# Search results

1. ### Derivative Question

Oh, I see it now. Thanks.
2. ### Derivative Question

Also, where would apply the chain rule here? I don't see it.
3. ### Derivative Question

ok, could you elaborate on that a little. I know what the chain rule is but I don't see it's application here. The result ought to be the same regardless of when I plug in the value of the radius (in this case c/2pi). I don't see why the value of the radius would ever change. That seems like it...
4. ### Derivative Question

Homework Statement Find the derivative of volume of a sphere. Homework Equations Volume=4/3 * pi * r^3 OR Volume = 4/3 * pi * (c/2pi)^3 where c=circumference The Attempt at a Solution This is where I have had some serious trouble. Allow me to explain. Obviously the...
5. ### Very strange question for derivative

Wow, good catch. I didn't realize the contradiction. The way I stated the problem is all the info given to me by the question. The problem asks to find the slope of the tangent at the point where x=a. A is an x value, not a point. The problem does not tell me what a is. I will edit the...
6. ### Very strange question for derivative

Homework Statement The question in it's complete wording: Consider the following curve. y = 8 + 5x2 - 2x3. Find the slope of the tangent to the curve at the point where x = a. Homework Equations (y2-y1)/(x2-x1) where x2=x1+dx and the limit of dx is approaching zero and y2=f(x+dx). The...
7. ### Question about two charges on a line.

thanks for your help. i asked my teacher to work it with me today and he clarified.
8. ### Question about two charges on a line.

ehild, I am sorry to be so stubborn, but I still don't see how to come any closer to the answer. Let's say I put a test charge of 1.00 Coulomb at the position (3.00m, 0.00m). Now the equation I will use will be: E = KQ1/r2 + KQ2/r2 Going by this and using the numbers I have chosen for my...
9. ### Question about two charges on a line.

how would i set that equal to zero?
10. ### Question about two charges on a line.

i think you are talking about E=kQ/r^2
11. ### Question about two charges on a line.

That makes sense to me but I am not sure where to go from there. Can you suggest a formula to do that? I am still not sure what to do with the problem.
12. ### Question about two charges on a line.

Homework Statement A charge of 5.00mC is at the point (1.00m, 0.00m) and a charge of -4.00 is at the point (-1.00m, 0.00m). At what point, or points, on the x-axis is E=0? Homework Equations I decided to use the equation for voltage and set it up like this: E = 0 = (k)(Q1) / x +...