Aperson travels by car from one city to another with different constant speeds between pairs of cities. she drives for 50.0 min at 70.0 km/h, 16.0 min at 90.0 km/h, and 55.0 min at 40.0 km/h and spends 40.0 min eating lunch and buying gas. (a) determine the average speed for the trip. km/h (b) determine the distance between the initial and final cities along the route. km

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