compressor and turbine have isentropic efficiencies of 75% and 90%, respectively. determine the network input per unit mass of air in kj/kg. the tolerance is ±5%.

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science is the study of the nature and behavior of natural things and the knowledge that we obtain about them. a science is a particular branch of science such as physics, chemistry, or biology. physics is the best example of a science which has developed strong, abstract theories.

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the fed will purchase bonds from banks to inject money into the banking system. the banks can use these funds to provide loans to individuals and businesses.

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