An object of mass 20 kg is raised vertically through a distance of 8.0 m above ground level. using g=10 m/s^2 what is the potential energy of this object at this position? a.)160 nn b.)1600 nm c.)160 n/m d.)1600 n/m

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

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?