Pls help me I want to get this done

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?

Why do some scientists and archeologists think that volta was not the first person to build a battery

A36,287 kg truck has a momentum of 907,175 kg • . what is the truck’s velocity