Shortest Distance on a Parabola: Point to Point Calculation

  • Thread starter karisrou
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In summary, to find the shortest distance from the point (1,4) to a point on the parabola y^2 = 2x, you can solve for x and find the tangent to the curve at x. Then, using the point slope formula, solve for x. This will result in the answer being sqrt(5). Another approach is to think of this as a minimization problem and use the formula for distance between two points to write it in terms of one variable, using the relationship between x and y. From there, you can find the minimum distance.
  • #1
karisrou
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2. Find the shortest distance from the point (1,4) to a point on the parabola y^2 = 2x

Not really sure what to do here next. I'd imagine i might have to fuse implicit differentiation? But not really sure.
 
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  • #2
1) solve for x
2) find tangent to curve at x
3) use point slope formula
4) solve for x

your ans should be sqrt(5)
 
  • #3
I'm kind of confused on step 2. How do you find the tangent?
 
  • #4
you know the x point so find its derivative and use the point slope formula and solve for x
 
  • #5
I still don't really understand. Do you think you can show it?
 
  • #6
There are multiple ways to solve this problem. One way is to think about this as an minimization problem. Hint: Let (x,y) be the point on the parabola closest to (1,4) and write out the formula for the distance between these two points. Next, use the relationship between x and y to write the formula in terms of one variable. Now what do you think you should do?
 

1. How is distance calculated on a parabola?

Distance on a parabola is calculated using the Pythagorean theorem, which states that the square of the hypotenuse (longest side) of a right triangle is equal to the sum of the squares of the other two sides. In this case, the parabola serves as the hypotenuse, and the distance is calculated by finding the length of the two sides of the triangle formed by the point on the parabola and the x and y axes.

2. Can distance on a parabola be negative?

Yes, distance on a parabola can be negative. This occurs when the point on the parabola is located below the x-axis, resulting in a negative y-value. The distance is still calculated using the Pythagorean theorem, but the negative value indicates that the point is below the x-axis.

3. How does the equation of a parabola affect distance calculations?

The equation of a parabola can affect distance calculations by determining the shape and position of the parabola. A parabola with a wider opening will have a larger distance, while a parabola with a narrower opening will have a smaller distance. Additionally, the position of the parabola can affect the distance calculations, as the distance may be measured from the vertex or the focus of the parabola.

4. Can distance on a parabola be measured in units other than length?

Yes, distance on a parabola can be measured in units other than length. For example, if the parabola represents the path of a projectile, the distance can be measured in time or velocity. In this case, the distance would be calculated by finding the time or velocity at which the point on the parabola is located.

5. How is distance on a parabola used in real-world applications?

Distance on a parabola has many real-world applications, particularly in physics and engineering. For example, it can be used to calculate the trajectory of a projectile, such as a thrown ball or a launched rocket. It can also be used to determine the optimal path for a satellite or a roller coaster. Additionally, distance on a parabola is used in computer graphics and animation to create realistic motion and effects.

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