Quadratics in the Real WorldDate: 07/30/98 at 09:19:53 From: Eric Makhni Subject: Quadratics in the real world Hi, I am participating in a math contest, and I am making a speech about quadratics on the pre-calculus level. I am going to speak on "Quadratics: How Do They Help Us In the Outside World?" and I have been looking for information. Thanks, Eric M. Date: 07/31/98 at 22:14:02 From: Doctor Jeremiah Subject: Re: Quadratics in the real world Hi Eric: Quadratics are used in the real world. Even NASA uses quadratics when they hurl rockets into space. One example of a quadratic is a parabola. It is a quadratic because the highest power term in the equation of a parabola has an exponent equal to 2. An example of a quadratic that is a parabola is: x = c + b * x + a * x^2 <== notice the exponent If we use different letters we get: y = D + V * t + A/2 * t^2 which is the equation for the distance that something will move vertically when rising against gravity. So if you wanted to know how high a rocket would go (to determine if it would make it to outer space) you would use a quadratic like that one. In the equation y = D + V * t + 1/2 * A * t^2: y is the vertical distance t is the length of time D is the starting distance (perhaps 0) V is the starting vertical velocity (perhaps 0) A is the acceleration The acceleration A would be the rocket's acceleration minus the Earth's acceleration. I hope that gives you a good example. If you need more information mail back and I will try to help. - Doctor Jeremiah, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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