# Node voltage analysis

1. Jun 6, 2010

### bon

1. The problem statement, all variables and given/known data

A satellite is in circular orbit of radius R about a star of mass M . The star
suddenly undergoes an explosion in which one percent of its mass is blown spherically
symmetrically to a large distance. What are the new nearest and furthest distances of
the satellite’s orbit around the star?

2. Relevant equations

3. The attempt at a solution

Am i right in thinking that both the angular momentum and energy of the star decrease..the new J = 0.99mrv and the new KE = 1/2 (0.99m)v^2? Same PE?

2. Jun 6, 2010

### ehild

Re: orbits

Why should either the KE or the angular momentum of the satellite change? Did any force do any work on it? Or the force field ceased to be central?

ehild

3. Jun 6, 2010

### bon

Re: orbits

it's mass changed! - i.e. the total PE and KE of remaining satellite + parts blown away is unchanged, yes..but surely the KE of the remaining bit of satellite decreases as its mass is less...?

Otherwise there would be no max/min distances that it asks us to calculate..

4. Jun 6, 2010

Re: orbits