Using a lever, a person applies 60 Newtons of force and moves the lever 1 meter. This moves a 200 newton rock at the other end by-2 meters. What is the efficiency?
lems A3

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

Most of the volume of an atom is occupied by the

The energy released by a nuclear fusion reaction is produced when