Chapter 12: Q3CQ (page 425)
Identify some substances that are incompressible and some that are not.
Oil in hydraulic brakes is incompressible. Gases under normal conditions are compressible.
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Water pressure inside a hose nozzle can be less than atmospheric pressure due to the Bernoulli effect. Explain in terms of energy how the water can emerge from the nozzle against the opposing atmospheric pressure.
The old rubber boot shown in Figure 12.26 has two leaks. To what maximum height can the water squirt from Leak 1? How does the velocity of water emerging from Leak 2 differ from that of leak 1? Explain your responses in terms of energy.
Is there a limit to the height to which an entrainment device can raise a fluid? Explain your answer.
Answer
Why would you expect the rate of diffusion to increase with temperature? Can you give an example, such as the fact that you can dissolve sugar more rapidly in hot water?
Will identical raindrops fall more rapidly in \(5{\rm{^\circ C}}\)air or \(25{\rm{^\circ C}}\)air, neglecting any differences in air density? Explain your answer.
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