Suppose that a spherically symmetric negative charge of diameter Req were centered between two protons at the H 2 equilibrium configuration so that the two protons just touch the surface of the sphere. What charge on the sphere is required to give the system a binding energy of 2.7 eV?

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.