Physics for Scientists and Engineers 8ed - ch21 - end of chapter questions

# Physics for Scientists and Engineers 8ed - ch21 - end of chapter questions

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Questions W denotes answer available in Student Solutions Manual/Study Guide; O denotes objective question 1. Dalton’s law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the pressures that each gas in the mixture would exert if it were alone in the container. Give a convincing argument for this law based on the kinetic theory of gases. 2. One container is filled with helium gas and another with argon gas. Both containers are at the same temperature. Which molecules have the higher rms speed? Explain. 3. When alcohol is rubbed on your body, it lowers your skin temperature. Explain this effect. 4. O A student is asked to give a step-by-step account of what makes the temperature of a sample of gas increase. His response: When a sample of a gas is held over a hotplate, (a) the molecules speed up. (b) Then the molecules collide with one another more often. (c) Internal friction makes the collisions inelastic. (d) Heat is produced in the collisions. (e) As soon as we put in a thermometer, we see that the temperature has gone up. (f) The same process can take place without the use of a hotplate if you quickly push in the piston in an insulated cylinder containing the gas. (i)  Which of the parts (a) through (f) of this account are correct statements necessary for a clear and complete explanation? (ii)  Which are correct statements that are not necessary to account for the higher thermometer reading? (iii)  Which are incorrect statements? 5. O A helium-filled balloon initially at room temperature is placed in a freezer. The rubber remains flexible. (i) Does its volume (a) increase, (b) decrease, or (c) remain the same? (ii) Does its pressure (a) increase, (b) decrease, or (c) remain the same? 6. O A gas is at 200 K. If we wish to double the rms speed of the molecules of the gas, to what must we raise its temperature? (a) 283 K (b) 400 K (c) 566 K (d) 800 K (e) 1 130 K 7. O Rank the following from the largest to the smallest, noting any cases of equality. (a) The average speed of molecules in a particular sample of ideal gas. (b) The most probable speed. (c) The root-mean- square speed. (d) The average vector velocity of the molecules. (e) The speed of sound in the gas. 8. O Two samples of the same ideal gas have the same pressure and density. Sample B has twice the volume of sample A. What is the rms speed of the molecules in sample B? (a) twice that in sample A (b) equal to that in sample A (c) half that in sample A (d) impossible to determine 9. Which is denser, dry air or air saturated with water vapor? Explain. 10. What happens to a helium-filled balloon released into the air? Does it expand or contract? Does it stop rising at some height? 11.

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## This note was uploaded on 05/22/2010 for the course PHYS 2326 taught by Professor Staff during the Summer '08 term at HCCS.

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Physics for Scientists and Engineers 8ed - ch21 - end of chapter questions

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