47 Think about what happens to the volume of an air filled balloon on top of water and beneath the water surface Then rank the buoyant force on a weighted balloon in water, from most to least, when it is a barely floating with its top at the surface b pushed 1 m beneath the surface c pushed 2 m beneath the surface 50 Which is more likely to hurtbeing stepped on by a 200 lb man wearing loafers or by a 100 lb woman wearing high heels Why 53 Why is blood pressure measured in the upper arm, at the elevation of your heart 58 A block of aluminum with a volume of 10cm3 is placed in a beaker of water filled to the brim Water overflows The same is done in another beaker with a 10 cm3 block of lead Does the lead displace more, less, or the same amount of water as the aluminum does 59 A block of aluminum with a mass of 1 kg is placed in a beaker of water filled to the brim Water overflows The same is done in another beaker with a 1 kg block of lead Does the lead displace more, less, or the same amount of water as the aluminum does 68 Why will a block of iron float in mercury but sink in water 79 A ship sailing from the ocean into a freshwater harbor sinks slightly deeper into the water Does the buoyant force on the ship change If so, does it increase or decrease 83 When the wooden block is placed in the beaker, what happens to the cale reading Answer the same question for an iron block 90 If you release a ping pong ball beneath the surface of water, it will rise to the surface Would it do the same if it were inside a big blob of water floating weightless in an orbiting spacecraft 95 Why can't a heavy paper clip rest on the surface of still water like a small dry paper clip without sinking 47 How does atmospheric pressure at the bottom of a deep well compare to normal atmospheric pressure Defend your answer 49 Why is a soft, underinflated football at sea level much firmer when it is at a high elevation in the mountains 51 How does the air density in a deep mine compare with the air density at Earth's surface Why is this so 52 When an air bubble rises in water, what happens to its mass, volume, and density 61 Would it be slightly more difficult to drink soda through a straw at sea level or on top of a very high mountain Or the same Defend your answer 65 When you replace helium in a balloon with less dense hydrogen, does the buoyant force on the balloon change if the balloon remains the same size Explain 67 What change in pressure occurs in a party balloon that is squeezed to one third its volume with no change in temperature 69 What happens to the speed of water ejected from a hose when you squeeze the opening and make it smaller 73 When a steadily flowing gas flows from a larger diameter pipe to a smaller diameter pipe, what happens to (a) its speed, (b) its pressure, and (c) the spacing between its streamlines 39 Rank the magnitudes of these units of thermal energy from greatest to least a 1 calorie b 1 Calorie c 1 joule 45 Which is greater an increase in temperature of 1 Celsius degree or an increase of 1 Fahrenheit degree 48 In a glass of water at room temperature, do 2all the molecules have the same speed Explain why, or why not 50 Which has the greater amount of internal energy an iceberg or a cup of hot coffee Defend your answer 54 Adding the same amount of heat to two different objects of the same mass does not necessarily produce the same increase in temperature Why not 59 A certain quantity of heat is supplied to both a kilogram of water and to a kilogram of iron Which undergoes the greater change in temperature Defend your answer 61 When a 1 kg metal pan containing 1 kg of cold water is removed from the refrigerator and set on a table, which absorbs more heat from the room the pan or the water Why 67 Desert sand is very hot in the day and very cool at night What does this indicate about its specific heat capacity 74 In terms of thermal expansion, why is it important that a key and its lock be made of the same or similar materials 87 A canister contains a mixture of hydrogen and oxygen gases at the same temperature Which molecules move faster, and, why 40 If you touch the metal sides inside of a hot oven with your bare hand, you're in trouble But hold your hand briefly in the oven air and you're okay What does this tell you about the relative conductivities of metal and air 44 Wrap a fur coat around a thermometer Will the temperature rise 54 Can heat spontaneously flow from an object with less internal energy to one with greater internal energy Defend your answer 55 Why is it incorrect to say that when a hot object warms a cold object, temperature flows between them 61 While drinking iced tea, a friend remarks that cooling would be less if ice cubes were instead on the bottom of the drink Do you agree or disagree Explain 63 Air density is normally less above any point in air than below In what sense does this provide an upward migration window in air How does this affect the convection of faster moving molecules in air 67 To save energy, some ceiling fans are reversible so that they drive air down or pull it up In which direction should the fan drive the air during winter In which direction for summer 74 Even though metal is a good conductor, frost can be seen on parked cars in the early morning even when the air temperature is above freezing Provide an explanation 78 On a very cold sunny day, you wear a black coat and a transparent raincoat Which coat should be worn on the outside for maximum warmth 80 Why is the insulation in an attic commonly thicker than the insulation in the walls of a house

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47. Think about what happens to the volume of an air-filled balloon on top of water and beneath the water surface. Then rank the buoyant

47. Think about what happens to the volume of an air-filled balloon on top of water and beneath the water surface. Then rank the buoyant force on a weighted balloon in water, from most to least, when it is
1. a. barely floating with its top at the surface.
