Chapter 10: Q2P (page 260)
(I) What is the approximate mass of air in a living room 5.6× 3.6× 2.4m?
The mass of the air is 62.4 Kg.
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(I)Calculate the average speed of blood flow in the major arteries of the body, which have a total cross-sectional area of about \(2.0\;{\rm{c}}{{\rm{m}}^2}\). Use the data of Example 10–12.
(II)A 180 km/h wind blowing over the flat roof of a house causes the roof to lift off the house. If the house is\(6.2\;{\rm{m}} \times {\rm{12}}{\rm{.4}}\;{\rm{m}}\)in size, estimate the weight of the roof. Assume the roof is not nailed down.
A submerged can of Coke sink, but a can of Diet Coke will float. (Try it!) Explain.
If you dangle two pieces of paper vertically, a few inches apart (Fig. 10–44), and blow between them, how do you think the papers will move? Try it and see. Explain.
(II) In a movie, Tarzan evades his captors by hiding underwater for many minutes while breathing through a long, thin reed. Assuming the maximum pressure difference his lungs can manage and still breathe is –85 mm-Hg, calculate the deepest he could have been.
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