A. What is the air pressure inside the tire of your bike (or that of a friend)?

Question

A. What is the air pressure inside the tire of your bike (or that of a friend)? Use this number
to predict how much surface area of the tire will be in contact with the ground when you are
sitting on the bike and when you are not sitting on it.
B. Explain what is meant by a part per million. What is the approximate concentration of
dishwashing detergent in ppm when you do dishes? Suppose that you want to reduce the
concentration to 1 part per trillion of detergent in water in the drops that stay on the glass
when you put it in the dish drainer. Estimate how many rinses would it take to do this and
explain your answer. Explain in general how rinsing stuff off works.
C. How would you find the surface area of basketball without using a ruler or any other linear
measurement device? What about a football? What about the surface area of your skin?

Explanation / Answer

You need to ask this as different questions.

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