2. b. pushed 1 m beneath the surface.
3. c. pushed 2 m beneath the surface.
50. Which is more likely to hurtbeing stepped on by a 200-lb man wearing loafers or by a 100-lb woman wearing high heels? Why?
53. Why is blood pressure measured in the upper arm, at the elevation of your heart?
58. A block of aluminum with a volume of 10cm3 is placed in a beaker of water filled to the brim. Water overflows. The same is done in another beaker with a 10-cm3 block of lead. Does the lead displace more, less, or the same amount of water as the aluminum does?
59. A block of aluminum with a mass of 1 kg is placed in a beaker of water filled to the brim. Water overflows. The same is done in another beaker with a 1-kg block of lead. Does the lead displace more, less, or the same amount of water as the aluminum does?
68. Why will a block of iron float in mercury but sink in water?
79. A ship sailing from the ocean into a freshwater harbor sinks slightly deeper into the water. Does the buoyant force on the ship change? If so, does it increase or decrease?
83. When the wooden block is placed in the beaker, what happens to the cale reading? Answer the same question for an iron block.
90. If you release a ping-pong ball beneath the surface of water, it will rise to the surface. Would it do the same if it were inside a big blob of water floating weightless in an orbiting spacecraft?
95. Why can't a heavy paper clip rest on the surface of still water like a small dry paper clip without sinking?
47. How does atmospheric pressure at the bottom of a deep well compare to normal atmospheric pressure? Defend your answer.
49. Why is a soft, underinflated football at sea level much firmer when it is at a high elevation in the mountains?
51. How does the air density in a deep mine compare with the air density at Earth's surface? Why is this so?
52. When an air bubble rises in water, what happens to its mass, volume, and density?
61. Would it be slightly more difficult to drink soda through a straw at sea level or on top of a very high mountain? Or the same? Defend your answer.
65. When you replace helium in a balloon with less-dense hydrogen, does the buoyant force on the balloon change if the balloon remains the same size? Explain.
67. What change in pressure occurs in a party balloon that is squeezed to one-third its volume with no change in temperature?
69. What happens to the speed of water ejected from a hose when you squeeze the opening and make it smaller?
73. When a steadily flowing gas flows from a larger-diameter pipe to a smaller-diameter pipe, what happens to (a) its speed, (b) its pressure, and (c) the spacing between its streamlines?
39. Rank the magnitudes of these units of thermal energy from greatest to least.
1. a. 1 calorie
2. b. 1 Calorie
3. c. 1 joule
45. Which is greater: an increase in temperature of 1 Celsius degree or an increase of 1 Fahrenheit degree?
48. In a glass of water at room temperature, do 2all the molecules have the same speed? Explain why, or why not.
50. Which has the greater amount of internal energy: an iceberg or a cup of hot coffee? Defend your answer.
54. Adding the same amount of heat to two different objects of the same mass does not necessarily produce the same increase in temperature. Why not?
59. A certain quantity of heat is supplied to both a kilogram of water and to a kilogram of iron. Which undergoes the greater change in temperature? Defend your answer.
61. When a 1-kg metal pan containing 1 kg of cold water is removed from the refrigerator and set on a table, which absorbs more heat from the room: the pan or the water? Why?
67. Desert sand is very hot in the day and very cool at night. What does this indicate about its specific heat capacity?
74. In terms of thermal expansion, why is it important that a key and its lock be made of the same or similar materials?
87. A canister contains a mixture of hydrogen and oxygen gases at the same temperature. Which molecules move faster, and, why?
40. If you touch the metal sides inside of a hot oven with your bare hand, you're in trouble. But hold your hand briefly in the oven air and you're okay. What does this tell you about the relative conductivities of metal and air?
44. Wrap a fur coat around a thermometer. Will the temperature rise?
54. Can heat spontaneously flow from an object with less internal energy to one with greater internal energy? Defend your answer.
55. Why is it incorrect to say that when a hot object warms a cold object, temperature flows between them?
61. While drinking iced tea, a friend remarks that cooling would be less if ice cubes were instead on the bottom of the drink. Do you agree or disagree? Explain.
63. Air density is normally less above any point in air than below. In what sense does this provide an upward "migration window" in air? How does this affect the convection of faster-moving molecules in air?
67. To save energy, some ceiling fans are reversible so that they drive air down or pull it up. In which direction should the fan drive the air during winter? In which direction for summer?
74. Even though metal is a good conductor, frost can be seen on parked cars in the early morning even when the air temperature is above freezing. Provide an explanation.
78. On a very cold sunny day, you wear a black coat and a transparent raincoat. Which coat should be worn on the outside for maximum warmth?
80. Why is the insulation in an attic commonly thicker than the insulation in the walls of a house?