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1
Ivy Bucsa
PHY=102
August 17, 2014
Lillian Flakes
Chapter 5,6 and 7 Assignments
Chapter 5
Plug and Chug
49. The depth of water behind the Hoover Dam is 220 m.
Show that the water pressure at the base of this dam is
2160 kPa
Think and Solve
51. Suppose you balance a 2-kg ball on the tip of your finger,
which has an area of 1 cm2. Show that the pressure on
your finger is 20 N/cm2, or is 200 kPa.
Exercises
74. Stand on a bathroom scale and read your weight. When
you lift one foot up so you’re standing on one foot, does
the reading change? Does a scale read force or pressure?
91. The “pump” in a vacuum cleaner is merely a high-speed
fan. Would a vacuum cleaner pick up dust from a rug on
the Moon? Explain
94. Your friend says that the buoyant force of the atmosphere
on an elephant is significantly greater than the buoyant
force of the atmosphere on a small helium-filled balloon.
What do you say?
101. The force of the atmosphere at sea level against the outside
of a 10@m2 store window is about 1 million N. Why
doesn’t this shatter the window? Why might the window
shatter in a strong wind blowing past?
Discussion Questions
108. The photo shows physics
teacher Marshall Ellenstein
walking barefoot
on broken glass bottles
in his class. What physics
concept is Marshall
demonstrating, and why
is he careful that the broken
pieces are small and
numerous? (The Band-
Aids on his feet are for
Humor
114. If liquid pressure were the same at all depths, would there
be a buoyant force on an object submerged in the liquid?
Discuss your explanation of this with your friends
Chapter 6 Review
Think and Rank
47. The precise volume of water in a beaker depends on the
temperature of the water. Rank from greatest to least the
volume of water at these temperatures: (a) 0°C, (b) 4°C,
and (c) 10°C55. After a car is driven along a road for some distance, why
does the air pressure in the tires increase?
E55. After a car is driven along a road for some distance, why
does the air pressure in the tires increase?xercises
Discussion Questions
77. On cold winter nights in days past, it was common to bring
a hot object to bed with you. Which would keep you warmer
through the cold night: a 10-kg iron brick or a 10-kg jug of
hot water at the same high temperature? Explain.
78. Why does the presence of large bodies of water tend to
moderate the climate of nearby land—making it warmer
in cold weather and cooler in hot weather?
Chapter 7 Review
Think and Solve
Exercises
60. What is the purpose of the copper or aluminum layer on
the bottom of a stainless-steel pot?
62. Many tongues have been injured by licking a piece of
metal on a very cold day. Why would no harm result if a
piece of wood were licked on the same day?
81. Why does wrapping a bottled beverage in a wet cloth at
a picnic often produce a cooler bottle than placing the
bottle in a bucket of cold water?
85. When boiling spaghetti, is your cooking time reduced if
the water is vigorously boiling instead of gently boiling
Discussiom Questions
97. When you are near an incandescent lamp, turn it on
and off quickly. You feel its heat, but you find when you
touch the bulb that it is not hot. Explain why you felt
heat from the lamp.
109. Why is a tub of water placed in a farmer’s canning cellar
in cold winters to help prevent canned food from
freezing?
110. Why does spraying fruit trees with water before a frost
help protect the fruit from freezing?
Paper must be finished in ApA format Times Roman 12 I do not know how to send illustrations from my textbook. Sorry for the inconvience!!
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