Astraight, nonconducting plastic wire 8.00 cm long carries a charge density of 100 nc/m distributed uniformly along its length. it is lying on a horizontal tabletop.
(a) find the magnitude and direction of the electric field that is produced 6.0cm directly above its midpoint.(b) if the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field on a point 6.0cm directly above its center.

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?