Determining the length of the curve (ln curve)

In summary, the conversation was about determining the length of a curve using a given formula. The formula was then used to set up an integral and the discussion ended with a correction to the expression for the arc length.
  • #1
Riazy
30
0

Homework Statement



Determining the length of the curve (ln curve)
{ x = 1 + t + 1 / t
y = 3-2 lnt

between 1<= t <= 2

Homework Equations



Well Using the formula L = $ (from a to b) SQRT[x'(t)]^2 + [y'(t)]^2] dt

The Attempt at a Solution



I have a problem to go further from here, could someone help solve this?
 
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  • #2
Using the formula you gave:

[tex]
L=\int_{1}^{2}\left(1-\frac{1}{t^{2}}\right)^{2}+\left(-\frac{2}{t}\right)^{2}dt
[/tex]

Expand and integrate...
 
  • #3
hunt_mat:

I think you left out that the integrand in your expression for the arc length should be under a square root sign.
 
  • #4
Your right, I have.
 

1. How do you determine the length of a ln curve?

The length of a ln curve can be determined by using the following formula: L = ∫√(1 + (dy/dx)^2)dx, where the integral is taken from the starting point of the curve to the end point.

2. Can the length of a ln curve be calculated using basic geometry principles?

No, the length of a ln curve cannot be calculated using basic geometry principles as it is a non-linear curve and requires integration to find the length.

3. Is it necessary to know the equation of the ln curve to determine its length?

Yes, knowing the equation of the ln curve is necessary as it is used to calculate the derivative (dy/dx) which is needed in the length formula.

4. Can the length of a ln curve be approximated using numerical methods?

Yes, the length of a ln curve can be approximated using numerical methods such as the trapezoidal rule or Simpson's rule. However, these methods may introduce some error in the calculation.

5. Are there any practical applications for determining the length of a ln curve?

Yes, determining the length of a ln curve has practical applications in fields such as physics, engineering, and economics. It is used to calculate the arc length of a curved path, which can be useful in understanding the motion of objects or predicting future trends in data.

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