difference between the two following formulas
Can some one please tell me what is the difference between the two following formulas and when it is used: dQ=dU+dW dU=dQ+dW
View ArticleSound Power - dB to Watts
I didn't think it would be this hard to find the answer to this, but 1 hour of googling has come up with nothing that I can make sense of. The main cause of my confusion is that there's about a dozen...
View ArticleWave Equation After Reflection
What do the components of the following equation represent : http://www.mediafire.com/view/?0we6f9jkw26qi9o To be clear, this represents a wave of the form Acos(kx-wt) after being reflected off a wall....
View ArticleE field outside a conducting body
Say we have a +Q charge located inside an isolated spherical conducting body and I want to know the E field at some point P outside the conducting body. I reliase that since this is a conducting body,...
View ArticleDiesel, Otto , Joule TRICK???
Hi Guys, I try to callculate the efficiency for a cycle Process. For Diesel, Otto and Joule Processes you can write the efficiency as a really small equation. I have seen that for example sometimes the...
View ArticleBragg Law and Effect of Doubling Wavelength
My lecturer discussed bragg's law a few weeks ago and described how the angle theta changes as the wavelength is doubled. I cant seem to duplicate his result. I know that the bragg condition for a...
View ArticleWill two orthogonally polarized light beams interfere?
If Beam A (BA) is polarized vertically, and Beam B (BB) is polarized horizontally, can BA and BB still create an interference pattern if put together. For example, in Youngs Double Slit experiment, say...
View ArticleFrequency away from an oscilatting body
This is the set up to the question that we got for homework: Pit and Plank. A wooden plank is placed over a pit that is 5.00 m wide. A physics student stands in the middle of the plank and begins to...
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3DOF Reentry Trajectory Equations of motion
I'm working on a project for myself in regards to atmospheric reentry. I've come across some equations that describe the reentry trajectory. I decided to derive the equations using the diagram shown in...
View ArticleResolving Power - Disadvantages
So I know resolving power is given by : Resolvance = λ/Δλ = nN Where n = order of fringe being observed and N is the no. of slits. So I was thinking there are a few ways of increasing resolvance : 1.)...
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The concept of rotational equilibrium
Here is a text from my Physics Book : The net external torque on the object about any axis must be zero for it to be in rotational equilibrium. I divide the torques into two categories, anticlockwise...
View ArticleTV Screen & Bracket Moment Question
Hi all, Can anyone help me with (what I think is) an equation relating to moment. I want to know what the point load will be on a wall with a TV screen and articulated bracket. The screen weighs 25kg...
View ArticleForce between Current Loops
I am working on a problem involving force between two loops of current. The problem is to prove the for any arbitrary loops of current, Newtons third law holds true. I understand the basics of the...
View ArticleGauge condition
what is physical meaning of Lorentz gauge condition in classical electrodynamics??
View Articleunreal source in lense
I was having trouble while thinking about the unreal source for refreaction through a lense... In lense light is refracted twice...the real image for the first refraction works as an unreal source for...
View ArticleWhat is wavelength of light a measure of?
Is it the wavelength of the electric portion or magnetic portion or something else entirely?
View ArticleMagnetic Susceptibility VS. Relative Permeability
What is the difference between the two and what are the applications of them in a magnetic material?
View ArticleField lines and conductors
So I'm a little confused. My question is: If a conductor is placed in an external electric field, do the field lines penetrate the conductor? My original thought was yes they do and then the induced...
View Articlehow determine aspheric lens beam angle?
Hi, I'm using an aspheric lens with a LED light source for a DIY projector. As I understand it, if I place the led light source at the focal length of the aspheric lens, the light should be...
View ArticleKinetic energy question. (layman)
Hi all. English is not my native language, so bare with me (joke i found googling the right word). Im from Argentina. My question. If i throw a ball, i have learned it has kinetic energy. But if motion...
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