Node voltage analysis

  • Thread starter bon
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  • #1
bon
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Homework Statement



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?

Homework Equations





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?
 

Answers and Replies

  • #2
ehild
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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
bon
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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

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
ehild
Homework Helper
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Read the text more carefully.

"The star suddenly undergoes an explosion in which one percent of its mass is blown spherically symmetrically to a large distance."

ehild
 

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