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ef152-rec-6-5 - on the gas(c What is the change in internal...

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EF 152 – Physics for Engineers Spring, 2009 Recitation 6.5 Review 1. What is the average kinetic energy per molecule of a gas at room temperature, 293K? If the gas is O 2 , what is the rms speed? 2. One mole of helium is in contact with a thermal reservoir at 350K is under 10 atm of pressure. The pressure is slowly increased to 25 atm. (a) What are the initial and final volumes of the gas? (b) How much work is done by the gas? (c) What is the change in internal energy of the gas? (d) What is the heat flow into the gas? 3. One mole of helium is in contact with a thermal reservoir at 350K is under 10 atm of pressure. The pressure is rapidly increased to 25 atm. (a) What are the initial and final volumes of the gas? (b) How much work is done
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Unformatted text preview: on the gas? (c) What is the change in internal energy of the gas? (d) What is the heat flow into the gas? 4. Book problem Chapter 18, Problem 47. Challenge: Work this problem with only the given temperature and pressures. You should not have to actually calculate other temperatures, pressures, or volumes. 5. In order to make an ice cube from water, a refrigerator must extract 1400 cal of heat at the temperature of the freezer, -12°C. The room temperature is 30°C. What minimum work must an ideal refrigerator do? 6. Calculate the change in entropy of 2 kg of water when it is heated from liquid water at 60°C to steam at 100°C....
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