Is the earth in a non-inertial reference frame?
So I would agree that it has a uniform tangential velocity but would the centripetal acceleration of the earth put it in a non inertial frame.
View ArticlePotential Energy/Work done paradox?
We all know that whenever an object is subjected to move against a conservative force field by an external agent,work should be done to do that.Let that work be W(applied). This is stored as Potential...
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Energy and restrictions
I'm trying to simulate a long chain of atoms where I restrict the bond (length between two consecutive atoms) and angle (between three consecutive atoms). Therefore, if I want to simulate N particles,...
View ArticleDoubt M.G.Calkin exercise
I have a doubt with the first exercise from the book M.G.Calkin (Lagrangian and Hamiltonian mechanics). Maybe someone who knows can help me. In Exercise 1.01, in the solution they set "sin (PI * x/2a)...
View ArticleEquation to determine velocity in a tube connected to a manometer
Can I use this equation to determine velocity at the entrance in a pipe connected to a manometer V1=√2ghp'/p
View ArticleDerivation of an acceleration
Two boxes are side by side on a floor with friction, from the left a Force acts on them. To be more concise about the picture it is this one on this website:...
View ArticleCalculation of thin film thickness from complex refractive index
Hello, I want to ask how can one calculate the thickness of a thin film (or each of the thin films in a stack of 3-4 thin films on one another) when - complex refractive index of each thin film is...
View ArticleHeat Transfer
Hello Gentlemen, Long time reader first time poster. I have a problem that I am trying to solve below. Problem 1 A metal copper rod say 20mm diameter has a constant heat applied to it of 150°C on one...
View ArticleInteraction of two magnets
I've attached a video of magnetic putty swallowing a rare earth magnet. Will the resulting shape of the putty be cubed like the rare earth magnet (equal distribution of magnetic forces along the...
View Articleuninsulated electrical coil
So an insulated electrical wire coiled around metal can create an electromagnet, but what happens if the same wire isn't insulated, and simply makes direct contact with the metal object it is coiled...
View ArticleHow to derive the equations of oscillation
I am new to this site. I have a problem with the derivations of second order equations for SHM. F= -kx F+kx+0;ma+kx=0 m(second time derivative of x)+k(first time derivative of x)=0 As my text book says...
View Articlecanonical Ensemble and potential energy
Hi guys :cry:, I regard an ideal diatomic gas which is in a Volume x,z and got a angular [itex]\phi[/itex]: [itex] 0 \le x \le L[/itex], [itex]~~~~~~~~~~~~ 0 \le z \le \infty[/itex], [itex]...
View ArticleIdeal gas partition
Two ideal gases are separated by a partition which does not allow molecules to pass from one volume to the other. Gas 1 has: N1, V1, T1, Cv1 for the number of molecules, volume it occupies, temperature...
View ArticleParallel RC circuit
Hello, I know that if two resistors are in parallel or two capacitors, they have the same voltage. However, is it the case that a resistor and capacitor in parallel also have equal voltage?
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Conservation of energy (and rotational kinetic engery)
This is not a homework question. An adult exerts a horizontal force on a swing that is suspended by a rope of length L, holding it at an angle θ with the vertical. The child in the swing has a weight W...
View ArticleDo I have to re-define electric field strength in Centre of Mass frame
So lets say I'm computing the torque as a result of the interaction between two electric dipoles in the lab frame. Lets imagine they are in some electric field. I then do : τ = r×F If I now switch to...
View ArticleCanonical Internal Energy
Hi, I regard an equation for an canonical ensemble. I do not understand why both equations should be equal. [itex]\bar{E}= -\frac{ \partial \ln{(Z)}}{ \partial \beta} \overset{\text{?}} = k T ^{2 }...
View ArticlePartial Derivatives of the Position and Velocity Vectors of a Particle
Hello guys! Lately I've been studying some topics in Physics which require an extensive use vector calculus identities and, therefore, the manipulation of partial redivatives of vectors - in particular...
View ArticleDifference between W/Q and E/Q in Electricity
In the Electricity section of the AQA A Level Physics data sheet (link given bellow) it includes these 3 equations: http://store.aqa.org.uk/qual/gce/pdf...5-W-A2-DFB.PDF V=W/Q Emf = E/Q Emf = I(R+r) I...
View ArticleFinding vector potential
Hi PF members, I have a question about how to find the vector potential from a given electric field. For example, [itex]\textbf{E}=-\nabla\phi-\partial\textbf{A}/\partial t[/itex] and...
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