A rock was thrown horizontally from a 500.0 m high cliff. It strikes the ground 100.0 m from the base of the cliff. At what speed was it thrown? use guess method

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

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