Astudent pulls a lever down 4 m. the lever lifts a box that weighs 20 n up a distance of 2 m. how much work was done on the box?

Atomic nuclei of almost all elements consist of

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

Which substance partical has negligible massand travels around outsidethe nucleus