A charge of 18 nC is uniformly distributed along a straight rod of length 3.1 m that is bent into a circular arc with a radius of 1.9 m. What is the magnitude of the electric field at the center of curvature of the arc?

Two horses begin at rest. after a few seconds, horse a is traveling with a velocity of 10 m/s west, while horse b is traveling with a velocity of 13 m/s west. which horse had a greater acceleration? a. horse a because its change in velocity was greater than horse b's in the same time. b. horse b because its change in velocity was greater than horse a's in the same time. c. horse b because its change in velocity was the same as horse a's, but it took less time. d. both horses had the same acceleration.