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Thread: circles

  1. #1
    Junior Member
    Feb 2007


    A water irrigation arm 500 meters long rotates around a pivot P once every day. How far does the tip of the arm travel in one minute? to the nearest minute.

    so this is how I had solved it

    s=1/2 0r^2
    - 1/2 *2Pi/1440*500^2

    i chose 2Pi/1440 because that is how many minutes are in a day. the answer that I get is 5140cm any help would be nice thank you
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  2. #2
    MHF Contributor
    Apr 2008
    Actually the arc length $\displaystyle s = \theta{r}$.

    Your angle is correct but you should recalculate s using the correct formula.
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