ࡱ> (*'{7 bjbjUU %<7|7|,l       8(LQ24Ћҋҋҋҋҋҋ$       ЋЋd]~ t  t C}b3,!0Q̊??    Phys24-001, Fall 2001 Exam 3 Name _____________________________ PID: __________________ Sequence Number: 101 Honor Pledge and signature: I have neither given nor received unauthorized aid on this examination. _____________________ Instructions: This exam is closed book, closed notes. However, you may use a calculator. Mark your answers to the multiple-choice questions on a Scantron answer sheet. If you do not find your answer, write your solution on these pages and mark option 5. You may write on these test papers, but partial credit will not be given on the multiple-choice section. Turn in your Scantron answer sheet and these test papers at the end of the hour. Equations and conversion factors that may be useful:  EMBED Equation.3  (air = 1.29 kg/m3 1. A tire stops a car by use of friction. What modulus should we use to calculate the stress and strain on the tire? 1. Youngs modulus 2. Compression modulus 3. Bulk modulus 4. Shear modulus 2. An aluminum ball has a diameter that is slightly larger than a hole in the center of a steel plate when they are both at room temperature. How can the ball be made to fit through the hole without deforming either the ball or the plate? (Hint: Aluminum has a higher coefficient of linear expansion than steel.) 1. heat the steel plate 2. heat both the ball and plate 3. cool both the ball and plate 4. none of the above 3. A brick is tied to a toy balloon that is inflated with just enough air so that it remains suspended just below the surface in a pool of water (the brick and balloon combination are essentially neutrally buoyant). If the balloon is pushed down and then released, what will happen? 1. the balloon will rise back up to the surface 2. the balloon will sink to the bottom of the pool 3. the balloon will not float or sink, but will remain at the depth to which it was pushed down 4. there is not enough information to answer this question 4. An ice cube contains several pebbles that make it heavy enough that it sinks to the bottom of a glass of water. When the ice melts, what happens to the water level in the glass? 1. nothing the water level stays the same 2. the water level rises as the ice melts 3. the water level falls as the ice melts 4. the answer depends on the relative size and density of the pebbles 5. When a rock is suspended in air by a spring scale, the scale shows a force of 50 N. When the rock is submerged in water, the scale reads 30 N. How much force will the floor of the container exert on the rock when it is allowed to sink to the bottom? 1. Zero 2. 20 N 3. 30 N 4. 50 N 6. The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems? 1. zero net forces 2. zero velocities 3. zero temperature 4. thermal equilibrium 7. You decide to use your physics knowledge to make iced tea by heating a cup of water in a microwave oven and adding tea bags to make a concentrated hot tea. You will then add equal amounts of cold water and ice, but which procedure will yield the coldest pitcher of tea after 10 minutes? 1. Wait 10 minutes for the hot tea to cool, then add cold water and ice 2. Add cold water, wait 10 minutes, then add ice 3. Add ice, wait 10 minutes, then add cold water 4. Add both cold water and ice immediately 8. Some emergency blankets are made of Mylar, which is a thin plastic material that is coated with aluminum. These blankets utilize which heat transfer process to keep a person warm? 1. conduction 2. convection 3. radiation 4. vaporization 9. The internal energy of a gas is most closely related to which quantity? 1. temperature 2. pressure 3. heat 4. entropy 10. A plastic sphere is 1.0 cm in diameter and has a mass of 1.0 g. Will it float in water? 1. yes 2. no 3. it depends if the sphere is solid or hollow 11. An air bubble has a volume of 0.25 cm3 when it is at a depth of 20 m in a pool of fresh water. What is its volume just before it reaches the surface? 1. 0.25 cm3 2. 0.50 cm3 3. 0.75 cm3 4. 1.0 cm3 12. A deflated rubber balloon is placed on a digital balance and found to have a mass of 5.0 g. It is inflated with air to a diameter of 30 cm, and placed on the same balance, which now shows a reading of 5.7 g. What is the magnitude of the buoyant force acting on this inflated round balloon? 1. 0.0069 N 2. 0.056 N 3. 0.14 N 4. 0.18 N 13. An ideal fluid flows through a pipe made of two sections with diameters of 1 and 4 inches, respectively. The speed of the fluid through the 1-inch section will be what factor times that through the 4 inch section? 1. 4 2. 16 3. 1/4 4. 1/16 14. If the column of mercury in a barometer stands at 72.6 cm, what is the atmospheric pressure? (The density of mercury is 13.6 ( 103 kg/m3) 1. 0.925 ( 105 N/m2 2. 0.967 ( 105 N/m2 3. 1.03 ( 105 N/m2 4. 1.073 ( 105 N/m2 15. What is the maximum weight that could be supported by a suction cup that is 6 inches in diameter? 1. 90 lbs. 2. 140 lbs. 3. 400 lbs. 4. 1700 lbs. 16. Blood flows through a human aorta at a speed of about 50 cm/s. What is the rate of blood flow if the average inner diameter of this heart vessel is 2.0 cm? 1. 100 cm3/s 2. 160 cm3/s 3. 310 cm3/s 4. 630 cm3/s 17. One mole of an ideal gas is at a pressure of 5.4 atm and a temperature of 22 (C. If the gas is heated at a constant volume until the pressure triples, what is the final temperature? 1. 66 (C 2. 339 (C 3. 610 (C 4. 885 (C 18. How much hot water at 70 (C is needed to completely melt 100 g of ice that is initially at a temperature of 10 (C? 1. 90 mL 2. 100 mL 3. 110 mL 4. 120 mL 19. Estimate the power of a microwave oven that requires 2 minutes on high to boil one cup of water (250 mL) that is initially at room temperature. 1. 550 W 2. 650 W 3. 750 W 4. 850 W 20. The filament temperature of a light bulb is 1000 K when the bulb delivers 20 W of power. 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