The assignment results should be placed in your AFS directory, preferably in a separate subdirectory. You should notify me by e-mail, when you have submitted your assignment. And one doesn't grade one's colleagues. But, of course, one is perfectly at ease rejecting their papers and grant applications. The mass associated with the source is M and the mass of the dust particle is m .
Gravitational energy is always negative.
If the total energy is negative the particle is trapped in the gravitational well. L should stay constant both with regards to its length and with regards to its direction. 4. measure the time it takes for the particle to travel the full circle around the centre of the system. You may have to resort to interpolation in order to measure that time exactly. Let us call that time T .