1s12s2

1s22s1

1s22s2

1s23s2

The total amount of energy contained in an object

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

What are the dimensions of the cross section that passes through the points a, f, g, and d?