2. suppose a dipole ⃗p is placed in a nonuniform electric field e⃗ = eˆi that points along the x axis. if e⃗ depends only on x and the electric field varies very slowly from the negative to the positive charge in the dipole (2l is the distance between charges in the dipole), show that the net force on the dipole is f⃗ = (⃗p · de⃗ dx )ˆi.

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.