Suppose that, as a function of x, y, and z, an electric field has the following components: Ex = 6x2y, Ey = 2x3 + 2y and Ez = 0 where E is measured in V/m and the distances are measured in m. Find the electrical potential difference between the origin and the point x = -0.1 m, y = 3.9 m, z = 0.0 m.

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?