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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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What direction will a helium balloon move inside a car that is slowing down—toward the front or back? Explain your answer.
Some ceiling fans have decorative wicker reeds on their blades. Discuss whether these fans are as quiet and efficient as those with smooth blades.
Sink drains often have a device such as that shown in Figure 12.28 to help speed the flow of water. How does this work?
Based on Bernoulli’s equation, what are three forms of energy in a fluid? (Note that these forms are conservative, unlike heat transfer and other dissipative forms not included in Bernoulli’s equation.)
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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