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## Homework Statement

A small block of mass m is pressed up

against a spring. The spring has constant k

and is compressed a distance x. The block

slides along a track up and around a loop

of radius r and down and out on the far

side, as shown. At the top of the loop, the

loop exerts a normal force on the block

equal to the weight of the block. Neglect

friction.

Determine the compression distance, x, in terms of given quantities k, m, r and g.

## Homework Equations

U[tex]_{spring}[/tex] = 1/2kx[tex]^{2}[/tex]

KE = 1/2mv[tex]^{2}[/tex]

U[tex]_{grav}[/tex] = mgh

## The Attempt at a Solution

I started with energy conservation, but im not sure if you just set U[tex]_{spring}[/tex] equal to the sum of KE and U[tex]_{grav}[/tex]

The picture of the problem can be seen here: http://img137.imageshack.us/img137/7804/41935428tm6.th.jpg [Broken]

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