Chapter 10: Q11Q (page 260)
Why do you float higher in salt water than in freshwater?
The density of salt water is higher than freshwater. The displaced water in salt is less than the fresh water. The buoyant force is higher in saltwater than the freshwater.
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(II) If the base of an insect’s leg has a radius of about \(3.0 \times 1{0^{{\bf{ - }}5}}\;m\) and the insect’s mass is 0.016 g, would you expect the six-legged insect to remain on top of the water? Why or why not?
(II) Calculate the pressure drop per cm along the aorta using the data of Example 10–12 and Table 10–3.
Roofs of houses are sometimes “blown” off (or are they pushed off?) during a tornado or hurricane. Explain using Bernoulli’s principle.
Consider what happens when you push both a pin and the blunt end of a pen against your skin with the same force. Decide what determines whether your skin is cut—the net force applied to it or the pressure.
Will an empty balloon have precisely the same apparent weight on a scale as a balloon filled with air? Explain.
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