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Helium gas is contained in a rigid vessel of 0.5 m3 at 500 kPa. The gas is agitated violently by a stirrer that transfers 250 kJ of work to the gas. Assuming that the system undergoes an adiabatic process, determine the final pressure of the gas. Assume that Cv for helium is a constant at 12.46 kJ/kmol·K.
The efficiency of a refrigerator is given by the coefficient of performance (COP). Write two different expressions for the COP of a refrigeration cycle; one in terms of heat transfer and work input, and the other in terms of heat transfers only.
1. for each of the two proposed replacement presses determinenbspa. initial investment.nbspb. operating cash inflows.
a thin plate moves between two parallel horizontal stationary flat plates at a constant velocity of 5 ms.the two
For the process where q= 62.5 kj/kg and wkcs= 60 kj/kg determine the energy change if the system mass is 2 kg.
calculate the the maximum length on the small diameter of a shaft that is supported by a bearing at each end with a
the turntable of a record player rotates initially at the rate 33 revmin and takes 14.07 s to come to rest. what is the
an airplane is flying at v0130 mph and with a constant time rate of increase of speed v22fts2 when it starts to climb
a pressure transducer that behaves as a second order system is used to monitor pressure fluctuations in a petrochemical
the driver of a car which is initially at rest at the top a of the grade releases the brakesand coasts down the grade
the average grain diameter for some metal alloy was measured as function of time at 650degc which is tabulated below at
a 200 lbf weight starts at reset and is accelerated to a speed by having 20000 ft-lbf work done on it knowing there is
A lunar transfer vehicle masses 50 tonnes (metric tons, or 1000 kg) fully fuelled, has a dry mass of 15 tonnes, which includes 5 tonnes of cargo. Assume lox/hydrogen engines with Isp = 445 seconds are used. How much Delta V does this vehicle provide?
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