Q. A 5.8 g bullet leaves the muzzle of a rifle with a speed of 308 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.9 m long barrel of the rifle?

Q. Two spherical shells have a common center. A -1.00 x10-6 C charge is spread uniformly over the inner shell, which has a radius of 0.050 m. A +5.00 x10-6 C charge is spread uniformly over the outer shell, which has a radius of 0.15 m. Find the magnitude and direction of the electric field at a distance (measured from the common center) of .20m.