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Math Help - please help with this problem

  1. #1
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    please help with this problem

    If I am riding my push mountain bike at 25 km/h, and my tyre radius is 30.5 cm.

    How many revolutions per minute are my wheels travelling at?
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  2. #2
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    Re: please help with this problem

    Quote Originally Posted by mathkid182 View Post
    If I am riding my push mountain bike at 25 km/h, and my tyre radius is 30.5 cm.

    How many revolutions per minute are my wheels travelling at?
    25 \quad\text{km/h}= \frac{25000 \quad\text{m}}{60 \quad\text{mins}} = 416.\dot{6}\,\,\text{m/min}

    1 revolution of the wheel covers 2\pi r= 2\pi(0.305)=1.9163...\text{m} so \416.\dot{6}\,\,\text{m}=\frac{416.\dot{6}}{1.9}\,  \,\text{revs}
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