A spherical, non-conducting shell of inner radius r1 = 10 cm and outer radius r2 = 15 cm carries a total charge Q = 15 μC distri
buted uniformly throughout the volume of the shell. What is the magnitude of the electric field at a distance r = 12 cm from the center of the shell? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)
d = (20.0 mph)(0.500 hr) + (40.0 mph)(1.00 hr) + (30.0 mph)(0.500 hr) + (50.0 mph)(2.00 hr) d = 10.0 miles + 40.0 miles + 15.0 miles + 100. miles d = 165 miles