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Chapter 14: Q.13 (page 384)
What is the height of a water barometer at atmospheric
pressure?
The height is 10.34 m
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A large 10,000 L aquarium is supported by four wood posts (Douglas fir) at the corners. Each post has a square 4.0 cm * 4.0 cm cross-section and is 80 cm tall. By how much is each post compressed by the weight of the aquarium?
A 20-cm-diameter circular cover is placed over a 10-cm-diameter hole that leads into an evacuated chamber. The pressure in the chamber is 20 kPa. How much force is required to pull the cover off?
Gas flows through the pipe of FIGURE Q14.10. You can’t see into the pipe to know how the inner diameter changes. Rank in order, from largest to smallest, the gas speeds va , vb , and vc at points a, b, and c. Explain.
A friend asks you how much pressure is in your car tires. You know that the tire manufacturer recommends , but it's been a while since you've checked. You can't find a tire gauge in the car, but you do find the owner's manual and a ruler. Fortunately, you've just finished taking physics, so you tell your friend, "I don't know, but I can figure it out." From the owner's manual you find that the car's mass is. It seems reasonable to assume that each tire supports one-fourth of the weight. With the ruler you find that the tires are wide and the flattened segment of the tire in contact with the road is long. What answer-in psi-will you give your friend?
An object has density ρ.
a. Suppose each of the object’s three dimensions is increased by a factor of 2 without changing the material of which the object is made. Will the density change? If so, by what factor? Explain.
b. Suppose each of the object’s three dimensions is increased by a factor of 2 without changing the object’s mass. Will the density change? If so, by what factor? Explain.
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