- #1

TFM

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## Homework Statement

Mass of rod: M

mass of ball: m

Length of Rod: L

distance between rod and ball: x

GPE is zero at infinty

The questiopn asks to take the GPE of the rod/ball system, using the Power Series Expansion for ln(1+x) .

## Homework Equations

U = -GMm/r

## The Attempt at a Solution

I'm not quite sure where to start - the Power Series expansion has confused me slightly, as otherwise I wouold hqave just put the variables in the above equation?

TFM