1. Batteries power much of our modern mobile lifestyle. AA batteries are often rated in units of milliampere-hours (mAh). This unit is actually a measure of the charge that the battery contains, and may be converted directly to coulombs by the formula 1 mAh = = 3.6 C. How many coulombs of charge are contained in a AA battery rated at 1500 mAH? 2. Thirty-five coulombs of charge flow through a wire in 2 minutes. Determine the current in the wire.
3. If 2 mA of current flow in your mp3 player, how long will it take for 1C of charge to flow?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

What happens when a rubber rod is rubbed with a piece of fur?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".