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PAL 3/30/12

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  1. PAL 3/30/12 • An ideal gas is compressed from vi to vf=vi/2. If the process is isothermal, then Pf___ . If the process is adiabatic, then Pf___ . • =Pi/2, >Pi/2 • =Pi/2, <Pi/2 • =2Pi, >2P • =2Pi, <2Pi • A process occurs in which the temperature of an ideal gas increases. Which of the following must be true? • the internal energy of the gas increases • heat flows into the gas • the pressure of the gas increases • more than one of the above • 2 kg of pure saturated liquid water is in a piston-cylinder device held at constant pressure of 10 kPa. 15% of the water is allowed to vaporize. During this process, the temperature • increases • decreases • remains constant at T<100 oC • remains constant at T>100 oC

  2. 100 g of liquid water is held at a constant pressure of 10MPa while its temperature is increased from 60oC to 70oC. • Find the change in internal energy of the water. • Find the change in enthalpy of the water. • Find the heat transfer to or from the water. • Approximate the heat capacity of the water for this temperature range. • 100 g of liquid water is held at a constant volume. It is initially at a temperature of 60oC and a pressure of 10MPa. It is heated until its pressure is 15MPa. • Find the final temperature of the water. • Find the heat transfer to or from the water. • Approximate the heat capacity of the water for this temperature range.

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