# Answer to Question #10082 in Mechanics | Relativity for Simona

Question #10082

An automobile tire is rated to last 35,000 miles. Estimate the number of revolutions the tire will make in its lifetime?

Expert's answer

Let the tire radius be r feets. Then the length of tire circumference is L = 2πr. So, the tire makes

N =& 35000*5280/(2πr) = 924*10^5/(πr)

revolutions before wearing out.

N =& 35000*5280/(2πr) = 924*10^5/(πr)

revolutions before wearing out.

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