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Math Help - civil engineering

  1. #1
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    Red face civil engineering

    highway curves.... proper banking angle, theta, for a car making a turn of radius, r feet at a velocity v feet per second is given by tan theta = v^2 /gr, where g is the acceleration due to gravity. assume g = 32 ft/s^2. an engineer is designing a curve with a radius of 1000 feet. if the speed limit on the curve will be 55mph, at what angle should the curve be banked?
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  2. #2
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    Quote Originally Posted by mathAna1ys!5
    highway curves.... proper banking angle, theta, for a car making a turn of radius, r feet at a velocity v feet per second is given by tan theta = v^2 /gr, where g is the acceleration due to gravity. assume g = 32 ft/s^2. an engineer is designing a curve with a radius of 1000 feet. if the speed limit on the curve will be 55mph, at what angle should the curve be banked?
    Substitute that infromation in to the equation (wonder if this equation is true )
    \tan\theta=\frac{v^2}{gr}
    Thus,
    (g,r)=(32,1000)
    However, v must be converted to feet per second,
    55\frac{\mbox{miles}}{\mbox{hour}}=55\frac{\mbox{5  ,280 feet}}{\mbox{3600 seconds}}=80.\bar 6
    Thus,
    \tan\theta=\frac{(80.\bar 6)^2}{32\times 1000}\approx .203
    Thus, (use arctan)
    \theta \approx 11.5
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  3. #3
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    ty

    I had another problem like this and was able to solve it just fine. thanks for the help.
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  4. #4
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    Welcome, I can see you do not like trigonometry that much.
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