phys213_final

phys213_final - Sample exam questions

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Sample exam questions The following list of questions are provided of as a sample of questions that have been used in other semesters. As such, they are indicative of the type of material that has been expected of students in the past. There are 30 questions contained in this sample set of problems. Your final exam will have only 25 questions. In order to get the maximum benefit from these questions, avoid “back engineering” solutions. “Back engineering” solutions often results in a false sense of understanding of the material. Do these problems as you would an examination. Give yourself a fixed amount of time and use only those materials (pencils, calculator, etc) that you will have available to use during the actual exam. Those questions that you miss should indicate areas that may benefit from additional preparation. Good luck on the exam!
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1. Does the temperature of an ideal gas increase, decrease or stay the same during (a) an isothermal expansion (b) an expansion at constant pressure (c) an adiabatic expansion (d) an increase in pressure at constant volume? A. stays same, increases, decreases, increases B. decreases, increases, increases, decreases C. stays same, decreases, decreases, increases D. increases, stays same, decreases, stays same E. stays same, stays same, increases, stays same 2. A pipe of length L = 29.6 m that is open at one end contains air at atmospheric pressure. It is thrust vertically into a freshwater lake until the water rises halfway up into the pipe, as shown in the figure. What is the depth " h " of the lower end of the pipe? Assume constant temperature everywhere, and treat air as an ideal gas. A. 10.4 m B. 22.8 m C. 25.0 m D. 47.8 m E. 50.0 m Page 1
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3. The pressures p and volumes V of five ideal gases, with the same number of molecules, are given below. Which has the highest temperature? A. p = 1 × 10 5 Pa and V = 10 cm 3 B. p = 3 × 10 5 Pa and V = 6 cm 3 C. p = 4 × 10 5 Pa and V = 4 cm 3 D. p = 6 × 10 5 Pa and V = 2 cm 3 E. p = 8 × 10 5 Pa and V = 2 cm 3 4. The rms speed of O 2 molecules (molar mass: 32g) in Buenos Aires (which means "good air") is currently 500 m/s. What is the Celsius temperature in Buenos Aires? A. -5.1°C B. 1.3°C C. 21°C D. 33°C E. 48°C 5. Consider 100 moles of an ideal gas (with γ = 5/3) confined to a volume of 7 m 3 at a pressure of 0.2 atm. The total mass of the gas is 0.5 kg. What is the root mean square (rms) speed of the molecules in the gas? A. 250 m/s B. 340 m/s C. 480 m/s D. 510 m/s E. 920 m/s Page 2
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6. The force on the walls of a vessel of a contained gas is due to: A. the repulsive force between gas molecules. B. a slight loss in the speed of a gas molecule during a collision with the wall. C. a change in momentum of a gas molecule during a collision with the wall. D. elastic collisions between gas molecules. E. inelastic collisions between gas molecules.
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phys213_final - Sample exam questions

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