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Chapter 11: Q5CQ (page 394)
Approximately how does the density of air vary with altitude?
Air density is less at higher altitudes.
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Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area of the tires in contact with the ground. The bicycle plus rider has a mass of, and the gauge pressure in the tires is.
Suppose the master cylinder in a hydraulic system is at a greater height than the slave cylinder. Explain how this will affect the force produced at the slave cylinder.
A full-term fetus typically has a mass of\[{\rm{3}}{\rm{.50 kg}}\]. (a) What pressure does the weight of such a foetus create if it rests on the mother’s bladder, supported on an area of\[{\rm{90}}{\rm{.0 c}}{{\rm{m}}^{\rm{2}}}\]? (b) Convert this pressure to millimetres of mercury and determine if it alone is great enough to trigger the micturition reflex (it will add to any pressure already existing in the bladder).
Gold is sold by the troy ounce . What is the volume oftroyounce of pure gold?
Consider a group of people trying to stay afloat after their boat strikes a log in a lake. Construct a problem in which you calculate the number of people that can cling to the log and keep their heads out of the water. Among the variables to be considered are the size and density of the log, and what is needed to keep a person’s head and arms above water without swimming or treading water.
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