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24. Electricity from AAA battery costs the consumer abouta. $1000 per kilowatt-hour25. Electricity from a wall plug costs the consumer abouta. 10 cents per kilowatt-hour26. The energy per gallon of liquid hydrogen, compared to gasoline is abouta. 3 times moreb. or 3 times lessChapter 1 Questions 1. “Smart Rocks” are considered for a. Ballistic missile defense 2. One watt is equivalent to: a. One joule/sec 3. The asteroid that killed the dinosaurs exploded becausea. It got very hot from the impact 4. Kinetic energy can be measured in: a. Calories 5. Which of the following statements is true? a. Power is energy divided by time 6. Next to each of these mark whether it is a unit of energy (E) or power (P)a. Horsepower _p____ b. Kilowatt-hour _e____ c. Watt ____p_ d. Calorie ___e__ 7. What is the main reason that hydrogen-driven automobiles have not replaced gasoline ones? a. Hydrogen is too difficult to store in an automobile 8. Hybrid vehicles run on: a. Electric power and gasoline 9. Compared to an equal weight of gasoline, uranium-235 can deliver energy that is greater by a factor of (pick the closest) a. One million 10. What contains the most energy per gram? a. Uranium11. Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight batteries: a. The gasoline has about 400 times as much energy b. Or 10x12. The kinetic energy of a typical 1-gram meteor is approximately equal to the energy of a. 10 grams of gasolineb. or 150 grams of gasoline13. The kinetic energy of a bullet, per gram, is (within a factor of 2) a. About the same as the energy released from one gram of TNT 14. Coal reserves in the United States are expected to last for a. Hundreds of years 15. A limitation for all electric automobiles isa. Low energy density per battery b. Or electric motors are less efficient than gas motors16. Solar power is about (mark all that are correct): a. 1 kW per square meter b. 1 GW per sq. km17. The efficiency of inexpensive solar cells is closest to a. 12% 18. A human, running up stairs, can briefly use power of approximately a. 1 horsepower 19. A 12-oz can of soft drink (not the “diet” or “lite” kind) contains about a. 150 Calories 20. A large nuclear power plant delivers energy of about a. Gigawatt 21. Which is not a unit of energy? a. Watt 22. Compared to TNT, a typical meteor with the same mass has energy that is a. 100 times larger 23. What is the least expensive for the same energy delivered?a. Coal24. Electricity from AAA battery costs the consumer abouta. $1000 per kilowatt-hour25. Electricity from a wall plug costs the consumer abouta. 10 cents per kilowatt-hour26. The energy per gallon of liquid hydrogen, compared to gasoline is abouta. 3 times moreb. or 3 times less27. Most of the hydrogen we use in the United States comes froma. It is manufactured from fossil fuels and /or waterb. Or from nuclear reactors 28. You have 10 tungsten bulbs, and each uses 100 watts. You leave them all on for an hour. The energy used isa. 1 Kilowatt-hour29. What are the units for power?a. Wattsb. Kilowattsc. Horsepower30. If you double the energy content of a kilogram of gas, the temperature of the gas (measured on the absolute K scale): a. doubles 31. About how fast are molecules in air moving?a. 1000 ft/s b. or the speed of light32. Temperature is the measure of a. average kinetic energy 33. In a bucket of water, the instantaneous speed of the molecules is closest to a. approximately 1000 ft/s 34. A refrigerator operating in a room a. warms the room 35. a refrigerator with its door open is operating in a room ita. has no effect on the room36. The atom with the fewest number of protons is a. hydrogen 37. How many atoms are there if you move across a human hair? Abouta. 125,000 38. The speed of sound is approximately a. 1000 feet per second 39. A gas heater warms a room mostly through a. convection 40. The velocity of sound a. increases when the temperature increases41. If a gasoline engine produces a hotter explosion, then the efficiency of the engine should a. goes up42. Sea level is rising from global warming. The main cause is a. expanding sea water 43. The temperature warms by 2 C. That is approximately the same as a. 4 F 44. To heat a room using the least energy, do it by: a. using natural gas to run a heat pump b. or coal45. There is almost no hydrogen gas in the atmosphere because a. it escapes the earth’s gravity 46. The New Orleans levees failed because a. they were weaker at the thermal expansion joints 47. For a typical auto, the fraction of the gasoline energy wasted as heat is about (careful, this may be a trick question): a. 80% 48. At what temperature does ice melta. 0 c49. Temperature in the suna. is not well defined50. When material is coolera. some things contract and some expand51. The melting temperature of an object is usually a. equal to its freezing point 52. Absolute zero is the temperature of a. nothing b. or liquid helium53. When a liquid boils, the increase in volume (liquid to gas) is typically a factor of a. 1000 54. If the temperature of a gas in a container goes from 0 C to 300 C, the pressure willa. become 300 times greater 55. Fire walking is similar to a. water on a saucepan 56. For gasoline to explode, it requires a. to be mixed with oxygen 57. To be more efficient, the temperature difference (between the ignited hot fuel and the cool part of the engine) should be a. as large as possible 58. Heat flow through empty space (no atoms present) a. occurs through radiation59. Entropy (optional topic) measures a. disorder 60. At Mach 10, if all the energy of a meteorite went into heating it, its temperature would be about a. ( )100000 C b. or 3000061. If temperature rises by 5 C = 9 F, then the rise in sea level will be about a. 2 feet b. or 12 feet62. Molecular motion stops at a. 0 K 63. A table has the same temperature as the air above it. That means that the molecules in the air and in the table have a. The same average energy 64. a cup full of water and made of plastic feels warmer than one made of glass because: a. plastic conducts heat better than glass 65. Put hot glass in cool water. It shatters because a. the outer surface of the glass contracts rapidly, but the inner part doesn’t66. when a liquid boils, the increase in volume (liquid to gas) is typically a factor ofa. 100067. Energy in the Sun is produced primarily bya. Fusion68. The mass of the nucleus is closest toa. 99% of that in the entire atom69. Surprising


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FSU PHY 1020 - Chapter 1 Questions

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