# Gravitation course work

1. Homework Statement

A planet around a star has an orbit that is not exactly an ellipse. In addition to the dominant Fo $$\alpha$$ r^-2 term due to gravity from the central star, the planet seems to be responding to a slight additional force which has the form F1 $$\alpha$$ r^-$$\alpha$$ where $$\alpha$$ is some constant.

2. Homework Equations

Included in 1.

3. The Attempt at a Solution

Where do I begin?

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Kurdt
Staff Emeritus
Gold Member
I have no idea since I don't know what you're supposed to be doing.

Sorry, part of this seems to have been cut off.

Assuming there is a slight background density of material with spherically symmetric density p1 falling off as p1 (alpha) r^-B

Find the value of B in terms of alpha

Can anyone help me get started please? I don't understand this at all and it's due soon.

Dick