Physics
posted by Sam .
An automobile with 0.310 m radius tires travels 85,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?

Physics 
Henry
Circumference = pi * 2r = 3.14 * 0.620 =
1.95 m/rev.
8.5*10^7m * 1rev/1.95m = 4.36*10^7 Revs
= 43.6 Million Revs.
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