Homework Statement
suppose a coil is placed in a changing magnetic field and the circuit is not closed will the current induce in the coil
Homework EquationsThe Attempt at a Solution
What I thought was that the current flows only in a closed circuit because it needs a potential difference...
When we try to find magnetic field due to a set of current carrying wires in a region we draw an imaginary amperian loop and using ampere's law find the magnitude of the magnetic field.
##\oint \vec B \cdot d\vec l = \mu_{0}i_{enclosed}##
The RHS involves only the enclosed current inside the...
Homework Statement
It is just a conceptual doubt
Homework Equations
According to malus law intensity of light through polaroid is
I=(Io)cos^2(theta) where theta is the angle between axis of polaroid and incident light.
The Attempt at a Solution
But when Theta=0 then I=Io but in my book it is...
Hi, I was studying for my final exam on statistical physics and a doubt raised on my head that was truly strong and disturbing (at least, for me), and that I couldn't answer to myself by now.
The doubt is: Given that we have in d dimensions a fermion non interacting gas, the statistical...
So the statement which the proof's about is: For every linear transformation ##A##(between finite dimension spaces), the product ##A^*A## is self-adjoint. So, the proof is:
##(A^*A)^*=A^*A^{**}=A^*A##
What i don't understand is why ##(A^*A)^*=A^*A^{**}##. Isn't that true only if ##A## and...
Homework Statement
A uniform thin rod of length ##2l## and mass ##m## lies on a horizontal table. A horizontal impulse ##J## is given to the rod at one end. There is no friction. The total kinetic energy of the rod after impulse will be ?
Homework Equations
##Jl=I\omega##
##J=mv_{cm}##...
Considering the figure, (a) what is the tension along the wire 1?
(b) What is the tension along wire 1 immediately after the wire 2 is cut?
Now, if I put myself in a reference frame with y-axis along ##\vec{g}## (with inverse direction) the part (a) is $$\begin{cases} T_1\cdot cos\theta -mg=0...
It is a well known fact that, in electromagnetic units, strength of a shell and strength of current flowing through its boundary are same. See here.
\begin{equation}
\begin{matrix}
\text{i.e.}\: i \text{(biot)} = \phi \text{(biot) }
\end{matrix}
\tag{1}
\end{equation}
(a) While converting to...
Hi.
First, let me introduce myself:
I m from Brazil, I studied physics a few years ago and I ended up leaving the course, today I work with software development.
I would like to know if you can help me to take a doubt:
I came up with an idea that an electron could move so fast that it would...
Hi all ,
I have a very simple doubt in the basics of radioactivity .
Nuclear fission is the splitting of the nucleus of a heavy atom such as U23592 by bombarding with slow neutrons into two lighter nuclei with a simultaneous release of huge amount of energy .
Now my doubt is that -
Can a...
Homework Statement
A ball is dropped from rest at height ##h##. We can assume that the drag force from the air is in the form ##F_d=-m \alpha v##.
I know then the position in function of the height $$y(t)=h-\frac{g}{\alpha} (t-\frac{1}{\alpha} (1 - e^{-\alpha t}))$$
If I take ##\alpha t<<1##...
Consider the Kirkoff integral theorem and the Huygens -Fresnel principle/formula (both from Wikipedia):
KIT
The Kirchoff integral for monochromatic wave is:
$$U({\mathbf {r}})={\frac {1}{4\pi }}\int _{S'}\left[U{\frac {\partial }{\partial {\hat {{\mathbf {n}}}}}}\left({\frac...
A pendulum of mass m and length l is suspended from the ceiling of a trolley which has a constant acceleration a. Find the maximum deflection θ of the pendulum from the vertical.
When I used work energy theorem, I got θ = 2 arctan(a/g). But when I took the equilibrium position and equated the...
Hi. I was checking the library for the discrete Fourier transform, fftw. So, I was using a functition ##f(x)=sin(kx)##, which when transformed must give a delta function in k. When I transform, and then transform back, I effectively recover the function, so I think I am doing something right...
< Mentor Note -- New user has been reminded to use the Homework Help Template when posting schoolwork questions >
What is the ratio of the uncomplexed Zn+2 ion in a solution that is 10M in NH3, if the stability constant of [Zn(Nh3)4]+2 is 3x10^9.
