Q. A bullet is fired horizontally with an initial velocity of 900m/s at a target located 150m away from the rifle. How much time is required for the bullet to reach the target. How far does the bullet fall in this time?

Q. The electric field at point P just outside the outer surface of a hollow spherical conductor of inner radius 15 cm and outer radius 31 cm has magnitude 465 N/C and is directed outward. When an unknown point charge Q is introduced into the center of the sphere, the electric field at P is still directed outward but is now 210 N/C. (a) What was the net charge enclosed by the outer surface before Q was introduced? (b) What is charge Q? After Q is introduced, what is the charge on the (c) inner and (d) outer surface of the conductor? Give answers in nC.