Find the time th it takes the projectile to reach its maximum height h. express th in terms of v0, ? , and g (the magnitude of the acceleration due to gravity).

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

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?