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Math Help - Trigonometric modelling

  1. #1
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    Trigonometric modelling

    All help much appreciated, sorry for poor set out of equation.

    The height of water(h metres) on a pier pylon is given by:
    h=2sin((pi/12)*t)+4, where t is given in hours after midday.What is the height of the water at:
    a)2pm
    b)6am the next morning
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  2. #2
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    May 2008
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    Quote Originally Posted by ollieman View Post
    All help much appreciated, sorry for poor set out of equation.

    The height of water(h metres) on a pier pylon is given by:
    h=2sin((pi/12)*t)+4, where t is given in hours after midday.What is the height of the water at:
    a)2pm
    b)6am the next morning
    2pm is 2 hours after midday so t=2
    giving us
    h=2\sin (\frac{\pi}{6})+4

    h=2(\frac{1}{2})+4=5

    I'll leave you to do b, but remember at 6am the next morning it going to be 18 hours after midday
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