conservation of charge
I show the conservation of charge from the equations of MAxwell, but I suppose that an electric field is continuous at space and time, therefore I can exchange the derivates from Gauss' law, at time's...
View ArticleBTU transfer of stainless steel pipe
I know this is a complicated question, and depends on a lot of factors. So, I will do my best in explaining the situations. I am trying to regulate the temperature of a pool of circulating water. I...
View ArticlePropagation of electromagnetic waves
hi pf, i have been trying to understand since last few weeks how electromagnetic waves, say light travels? Not the way transverse waves do. It must require a medium. Then in vacuum how light travels?...
View ArticleIs angular momentum conserved if you move off at a Tangent ?
Lets imagine a binary system of two astronauts in space connected to one another via light rope. The rope is taut and they're spinning round and round with their axis of rotation being the the axis...
View ArticleContinuum Mechanics Simulation; need some help with the math
Hello all, Background I've been playing with computer simulations quite a bit recently, and wrote one that crudely simulates the formation of star systems. My first version was a conventional many body...
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See saw weight balance
Hi everyone , I have a small question .. I have attached a ppt . I am having two sensors which can measure the weight of my object at two end position so fmy support .. My question is that can i find...
View ArticleHelp with plotting a graph in MATLAB
Hi, I am trying to plot a graph representing the discharge of a capacitor in MATLAB, having defined the following function: function f = discharge (x,a) f = a(1) + a(2)*(exp(-x/a(3))); Problem is, when...
View Articleclausius inequality temperature
in the clausius inequality is the temperature that of the system or of the surroundings? or is it temperature of the body receiving positive heat? (assuming the irreversibility is due to heat transfer...
View Articlesolonoid with iron core
How do i calculate the amound of windings I need to make an solonoid electro magnet with around 1 T.. I checked with google, and there seesm to be a lot of different formulaes which confusses me alot..
View ArticleWhy is the front paddle gear larger than the rear wheel gears?
As titled: When moving at a constant velocity, say drag force is the only resistive force, don't we want to amplify the force output? why would we want to use a larger gear for the paddle than the rear...
View ArticleApplying the conservation of energy law to electrical circuits.
Hi guys, I've realised that to truly, deeply, and fully understand something it often helps if you think about the conservation of energy, and then just build up from that. So here I have tried to...
View ArticleBasic questions about electric charge
Hello, I just started to read up on some basic electromagnetism and have some questions on: 1) Why do the electrons flow from the glass rod to the silk when you rub it? Why the preference for the silk?...
View ArticleParallel/Series Combination Circuits
I understand the concepts of whether a resistor is in parallel or in series with each other. But I thought of a weird case that i can't seem to find examples for. http://imgur.com/b2YMOnA In this case,...
View ArticleDoes slow leakage cause a large entropy increase
Let's say a container leaks out three molecules at times 1, 7 and 16 Another better sealed container leaks out three molecules at times 7579, 46739 and 345650 It seems like entropy increase is larger...
View ArticleDiffraction Grating And Lightbulb
An incandescent lightbulb produces incoherent light. But on Wikipedia, for instance, there is a picture of it producing a rainbow diffraction pattern on the diffraction grating page. But since the bulb...
View ArticleWhat gives the electron the energy to continuosly orbit
What gives the electron the apparently necessary energy to keep orbiting the nucleus for the vast time periods that this has occured for? The electron is a moving charge, so is there a potential...
View Articlewhat is the max free air heat transfer coefficient(film coefficient)?
what is the max free air heat transfer coefficient(film coefficient)? at 1000 c? i have a object that is at 1000 degree c by applying 900watt. i model it solid edge and apply heat generation load of...
View Articlemodal energy distribution in closed pipe resonance
When one causes the air column in a closed pipe to vibrate in its well-known modes (harmonics) or a plucked string to vibrate similarly, how is the exciting energy distributed amongst the modes?
View ArticleIf the net work is zero. Why is the object still moving?
Hi I have a ball, and I'm lifting this ball upward with +work, and gravity is doing -work, Net Work= zero. But how is it, that I can still move the ball. When read that explanation I think of the ball...
View ArticleTrouble with potential energy
Hi everybody, I'm reviewing for the MCAT (it's been a while), and I'm having a lot of trouble understanding potential energy. In my review book (and a whole bunch of other googled sources), it defines...
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