An 82 kg man on a diving board drops from rest 3.0 m above the surface of the water and he comes to rest 0.55 s after reaching the water. What is the average net force on the diver as he is brought to rest? Remember to first find the velocity of the man after he falls 3.0 m off of the diving board.

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

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?