I'm confused about the terminals in the picture above simply because I've seen the exact same thing mean 2 different things in schematics, namely:
(1) it is an open circuit with voltage Vi(t)
(2) The terminals are connected to some other circuit and thus have a voltage/current source, and the...
In my circuit analysis class I consistently need to solve system of complex equations, and I can't use MATLAB or anything for it. Suppose I have the following system:
(Va-Vs)/(-j15) + Va/33 + (Va-Vo)/(-j25)=0
(Vo-Va)/(-j25) + (Vo-Vs)/10 = 0
What is the best way to solve it by hand in a time...
[Prefix]
When we do trigonometric substitutions (such as for the integral x^3/(a^2-x^2)^2), we say something like "let x = asinp for -pi/2 <= p <= pi/2" then we carry on and solve the integral.
However, sometimes our answer is ugly and we get some term in our expression like "cosp"- so we draw...
It is my general understanding that according to KCL, current requires a closed loop to flow in DC. However, this is apparently not true in AC; current doesn't needa closed loop to flow.
I have drawn a circuit below which causes confusion:
C1 is a charge capacitor, R1 is a resistor, I1 an...
I've been dealing with the concept of moment this whole year, in statics/dynamics but I've never really completely understood it, just rather memorized it.
What I think moment is:
If some point on a body has moment, then this means it wants to rotate. So moment is essentially what causes...
When answering a related question on physics forum, I found something I seemed to be confused about:
Suppose we have a battery connected in series to a capacitor with no charge. A capacitor with no charge on it acts like an open circuit.
I know what happens next: the battery charges the...
If a wheel is rolling down a hill without slipping then we know the contact point has zero velocity.
Is it also true that the tangential acceleration of this point is zero too?
Homework Statement
Calculate the current in the capacitor shown in the figure below if the voltage input is V(t) = 29cos(377t-30) V, C = 1 micro Farad
Homework Equations
i = C dv/dt
The Attempt at a Solution
I essentially differntiate V(t) and multiply by 1 * 10^-6. I then get a negative...
Homework Statement
Homework Equations
V=IZ
The Attempt at a Solution
So my plan is as follows:
Find the current through the 1 ohm resistor, multiplying this by the combined impedance of the capacitor & 1 ohm resistor. Now I know the voltage across the unkown impedance Z. Subtract this...
Homework Statement
Homework Equations
V=IR
The Attempt at a Solution
I try to simplify the circuit by combining the capacitor and 2ohm resistor in parallel, Z = 1-j. Then I add the inductor to get Z = 1. Knowing the current across the resistor, 2(0d) I find the voltage across the 5 ohm...
Homework Statement
(Note, my answer below is also wrong. I've attempted this problem for about 1 hour now and I can't figure it out.)
Homework Equations
KCL (Kirchoffs Current Law)
Z for the capacitor, Z = 1/(jwC)[/B]
The Attempt at a Solution
I'm using KCL at V1 with the following...
Homework Statement
I'm going crazy. I've done this problem nearly 20 times and keep getting the same answer. I've read my textbook so many times too! What am I doing wrong?
Homework Equations
Zcapacitor = 1/(jwC)
Zinductor = jwL
Zresistor = R
The Attempt at a Solution
Z for the...
Homework Statement
We are given K1 = 0. So the answer should be in the form of V(x) = K2e^(-t/z)
Homework Equations
V=IR
V(x) = K1 + K2e^(-t/z)
V(infinity) = K1
V(0+) = K1 + K2
z = RC
The Attempt at a Solution
I draw the circuit for t = 0- and find the voltage across the capacitor...
Here is a picture of a circuit:
I have two questions:
(1) Are all resistors connected in one of two ways? I.e., resistors can be connected in parallel and in series, but is it possible for them to be connected as NOT parllel and NOT series? For instance, the two circled resistors don't...
For instance, I was introduced to thevenin and norton theorems about 1-2 weeks ago and it seems like we're expected to rote memorize the algorithms on solving problems. There is no proof/logic explained in different circumstances.
For instance, we're told what these theorems are and how they...
Homework Statement
Homework Equations
V=IR[/B]
From my textbook:
If the circuit contains both independent and dependent sources, the open‐circuit terminals are shorted and the short‐circuit current between these terminals is determined. The ratio of the open‐circuit voltage to the...
Homework Statement
Homework Equations
V=IR
Kirchoffs Current Law
The Attempt at a Solution
I picked the middle node (the one surrounded by 3 resistors) as my reference. V1 and V2 are my other two nodes.
I'm also assuming that V1>V2, V1<reference
Using Kirchoffs Current Law:
(Node 1)...
In thermodynamics,
(delta internal energy) = (delta) U = q + w
But it is also known that (delta U) = q_v = integral of (C_v) dT
So if C_v is constant, then we have (delta U) = q_v = C_v (delta T)
But the confusing part for me is what follows. For instance, in an adiabatic process, for...
I have big plans for summer (note: I still plan on exercising, eating healthy, and showering regularly. Of course, my goal is 12-16 hours per day, 5-6 days a week), 10 math books to finish in 4 months of moderate to very hard difficulty (for me, not in general. I plan on learning all the...
Suppose we have a block on an inclined plane.
If we choose the x-y axis to be parallel and perpendicular to the inclined plane, then we have
Fy = N - mgcos30 = 0
But if we choose our trivial x-y coordinate system, where y is parallel to the force of gravity, then we get:
Fy = Ncos30 - mg =...
Homework Statement
Homework Equations
F=ma
Ff = N u
The Attempt at a Solution
Pretty much, I did the same thing in the solution.
For box A:
N = mg
Ffs = mg*uk = 9.81*20*.4=78.48N
I note that Ffs > 60 N, so the boxes will move with the same acceleration
Now there are two ways I can...
We all know that momentum is conserved in a system. But I am confused of one thing.
Suppose we have a system containing a wall with very large mass and a ball and use a classical x-y coordinate axis.
If I swing the ball at an angle of 45 degrees from the horizontal, upwards to the huge wall...
Homework Statement
The 75kg boy leaps off the cart A with a horizontal velocity of v' = 3 m/s to the left measured relative to the cart. Determine the velocity of cart A just after the jump. If he then lands on cart B with the same velocity that he left cart A, determine the velocity of cart...
Suppose we have two boxes, A and B with different masses, the spring is fixed to block A.
Then we take block B and press it against block A so that the spring compresses.
Afterwards, we let go of both boxes.
If we were to model this using the conservation of energy, then it is known that...
Here is our momentum equation for when two separate masses m1 and m2 collide with each other and couple together
m1v1 + m2v2 = (m1+m2)v3
In the LHS of our equation, we have two systems. m1 and m2.
But in the RHS of our equation, we use a totally different system. m3, the combination of m1...
I notice a lot of people say that physics is all understanding. But to me it seems like useless memorization of formulas (as opposed to say real analysis). I will give an example over here, with my thought process. Perhaps someone who disagrees with me can tell me their thought process, and...
Hi guys, first year computer engineering student here. I am looking for advice to ace physics/chemistry classes that I have to take. Last semester, I did poorly in statics (class average, got a B-) despite spending the majority of my time doing practice problems/studying for this class. (didnt...
People say that the voltage across one resistor is equal to the voltage supplied.
I've drawn a picture of a simple circuit with two points near the positive terminal. Apparently, if we take the potential difference of these two points, it will equal 9V according to the above saying (which can...
Throughout my limited physics career (high school, first year university) I was introduced to concepts such as potential energy, kinetic energy, and work. Naturally, I was taught about potential energy using the whole gravity analogy. A brick at height h has more potential energy than a brick...