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Chapter 4: Problem 12
How can you use the volume of some quantity of a pure substance to calculate its mass?
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Explain why a smoothly flowing stream of water from a faucet often gets progressively narrower in cross-section as the water falls (see o Figure 4.52).
When two trains, going in opposite directions, are passing on tracks that are laid out close together, the train cars can often be seen to be leaning in toward one another where they are in proximity. How might the air passing through the narrow gap separating the two trains contribute to the observed attraction between their cars?
Bicycle tires are often inflated to pressures as high as 75 psi, whereas automobile tires, which must support much heavier loads, are pumped to only 32 psi. Why is that? Explain.
Corrugated plastic pipes are commonly used to carry water away from the foundation areas of houses. These accordion-like pipes typically vary in diameter, alternating between smaller and larger widths, at regular intervals of a few centimeters or so, making them much more flexible than straight plastic pipes. Assuming the water in such pipes undergoes steady flow, describe the variations in the speed and pressure of the water as it moves along.
Describe the four phases of matter. Compare their external, observable properties. Compare the nature of the forces between atoms or molecules (or both) in the solid, liquid, and gas phases.
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