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find the revolutions of a bicycle wheel of diameter 0.8m when the bike goes a distance of 25m down the street.

  • physics -

    Each revolution the wheel turns moves the bike forward by pi*D = 2.51 meters
    (unless the wheel is skidding).

    To go 25 meters, the number of wheel turns is therefore
    25/(pi*D) = 9.95

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