Annoying ellitpical orbit problem

  • Thread starter Thread starter superaznnerd
  • Start date Start date
  • Tags Tags
    Orbit
Click For Summary
SUMMARY

The discussion centers on calculating the speed of a planet in an elliptical orbit at its furthest point from a star, given its speed at the closest approach. The planet's speed at closest approach is 100 m/s, with a distance of 1 x 1010 m, and the furthest distance is 3 x 1010 m. The total mechanical energy remains constant throughout the orbit, as dictated by the conservation of energy principle. The solution involves applying the conservation of mechanical energy and utilizing ratios to simplify calculations.

PREREQUISITES
  • Understanding of elliptical orbits in celestial mechanics
  • Familiarity with the conservation of mechanical energy
  • Basic knowledge of gravitational potential energy (mGh)
  • Proficiency in kinetic energy calculations (1/2mv2)
NEXT STEPS
  • Study the principles of Kepler's laws of planetary motion
  • Learn about the conservation of angular momentum in orbital mechanics
  • Explore energy conservation in non-circular orbits
  • Investigate the relationship between orbital speed and distance from the central body
USEFUL FOR

Students studying physics, particularly those focusing on celestial mechanics and orbital dynamics, as well as educators seeking to clarify concepts related to energy conservation in elliptical orbits.

superaznnerd
Messages
59
Reaction score
0

Homework Statement



a planet in elliptical orbit about a star has speed of 100 m/s at its closest approach of 1X 10^10m . what is the speed at its furthest approach of 3X10^10m? What has happened to its total mechanical energy?

Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
You have to at least give it a try before asking for help.
 
I tried to figure out it using mGh+1/2mv^2 = mechanical energy original = mechanical energy final. However, I know there has to be an easier way to do it, using ratios. Could you please tell me the trick?
 

Similar threads

  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
Replies
1
Views
2K
Replies
3
Views
10K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 30 ·
2
Replies
30
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
44
Views
7K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 14 ·
Replies
14
Views
3K