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Math Help - Heeeeelp Urgent

  1. #1
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    Exclamation Heeeeelp Urgent

    Hey i have a question for Maths B in queensland, australia. Here it is...

    Water flows in and out of a tidal pool according to the equation:

    g = 50SIN((2π/6)x)

    Where g is the flow of water in cubic meters per hour and x is the time in hours. At g=0, the water flow is 0. Greenies who are protesting about water quality begin measuring the flow into and out of the pond 3 hours after g=0. Over a certain period of time approximately 119 cubic metres of water was measured. For how long was the flow measured?

    Any help here would be appreciated
    Cheers
    Ned

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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Ned Hunter View Post
    Hey i have a question for Maths B in queensland, australia. Here it is...

    Water flows in and out of a tidal pool according to the equation:

    g = 50SIN((2π/6)x)

    Where g is the flow of water in cubic meters per hour and x is the time in hours. At g=0, the water flow is 0. Greenies who are protesting about water quality begin measuring the flow into and out of the pond 3 hours after g=0. Over a certain period of time approximately 119 cubic metres of water was measured. For how long was the flow measured?

    Any help here would be appreciated
    Cheers
    Ned
    substitute g = 119 and solve for x

    So you need to find x such that:

    119 = 50 \sin \left( \frac {2 \pi}{6}x\right)

    now continue

    EDIT: and of course you would have to subtract 3 from the answer above, since they started measuring 3 hours after the flow started
    Last edited by Jhevon; September 2nd 2007 at 09:37 PM.
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