Homework Statement
Find \frac{V_o}{V_i}
for
http://img685.imageshack.us/img685/8658/nodevoltage.png
Homework Equations
s=σ+jω, where σ=real component & jω=imaginary component
The Attempt at a Solution
Solution is
\frac{V_o}{V_i}=\frac{1}{s+2}
Solution manual says...
Homework Statement
p[n]=x[n]w[n], where w[n] is the rectangular window.
x[n]=\sum_{k=-∞}^{∞} δ[n-k]
w[n]= 1, for -M≤n≤M;
= 0 otherwise
1. What is X(e^{jw})?
2. What is P(e^{jw}) when...
M=1?
M=10?
j is the imaginary number. (it's the same as i.)
Homework Equations...
It says to derive the Electric Gauss Law (1) from Generalized Ampere's Law (2).
What is the appropriate way to apply Stokes' theorem? I'm confused.
Thanks for both of your help, by the way. I greatly appreciate it.
Even if I use the divergence theorem and Stokes' Theorem, I get stuck:
\nabla \times H = J + \frac{\partial D}{\partial t}
\int\int_s (\nabla \times H) \cdot ds = \int\int_s J \cdot ds + \int\int_s \frac{\partial D}{\partial t} \cdot ds
\oint_c H \cdot dl = \int\int_s J \cdot ds +...
Well, the problem asks for us to derive the equations as they are, but if integrals are necessary, I can try that. I just didn't know if I had to use integrals or not.
How would I go about starting that?
\nabla \times H = J + \frac{\partial D}{\partial t}
\int H \cdot dl = I_f,s +...
yes, but what dose that have to do with finding the equivalent impedance?
to find the equivalent impedance, you must combine the resistors in the phasor domain. I'm having difficulty doing that.
Homework Statement
Find the input impedance Z. (i.e. Find Z equivalent.)
Answer in the back of the book: Z=84.907-j20.12 ohms
[PLAIN]http://img834.imageshack.us/img834/8508/circuit.png
Homework Equations
n/a
** j=sqrt(-1)
The Attempt at a Solution
I combined the 60-ohm, 50-ohm, and...
Homework Statement
I just want to know why the tension in the rope in system A is not equal to 100 lbs, while the tension in the rope in system B IS 100 lbs.
[PLAIN]http://img823.imageshack.us/img823/9462/conceptualquestion.png
In system A, a 100-lb mass is hanging. In system B, there...
Homework Statement
Find the Thevenin equivalent seen by RL in the figure below:
[PLAIN]http://img708.imageshack.us/img708/7023/thevenineqi.png Homework Equations
RL = Load resistor
The double-headed arrows indicate that RL is the loadThe Attempt at a Solution
I know how to find the Thevenin...
Homework Statement
Draw the free-body diagram of the structure by isolating it from its supports at A and E. Determine the reactions at A and E.
[PLAIN]http://img715.imageshack.us/img715/7161/physics.png
Homework Equations
M = (Fy)*x, or M = (Fx)*y
where "x" represents horizontal distance...
Homework Statement
[PLAIN]http://img24.imageshack.us/img24/4168/circuitv.png
Find vx and ix.
Homework Equations
Kirchhoff's Current Law: The algebraic sum of the currents entering a node is zero at any instant:
Σi = i1 + i2 +... iN = 0
The Attempt at a Solution
Since it's...
Homework Statement
A 1000 kg steel beam is supported by two ropes. What is the tension in each?
Homework Equations
F = ma = mg
The Attempt at a Solution
I labeled the left tension as T_{1} and the right tension as T_{2}.
\sum{F_{y}} = T_{1,y} + T_{2,y} -mg = 0...