Why is it warmer near the equator and cooler near the poles?

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?

An object in mechanical equilibrium is an object

Which one of the following represents the reduced forms of the two major electron carriers? nadh and fadh2 nad+ and fadh2 nad+ and fad nadh and fad