Air in a cylinder is compressed to one-tenth of its original volume without change in temperature. what happens to its pressure? imagine now that a valve is opened in order to restore the initial pressure value. what percentage of the molecules have escaped?

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

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?