Electric field, E = \frac{kq}{r^2}
Since you have two particles with charges, lets call the unknown charge q1, and the known charge q2, where
Since E = 0, \frac{kq_1}{r^2} + \frac{kq_2}{r^2} = 0, where r is the distance from the charge to the point of zero electric field. Therefore...
For...
Be more specific, what do you mean by cartesian co-ordinates? Explain the situation clearly, and exactly what your assignment is, its hard to help when only a couple of questions are known from an entire assignment.
Is this the situation that the two questions apply to?
Im sure someone else can do a better job, but i'll try to answer some of your questions. First of all, if i remember correctly, one period of a pendulum is the time it takes for a complete swing to happen (by complete swing, i mean the weight swings from one side to the other, and back). The...
First list out what u know, it always helps me when I do.
m=2kg
d=1.2m
W=3J
V_0=1m/s
Now figure out how fast the cart accelerates
F=ma, W=Fd=mad
3J=(2kg)(a)(1.2m)
a=1.25m/s^2
Now use a constant acceleration equation to find the speed at the end.
V^2 = V_0^2 + 2ad
V^2 = (1m/s)^2...