Okay I understand somewhat of this topic of grav potential energy but i got stumped on this one question. I am to find the mass of a satellite orbiting earth with the given variables of (F)(units: kN) which is the force the sattelite attracts the earth, and given the gravitational potential energy (-U). You are also givin the gravitational constant (G), and the earth (m_e) How could you find the mass (m) of the sattelite without a given radius in the equation U=-(G*m_e*m)/r ? How would i rewrite this equation i know if i was givin radius then i could write it as m=(U*r)/-(G*m_e) any help would be great thanks lemmy here is the problem "When in orbit, a communication satellite attracts the earth with a force of F and the earth-satellite gravitational potential energy (relative to zero at infinite separation) is - U" "Find the mass of the satellite." "Take the gravitational constant to be G , the mass of the Earth to be m_e ."