Posted by **CJ** on Wednesday, March 14, 2007 at 3:55am.

The warranty on a new tire says that an automobile can travel for a distance of 92,000km before the tire wears out. The radius of the tire is 0.33m. How many revolutions does the tire make before wearing out?

hello CJ I think we are in the same class. I had sent you an e-mail.

92,000*10^3 m = N * (tire circumference)

= 2*pi*R N = 9.2*10^7.

Solve for the number of turns, N.

R is the radius in meters

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