An experienced baseball player can throw a ball with a speed of 140 km/h. Suppose that an astronaut standing on Mimas, a small moon of Saturn of mass 3.76 × 1019 kg and radius 195 km, throws a ball with this speed. (a) If the astronaut throws the ball horizontally, will it orbit Mimas? (b) If the astronaut throws the ball vertically, how high will it rise?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

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?