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The proportional limit is always greater than the yield strength for a material. a)-trune b)- false

The process in which the system pressure remain constant is called a)-isobaric b)-isochoric c)-isolated d)-isothermal

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.