I am not able to understand why they have given...
Question: A) Derive the work - energy theorem for one particle.
B) Check whether it is applicable for a system of particles and a rigid bodyWork - energy theorem for one particle system,
total sum of work done by individual forces = work done by total force
To show the above equality,
let's...
Homework Statement
Homework EquationsThe Attempt at a Solution
[/B]
Since there is no net torque or net force acting on the system( which consists of the system given in the picture), I applied conservation of angular momentum and energy.
I took on the L.H.S. the angular momentum or energy...
So, i just started an elementar study on hidrodynamics and I'm stuck with something.
We have that the circulation in a closed path Γ is given by:
##C_Γ=\oint_Γ \vec v⋅\vec {dl}##
And that, in a irrotational flow, ##C_Γ = 0## for any given Γ.
But if we have an irrotational vortex wouldn't...
Can a sphere with a frozen - in uniform polarization ## \vec P ## be considered a linear dielectrics?
Following the definition of dielectrics given in Griffiths:
The electric field inside the sphere,
## \vec E = \frac {-P}{3 \epsilon_0} ##
So, ## \vec P ≠ ε_0 χ_e \vec E ## as ## ε_0 χ_e##...
In Carnot cycle during the process - "Reversible isothermal heat addition"
Q (supplied) = ∫pdV
This means that the supplied heat is utilized for pdV work.
My doubt is if the Q supplied is converted to work in this process then how Carnot cycle can reject heat during the upcoming isothermal...
Hello.
Let's image a bar. In one side is attached to a body so the bar can rotate over this axis. There is no friction between the two bodies. The system is at rest in t=0. A force acts forming a 90° angle with the bar. The bar moves and begin to rotates. The force dissapear.
There is no force...
This is more of a recurring conceptual doubt that I keep on running into when solving thermodynamics problems. We are taught that variations between extensive state variables in equilibrium are given by the following 'fundamental formula':
dE = TdS + \mathbf{J}\cdot{d}\mathbf{x} +...
The text in the paper says that C1 has Vout/N-1 = Vout/6, C2 has 2*Vout/6 and so on...
Can someone please explain how?
Source : Liao, Zitao, Yutian Lei, and Robert CN Pilawa-Podgurski. "A GaN-based flying-capacitor multilevel boost converter for high step-up conversion." Energy Conversion...
Hello all, i am having a hard time with EM, specially with the most simple concepts that i don't seem to grasp at all and the simple exercises that should be quite simple to solve.
So the question is. ( i will omit the constant (1/4pieo) for practice sake
When i calculate the eletric field...
Homework Statement
Find the order of the differential equation of y=C1sin2x+C2cos2x+C3.
Homework Equations
-
The Attempt at a Solution
[/B]
I read in my book that the order of the differential equation is equal to the number of arbitrary constants but the answer given is 2.
Btw I have...
so a pilot is spining in a circle at a constant speed, the g forces he will feel will be the same than normal acceleration dependant on wr
but now you put him inside a tube where he can move along varying the radius of the circle
now the normal acceleration will be zero because he is in the...
Homework Statement
Given : (y+2)(y-3) <= 0Homework EquationsThe Attempt at a Solution
Now, I have y-3 <= 0 or y+2 <= 0
Hence, y <= 3 or y <= -2
But how
is correct?
I think
is wrong because y <= -2.
Can someone please clarify?
It is mentioned in my Textbook that if alpha-particle has large impact parameter, it gets scattered through small angles and vice versa.
I understand that impact parameter is defined as the perpendicular distance between the path of a projectile and the center of the nucleus.
I am unsure how...
I have read Average translation kinetic energy is 1/2RT per degree of freedom and Average translation kinetic energy for an ideal gases is 3/2RT.How? Does it imply f=3 for all ideal gases?
Is it true that some mechanical systems( or machines or mechanisms) of problems and exercises of Mechanical Engineering books(engineering dynamics, mechanics of materials, fluid dynamics...) are invented ? That is, they don't exist in real life, they are created only for a particular problem or...
Homework Statement
As shown in figure.
