Struggling with Gravitation and Orbits Homework?

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The discussion focuses on solving a gravitation and orbits homework problem, emphasizing the importance of angular momentum and its conservation. Participants clarify that torque is not present in this scenario due to gravitational forces acting at the center of masses, leading to a discussion about calculating velocity using the semi latus rectum and eccentricity. There are debates about the application of Kepler's laws and the correct interpretation of angles in relation to the ellipse. Ultimately, the conversation highlights the need for a solid understanding of geometric properties of ellipses and relevant equations to arrive at the correct solution. The participant successfully resolves the problem after applying the discussed concepts and calculations.
  • #31
Gneill, he was working from the geometric fact that if you draw a line from the two focii to a point on an ellipse, the angle between the tangent at that point and each line is the same, following from the link I'd posted in post #20. One can then easily derive the angle between the position vector and the velocity if one knows the length of the semilatus rectum.
 
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  • #32
Ok thank you for the help! I plugged in the values into the equation, and solved. I got the correct answer.
 

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