Two equal masses M hang from a rope on opposite sides of a pulley attached to the ceiling. The left-hand mass is moving up at constant velocity v and the right-hand mass is moving down at the same speed. What is the tension in the rope? The rope is massless and the pulley is massless and frictionless.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c