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Posted by on Monday, March 17, 2014 at 10:10pm.

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 - , Wednesday, March 19, 2014 at 4:40pm

    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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