Can I replace Q with this:
Q=\sigma 4\pi R^{2}
That would mean the electric field from the spherical shell is:
E_{shell}= \frac{\sigma}{\epsilon_{0} }
Although I'm still not sure about the direction part of if anything else I've done so far is correct.
I got the equation for the spherical shell from my textbook, which uses it as an example. It says this about it:
Electric field due to a uniformly charged spherical shell. Outside the shell, the field lines have spherical symmetry: they diverge from the origin. The field line pattern is the...
Homework Statement
Ok, here's the problem. It deals with the superposition of electric fields from uniformly charged shapes: A uniformly charged infinite plane is located at z = 0, with a surface density of charge σ. A uniformly charged spherical shell with the same surface density is located...
Thanks for the help Dr. Transport. But in the end I ended up using this formula:
f_n=\frac{1}{T}\int_0^T v(t) e^{-j n \omega t} dt
where n is some arbitrary number of coefficients. Also, n is the index of f (an array). Then I plotted \overrightarrow{\left|f\right|}_n versus \frac{n}{T}...
It's a math question I suppose. I need to know the steps to find a fourier transformation. I know that MATLAB and other computer programs can solve this type of problem, but I want to understand the math behind it.
The signal is from a voltage supply. I see lots of pages on the internet about this, such as this one, which shows what the magnitude spectrum looks like for a square wave with an arbitrary number of co-efficients. But how would I actually create that graph myself?
I have this fluids problem I've been working on for a while, but I can't seem to get the correct answer. The problem is:
A circular window with radius 25 cm in a submarine can withstand a maximum force of 1.23E6 N. If the interior of the submarine is maintained at a pressure of 1 atm...
I have these two fluids problems and I can't get either one (they are related). Can anyone point me in the right direction?
1. A 3.05 kg piece of wood (SG = 0.500)) floats on water. What minimum mass of copper, hung from it by a string, will cause it to sink?
2. A 3.25 kg piece of wood (SG...
I know I'm probably a few months late and I doubt you need the answer anymore, but I'll post this in case someone else comes across a similar problem.
You were going in the wrong direction with your solution. This is not a conservation of momentum problem; it is a center a mass problem...
Correction
Thanks, Doc. The correct answer is indeed 214 N. I meant that the method Halls used to solve it was correct, although I went through the calculations and plugged in the numbers myself.
It is easier to use Newton's 2nd Law. I had tried this the first time, but arrived at the wrong...
That works
Thanks for the reply. I think I follow your reasoning, although you did it differently than I did (I was trying to analyze the system only in terms of Newton's second law). The answer is correct, though. :smile:
I'm working on this rather simple pulley problem, and can't quite figure it out. It doesn't even involve acceleration. Could anyone help me out? Thanks.
Here's the problem:
A crate is pulled up using frictionless pulleys in the manner shown in the figure. The angle is 45 degrees. The masses...