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1.31. Set Up:
An average middleaged (40 yearold) adult at rest has a heart rate of roughly 75 beats per minute.
To calculate the number of beats in a lifetime, use the current average lifespan of 80 years. The volume of blood
pumped during this interval is then the volume per beat multiplied by the total beats.
Solve:
1.32. Set Up:
Estimate that one step is
Estimate that you walk 100 m in 1 minute. The distance to the Moon is
Solve:
The time it takes is
which is about 7 years. The number of steps would be:
1.33. Set Up:
The cost would equal the number of dollar bills required; the surface area of the U.S. divided by the
surface area of a single dollar bill. By drawing a rectangle on a map of the U.S., the approximate area is 2600 mi by
1300 mi or 3,380,000
This estimate is within 10 percent of the actual area, 3,794,083
The population is
roughly
while the area of a dollar bill, as measured with a ruler, is approximately
in. by
in.
Solve:
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 Spring '07
 Shoberg
 Current

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