A rocket is 1.00x10^10m from a moving star moving at a speed of 1.00x10^5 m/s with a total energy of -1.67x10^17 J when it experiences a gravitational force magnitude of 6.67x10^7 N. It turns on its thrusters and its speed as well its distance to the star doubles by the time the thrusters are turned off.(adsbygoogle = window.adsbygoogle || []).push({});

Find the rocket's mass, the star's mass

Prove the fist trajectory is elliptical and not circular.

If a=1.11x10^10 m for the first trajectory, find the period.

Find the work done by the thrusters in changing trajectories.

How would I star this problem? It is the first part of physics ( Mech)

I know r'= 2r and v'=2v

would I use the orbtial formulas to find the mass or something else. Any hints or anything will be helpful thank you.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Rocket and orbital problem

**Physics Forums | Science Articles, Homework Help, Discussion**