I hope that you've heard about Brachistochrone problem: http://mathworld.wolfram.com/BrachistochroneProblem.html(adsbygoogle = window.adsbygoogle || []).push({});

Given two points, I can find (calculate) the courve, on which the ball needs minimum time to travel from point 1 to point 2.

I get the equation for the courve, which is cycloid, in parametric form, let say:

[tex]

x(\theta)&=&C\left(\theta-\sin{\theta}\right),

[/tex]

[tex]

y(\theta)&=&-C\left(1-\cos{\theta}\right).

[/tex]

Now I also need to calculate the time needed...

How could I calculate it out of formula below using the equation for the courve/cycloid in parametric form?

[tex]t_{12}=\int_{T_1}^{T_2} \frac{\sqrt{1+{y'}^2}}{\sqrt{2g\,y}}dx, \quad y'=\frac{dy}{dx}[/tex]

Thanks for your answers!

Hriby

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# Time in brachistochrone problem

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