Recent content by aba3

Then your assumption would imply that nothing ever moves. Newton's law says every force has an equal and opposite reaction. So do all forces cancel out? http://www.batesville.k12.in.us/physics/PhyNet/Mechanics/Newton3/Why_Don%27t_Cancel.html Explains it

You were right. Thanks.

there are a million cubic centimeters in a meter cube. if each cubic cm has 1.1 more electron then the meter cube has 1.1E6 extra electrions (Also, I already tried that and webassign said I was wrong).

Because the cars become entangled, some energy is wasted as heat, thus you cannot use that equation. A collision like this is called inelastic collision. Use the momentum equation for this. http://en.wikipedia.org/wiki/Momentum has a short section on inelastic collisions

Where did the x come from? s(t) = 7t^2 + 33 so by using the power rule s'(t) = 7*2(t(2-1)) = 14t

Work done is not 0, its simply negative. You are right that W = Fd. But friction does apply a force, and the object does move, just in the opposite direction. So the work is F*(-d)

Problem: Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. Wire B has 5 times the cross-sectional area, 1.1 times as many mobile electrons per cubic centimeter, and 2 times the mobility of wire A. In the steady state...