Afriend shouts to you from the other side of a canyon. if the sound does not reach you until 4 seconds after your friend begins to shout, and the canyon is 1372 meters across, what is the speed of the sound? a) 45 m/s b) 343 m/s c) 423 m/s d) 1372 m/s

The two metal spheres in the figure are connected by a metal wire with w switch in the middle. initially the switch is open. sphere 1, with the larger radius, i'd given a positive charge. sphere 2, with the smaller radius, is neutral. then the switch is closed. afterward, sphere 1 has charge q1, is at potential v1 and the electric field strength at its surface is e1. the values for sphere 2 are q2, v2, and e2. a. is v1 < ,> , or = to v2? explain. b. is q2 < , > , or = explain? c. is e1 < ,> ,or = to e2? explain?