Per7_exercise - Period 7 Exercise Answers E.1 Which one of...

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Period 7 Exercise Answers E.1 Which one of the following statements is TRUE? a) In any physical process that uses energy to do work, all the energy will be transformed into useful work if we wait long enough. b) If we could construct a frictionless heat engine we could then transform all the energy we put into the heat engine into useful work. c) In any physical process that uses energy to do work, some of the energy we put into the system can never be transformed into useful work. d) NONE of the above statements is true. E.1 = c Note: statement b) – that the heat engine could operate with 100% efficiency – would be true only if the low temperature was zero Kelvin. eff = 00 1 293 293 293 0 293 . T H L = = =
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E.2 A gas exerts a pressure of 100 N/m 2 on the walls of its container. The temperature of the gas increases from 200 kelvin to 400 kelvin, while the volume of the container and the number of gas molecules remains the same. What pressure does the heated gas exert on the container? a) 50 N/m
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Per7_exercise - Period 7 Exercise Answers E.1 Which one of...

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