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March 27, 2017

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The diameter of a car tire is approximately 0.6meters. The warranty is good for 70,000 km. About how many revolutions will the tire make before the warranty is up? More than a million? a billion?

----------------------- my work
c=pi*d
c=3.14*0.6
c=1.884 meters

1km=1000 meters
so 1.884 divided by 1000 = 0.001884 km?

So more than a billion revolutions? Is this correct?

  • Geometry check my answer? - ,

    70,000 = 7*10^4 km *10^3 m/km = 7*10^7 meters
    7*10^7 meters/1.884 meters/rev = 3.72*10^7 rev

    37,200,000 revolutions

    37 million and 200 thousand

  • Geometry check my answer? - ,

    What does ^ mean?

  • Geometry check my answer? - ,

    ^ means exponent
    2^2 = 2 to the 2 power or squared
    2^3 = 8
    2^4 = 16 etc

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