Struggling with Gravitation and Orbits Homework?

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    Gravitation Orbits
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Homework Help Overview

The discussion revolves around a problem related to gravitation and orbits, specifically focusing on angular momentum and its conservation in the context of elliptical orbits. Participants are attempting to analyze the dynamics of an object in orbit, considering various physical principles and relationships.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants discuss the role of angular momentum and torque in the problem, questioning whether gravitational forces introduce torque. There are attempts to relate the semi latus rectum, eccentricity, and perihelion distance to the problem. Some participants express confusion over the application of Kepler's laws and the relationship between velocity and distance in elliptical orbits.

Discussion Status

The conversation is ongoing, with various approaches being explored. Some participants have offered guidance on relevant equations and concepts, while others are questioning the assumptions made regarding angles and distances. There is no explicit consensus yet, but the discussion is productive with multiple interpretations being considered.

Contextual Notes

Participants are working under the constraints of a homework problem from the U.S. Physics Olympiad exam, which may influence the level of detail and complexity expected in their responses. There is also a noted lack of certain information, such as the distance from the sun to point P, which complicates the analysis.

  • #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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