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Chapter 1: Q42. (page 19)
A typical adult human lung contains about 300 million tiny cavities called alveoli. Estimate the average diameter of a single alveolus.
The average diameter of a single alveolus is 0.234 mm.
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How big is a ton? That is, what is the volume of something that weighs a ton? To be specific, estimate the diameter of a 1-ton rock, but first make a wild guess: will it be 1 ft across, 3 ft, or the size of a car? [Hint: Rock has mass per volume about 3 times that of water, which is 1 kg per literor 62 lb per cubic foot.]
A watch manufacturer claims that its watches gain or lose no more than 8 seconds in a year. How accurate are these watches, expressed as a percentage?
Accuracy represents
(a) repeatability of a measurement, using a given instrument
(b) how close a measurement is to the true value
(c) an ideal number of measurements to make
(d) how poorly an instrument is operating
I agree to hire you for 30 days. You can decide between two methods of payments: either (1) $1000 a day, or (2) one penny on the first day, two pennies on the second day, and continue to double your daily pay each day up to day 30. Use quick estimation to make your decision, and justify it.
The following formula estimates an average person鈥檚 lung capacity V(in litres, where):
,
Where H and A are the person鈥檚 height (in metres) and age (in years) respectively. In this formula, what are the units of the numbers 4.1, 0.018, and 2.7?
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