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The refrigerant R-22 is used as the working fluid in a conventional heat pump cycle. Saturated vapor enters the compressor of this unit at 50 F; its exit temperature from the compressor is measured and found to be 185 F. If the compressor exit is 300 psia, what is the isentropic efficiency of the compressor and the coefficient of performance of the heat pump?
a piston-cylinder device initially contains 1.2 kg of steam with a volume of 0.2 m3. the mass of the piston is such
a random sample of size 56 from a normal population showed a mean of 63 and a sum of squares of deviation from the
a motorcycle is moving at 30 ms when the rider applies the brakes giving the motorcycle a constant deceleration. during
a turbine is operated with an enthalpy at entrance of 1340 btulbm and an exit enthalpy of 1285 btulbm. if the entrance
The magnitude of the horizontal(to the right) for F1 is 5kN and F1 + F2 + F3 = 0. What are the magnitude of F2 and F3?
in an orthogonal cutting operation the chip velocity was determined using a laser doppler velocimeter ldv as 80 of the
Estimate the theoretical fracture strength of a brittle material if it is known that fracture occurs by the propagation of an elliptically shaped surface crack of length 0.16 mm and that has a tip radius of curvature of 0.002 mm when a stress of 1..
A block and tackle system with nine supporting strands is used to lift a metal lathe in a manufacturing plant. The motor being used to wind the cable in the pulley system can provide 100 lb. of force.
a compressed air cylinder initially contains air at 25ordmc and 100 kpa. the volume of the cylinder is 0.01021 m3. the
the uniform slender bar abc weighs 6 lb and is intially at rest with end a bearing against the stop in the horizontal
in an annealing process a stainless steel plate 50 mm thick will be heated to at least 600degc from an initial
the viscoelastic response of a common orthopedic polymer is represented using a maxwell model so that the spring
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