8. A force = (cx - 3x2)î acts on a particle as the particle moves along an x axis, with in newtons, in meters, and c a constant. At x = 0, the particle's kinetic energy is 20.0 J; at x = 3.00 m, it is11.0 J. Find c.

15. The magnitude of the electric field between the two circular parallel plates in the figure is E = (4.0 × 105) - (6.0 x 104t), with E in volts per meter and t in seconds. At t = 0, is upward. The plate area is 6.0 x 10-2 m². For t≥ 0, what is the magnitude of the displacement current between the plates?

8. A force = (cx - 3x²)î acts on a particle as the particle moves along an x axis, with in newtons, in meters, and c a constant. At x = 0, the particle's kinetic energy is 20.0 J; at x = 3.00 m, it is11.0 J. Find c.

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