- #1

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## Homework Statement

When the train has passed at the point C, the radii of curvature is 20 m and the apparent weight is 2 2 times bigger than the real weight. At the moment when the picture was taken, the train was at the point s, located 8 m higher than the hollow C. At s, the radii of curvature est 16m. Calculate the quotient between the apparent weight at the point S and the real weight. There is no friction and no air resistance.

http://imgur.com/R2A4pya

## Homework Equations

Sum of force in y = (mv^2)/radii

Energy at s = energy s

k=mv^2/2

U=m*g*y

## The Attempt at a Solution

I know what to do :

I calculate the speed at the point C. I get 62,6 m/s

I put up equations which respect that Es=Ec to find my speed at S

I do the sum of forces at S and find n and divide it by mg.

Now, the only point which Im not sure is what is the height the point S ? I is 48 m ?