Bill and John go for a run. Bill has a mass of 50 kg and is able to run at a constant speed of 9 m/s when he goes for a jog. John is a bit bigger and has a mass of 65kg and can only keep a constant speed of 7 m/s Who has more momentum ? Explain .

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