Homework Equations
dq=msdt[/B]The Attempt at a Solution
I am unable to understand the question,what is the significance of the moving piston if the ends of the conducting rod is maintained at constant temperature.It is enough if someone could explain...
Let's say that we have this expression,
$\frac{1}{2}*2x*x-2$
So now solving this in one method we can
$\frac{1}{\cancel 2}*\cancel2x*x-2=x^2-2$
In another way
$\frac{1}{2}*2x*x-2=\frac{2x^2-2}{2}=x^2-1$
What is the reason that I get two different answers ? I hope that both ways are valid...
I know that to calculate the torque about an axis, we can choose any point on that axis and find the torque about that point and take the component along the direction of the axis.Buy what is the proof behind this theorem?
Homework Statement
Hi, this is a question that has been bothering me for a while. (Im in calculus II at the moment)
Why do i need to derivate some functions by definition and other times i dont? for example if somebody asks me to calculate the partial derivatives of a branch function in a a...
Problem
Plot the above given information in a Distance time graph.
Where do I need help
Hoping my graph is correct
Show that the speed in the final 6 seconds is twice the speed in first 6 seconds
But I'm having trouble here , I know $ distance=\frac{distance}{time} $
Many Thanks :)
Hey (Wave) (Party),
Problem
Factor $3x^2+11x+10$
Workings
This expression can be separated into,
$3x^2+10x+x+10$
Where have i done wrong ? (Thinking)
Many Thanks :)
According to Kirchoff
$$e=J(T,f)A$$
##e## is the power emitted and ##A## is the power absorbed
If ##E## is the power supplied, can I say that
$$e=E-A$$
Good afternoon,
I'm glad I've joined this forum. Here's my doubt: I have a serie of values in a table like this:
Case 1 34 55
Case 2 23 10
Case 3 55 40
etc...
the 34 means the observed value, and the 55 the control group, and so on. It's easy to do the test of course if...
The problem is: if...
I have started quantum mechanics on my own using online lectures. So i have very basic doubts:
1) probability of electron is defined in space rather than a point. My question is why don't we comment about probability at a point.
I thought two possible explanation that:
1.1)ψ2dx the dx term...
I've a doubt regarding photoelectric effect. It's said that photoelectric effect is proof for light to be a particle. But, when seen into the theory, relations between wavelength and kinetic energy, frequency and photoelectric current are explained. The means we have used wave characters like...
I wonder if it is correct to read an open air manometer in the case of viscous fluid in the following (usual) way. Consider the situation showed in the picture where a viscous fluid is flowing, in fact ##z_C <z_A##.
The reading of the manometer would be ##p_a=\rho g z_a##, ##p_b=\rho g z_b##...
I am currently reading Prof.Leonard Susskind's Lecture on Quantum Mechanics. In the Chapter: Spin in the arbitrary directions, in the subdivision Eigenstates
In case $$\lambda=1$$
Prof states that measuring spin in arbitrary +n state gives me +1 as eigenvalue, what I don't understand is the next...
Good evening. I've got stuck in this question from my book of Mechanics of Materials by Beer and Johnston about torsion.
The allowable shearing stress is 15 ksi in the 1.5-in.-diameter steel rod AB and 8 ksi in the 1.8-in.-diameter brass rod BC. Neglecting the effect of stress concentrations...
I want to ask that how to understand the relation of different concentration terms.
Like the relation of Molality, Molarity & Density & related relations of concentration terms.
So how to understand the relations easily?
qrev/T = ΔS
here what does ΔS signify?does it mean change in entropy of system or surroundings?
how is entropy of system,surrounding and universe related to each other and which entropy is used in gibbs free energy equation?
Hi all! I'm Ray and I'm new to this community, it's a pleasure!
I'm trying to resolve a trigonometry exercise where I have to calculate the trigonometry Identities of a right triangle but in the specifications they don't show me any common data (hypotenuse or cathethus values), they just leave...
I have attached two images from my textbook one of which is a diagram and the other a paragraph with which I am having problems. The last sentence mentions that due to violation of 2nd law we cannot convert all the heat to work in this thermodynamic cycle. However what is preventing the carnot...