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Subject: conics


Author:
cheekz
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Date Posted: 15:02:13 01/18/04 Sun

The cables of the suspension bridge hang in a curve that approximates a parabola. The road passes through the vertex. The supporting towers are 550 m apart and 50 m high. Write and equation for the parabola

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[> Subject: Re: conics


Author:
QUITTNER
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Date Posted: 12:37:21 01/19/04 Mon

>>> The cables of the suspension bridge hang in a curve that approximates a parabola. The road passes through the vertex. The supporting towers are 550 m apart and 50 m high. Write and equation for the parabola. <<<
..... Assuming that the vertex is at the origin (0,0), the equation of the parabola is
y^2 = 2 a x - Find a
..... The vertex is where the cables hit the road level, and it's a symmetic graph. The top of the tower on the right is at (275,50). Substitute into the equation to find a.

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