Two metal spheres, each of mass 18 g and initially at rest, are dropped from a height of 9 m in an evacuated chamber. one sphere has a charge of +70 μc, and the other has a charge –70 μc. find the difference in final speeds of the two spheres (the speeds just before each one hits the ground). assume that there is a downward electric field of about 150 v/m near the earth’s surface.

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s