Chapter 10: Q5Q (page 260)
Will an ice cube float in a glass of alcohol? Why or why not?
No. The ice cube will not float in a glass of alcohol.
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If one material has a higher density than another, must the molecules of the first be heavier than those of the second? Explain.
When you ascend or descend a great deal when driving in a car, your ears “pop,” which means that the pressure behind the eardrum is being equalized to that outside? If this did not happen, what would be the approximate force on an eardrum of area \(0.20\;c{m^2}\)if a change in altitude of 1250 m takes place?
An airplane has a mass of \({\bf{1}}{\bf{.7 \times 1}}{{\bf{0}}^{\bf{6}}}\;{\bf{kg}}\) and the air flows past the lower surface of the wings at 95 m/s. If the wings have a surface area of \({\bf{1200}}\;{{\bf{m}}^{\bf{2}}}\), how fast must the air flow over the upper surface of the wing if the plane is to stay in the air?
(I) If you tried to smuggle gold bricks by filling your backpack, whose dimensions are 54cm× 31cm× 22cm what would its mass be?
A raft is made of 12 logs lashed together. Each is 45 cm in diameter and has a length of 6.5 m. How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 68 kg? Do not neglect the weight of the logs. Assume the specific gravity of wood is 0.60.
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