Problem Set 8
Due: see website for due date
Chapter 12: Thermal Properties of Matter
Questions: 1
Exercises & Problems: 9, 16, 62
Chapter 13: Fluids
Questions: 5, 6, 15
Exercises & Problems: 8, 14, 44
Q12.1: If you buy a sealed bag of potato chips in Miami and drive with it to Denver,
where the atmospheric pressure is lower, you will find that the bag gets very "puffy."
Explain why.
P12.9: Many cultures around the world still use a simple weapon called a blowgun, a
tube with a dart that fits tightly inside. A sharp breath into the end of the tube launches
the dart. When exhaling forcefully, a healthy person can supply air at a gauge pressure
of 6.0 kPa. What force does this pressure exert on a dart in a 1.5-cm-diameter tube?
P12.16: A cylinder contains 3.0 L of oxygen at 300 K and 2.4 atom. The gas is heated,
causing a piston in the cylinder to move outward. The heating causes the temperature to
rise to 600 K and the volume of the cylinder to increase to 9.0 L. What is the final gas
pressure?
P12.62: A 15-cm-diameter compressed-air tank is 50 cm tall. The pressure at 20oC is
150 atm.
a. How many moles of air are in the tank?
b. What volume would this air occupy at STP?
Q13.5: When you get a blood transfusion the bag of blood is held above your body, but
when you donate blood the collection bag is held below. Why is this?
Q13.6: To explore the bottom of a 10-m-deep lake, your friend Tom proposes to get a
long garden hose, put one end on land and the other in his mouth for breathing
underwater, and descend into the depths. Susan, who overhears the conversation,
reacts with horror and warns Tom that he will not be able to inhale when he is at the lake
bottom. Why is Susan so worried?
Q13.15: Helium-filled weather balloons are spherical when they reach very high
altitudes. However, they are only partially inflated with helium before they are released.
Explain why this is done.
P13.8: The deepest point in the ocean is 11 km below sea level, deeper than Mt.
Everest is tall. What is the pressure in atmospheres at this depth?
P13.14: The highest that George can suck water up a very long straw is 2.0 m. (This is a
typical value.) What is the lowest pressure that he can maintain in his mouth?
P13.44: The little Dutch boy saved Holland by sticking his finger in the leaking dike. If
the water level is 2.5 m above his finger, estimate the force of the water on his finger.
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