I got it! The total voltage coming from the AC source varies with time, so the voltage across the resistor also varies with time. Once I realized that this voltage of 110V is really the length of a vector in the complex plane, it becomes much easier. Obviously, if the voltage of the resistor is...
Homework Statement
A series RL circuit is connected to a 110-V ac source. If the voltage across the resistor is 85 V, find the voltage across the inductor.
Homework Equations
V = IR
The Attempt at a Solution
How does one go about solving this? My intuition tells me that KVL must be...
I think I have figured it out. If you consider the outward flux from the bottom of the hemisphere (ie. a disk), then that is equal to 9 Pi. The total flux through the curved surface is then (36 - 9) Pi, or 27 Pi
I'm exploring the divergence theorem and Green's theorem, but I seem to be lacking some understanding. I have tried this problem several times, and I am wondering where my mistake is in this method.
The problem:
For one example, I am trying to find the divergence of some vector field from a...
Ahhhhhhh. So the equation should really be -1 * v(x) = 2 * I because of the passive sign convention and the direction of the current.
Then it becomes
v(x) = -(3 + v(x)/4) * 2
v(x) = -6 + -v(x)/2
(3/2) v(x) = -6
v(x) = -12/3 = -4 V
Thanks for pointing that out gneill! I understand now...
Hi! This is simple mesh analysis. I wanted to try to solve the problem with nodal analysis.
1. Homework Statement
Homework Equations
V = IR
We are supposed to use mesh analysis or node analysis.
The Attempt at a Solution
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First step: the two current sources (independent and...
http://i.imgur.com/MRjOT9K.png
here are the steps of the proof in detail. After the last step, I use the relation: http://i.imgur.com/kUHerIR.png to get to what I mentioned above.
Sorry for doing this, but I don't know how to input code on this site. I'll just link to pictures.
Starting with the cosine series, I am able to use this relation: http://i.imgur.com/kUHerIR.png to get this: http://i.imgur.com/PClCbED.png. After simplifying I get the following, which I am...
Thanks to all for the response. I ended up taking the exponential series and dividing it into two parts. One corresponds to e^+iθ and the other corresponds to e^-iθ. I can then easily take these and use the geometric progression formula. At the end of the day, I get REALLY close... I end up...
I'm having trouble completing this proof for homework.
1. Homework Statement
Prove that cos θ + cos 3θ + cos 5θ + ... + cos (2n-1)θ = (sin 2nθ)/(2 sin θ).
Prove that sin θ + sin 3θ + sin 5θ + ... + sin (2n-1)θ = (sin nθ)^2/(sin θ).
Use Euler's formula and the geometric progression formula...
Thanks to both of you, Mr Anchovy and Ray Vickson.
I was able to solve both A and B.
It is now clear to me that 2ixy = 2ixy (ie. z= -z) only when either x or y (or both) = 0. This is obvious now! :smile:
The same is true for B. That was a silly oversight. I ended up with the correct...
I have a few complex equations that I am having trouble solving for homework.
Homework Statement
Solve for all possible values of the real numbers x and y.
A. (x+iy)2 = (x-iy)2
B. (x + iy + 2 + 3i)/(2x + 2iy - 3) = i + 2
C. Abs[1 - (x + iy)] = x + iyHomework Equations
The example problem...
Hi there,
I'm having trouble understanding the Fourier transform of a function where the result in the frequency domain has imaginary components.
For example, if you take the Fourier transform of Sin[t] , the result is I Sqrt[\[Pi]/2] DiracDelta[-1 + \[Omega]] -
I Sqrt[\[Pi]/2]...