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 scale 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 54 Trucks often have signs on their back ends that say, If you can't see my mirrors, I can't see you Explain the physics here 58 When you look at yourself in the mirror and wave your right hand, your beautiful image waves the left hand Then why don't the feet of your image wiggle when you shake your head 60 What must be the minimum length of a plane mirror in order for you to see a full image of yourself 69 During a lunar eclipse, the Moon is not completely dark but is usually reddish in color, discussed in the previous chapter Explain this in terms of the refraction of all the sunsets and sunrises around the world 88 89 The law of reflection does not apply to curved mirrors But in a limited sense, the law of reflection does apply Discuss how this is so 90 To reduce glare from the surroundings, the windows of some department stores, rather than being vertical, slant inward at the bottom Discuss why this reduces glare 95 A beam of light bends as shown in (a), while the edges of the immersed square bend as shown in (b) Do these pictures contradict each other Explain

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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 scale 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?
54. Trucks often have signs on their back ends that say, "If you can't see my mirrors, I can't see you." Explain the physics here.
58. When you look at yourself in the mirror and wave your right hand, your beautiful image waves the left hand. Then why don't the feet of your image wiggle when you shake your head?
60. What must be the minimum length of a plane mirror in order for you to see a full image of yourself?
69. During a lunar eclipse, the Moon is not completely dark but is usually reddish in color, discussed in the previous chapter. Explain this in terms of the refraction of all the sunsets and sunrises around the world.88.
89. The law of reflection does not apply to curved mirrors. But in a limited sense, the law of reflection does apply. Discuss how this is so.
90. To reduce glare from the surroundings, the windows of some department stores, rather than being vertical, slant inward at the bottom. Discuss why this reduces glare.
95. A beam of light bends as shown in (a), while the edges of the immersed square bend as shown in (b). Do these pictures contradict each other? Explain.