water analogy as electricity explanation
Thinking of a restrictive pipe as an analogy of a resistor, which converts electrical energy to heat, would a pipe demonstrate a rise in temperature related to the loss of energy in the water, ....
View ArticleLagrangian vs Newtonian formalism
I have seen the lagrange equations derived from newtons laws in the special case, where forces were derivable from a potential. Now with the introduction of hamiltons principle, I think my book wants...
View ArticleElectromagnetic potential well, impossible?
I was having a discussion with my friend the other day. He had just attended a lecture about Paul traps. He told me that the Paul trap potential has a stationary point in the middle, which is a saddle...
View ArticleExperiment with Faradays law
Today we did an experiment with a solenoid through which we varied the current. Around this solenoid, was a different circuit (not coupled to the coil-circuit) where we measured the potential across a...
View Articlepulling current for charging and current limiting devices
I had a few questions about circuits. I am a mechanical engineer so I don't have very much knowledge in electrical theory, just basic stuff, but I have been working on some basic circuit design and...
View ArticleBrownian motion...ish
Suppose I have a large particle of mass [itex]M[/itex] that is randomly emitting small particles. The magnitude of the momenta of the small particles is [itex]\delta p[/itex] (and it is equal for all...
View ArticleThermodynamics question
I am trying to understand what will happen to the temperature under these conditions (starting temp T1 = 273K). I compress 1 atm air adiabatically to 200 atm. Using the formula T2/T1 =...
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How to calculate forces on a wheel
I have seen a lot of different formulas about the forces acting on a wheel. So now I don't know what to use. So, I have a vehicule with 4 wheels ( Ø 200 x 50mm) with a load of 900KG. I want to know 3...
View ArticleExperimental proof of retardation in EM fields
In the light that QED suggests the speed of interaction is infinite, are there any experiments which makes it clear that mediating fields are retarded in classical electrodynamics ? Whereas, on the...
View ArticleWater cooling
Hi! I am trying to design a water cooling system that could cool down my computer from 100C to about 40C, with 600W of energy being provided by the components. Could a system that moves 0.2l of water...
View ArticleG Force upon falling object on impact
Hi Guys, I have been asked to find out at what point a measurement device go out of calibration when dropped and express that in a g as in G force. Its been 15 years since I studied physics (for 3...
View ArticleMagnitude of friction on the driving wheel
After discussing this with my friend using our O level knowledge, we came to a conclusion. But we have some queries. So firstly, we have our driving wheel on the air and the engine is turned on. So the...
View ArticleWhy do we rotate along with the earth?
Do we rotate along with it because of it's gravitational pull? Or is it friction?
View ArticleAcceleration
Hi everyone. I am a programmer and I think some basic physics will help me to achieve something I wanted to do. I want to move an object on the screen a fixed distance in a fixed time, but rather than...
View ArticleBest propellant for space shuttle?
The Swedish SMART-1 used a Hall effect thruster which used Xenon gas. Xenon costs 1200 USD per Kg. Why didn't they use Helium instead which costs 50 USD per Kg? New Horizons probe launch in 2006 used a...
View ArticleIon Thrusters - How much do they cost?
Ion Thrusters which are used for space vessels, such as sending sattelites into space, how much do they cost?
View Articleconservation of linar momentum - variable mass
If a railroad car traveling down a straight, frictionless track encounters vertical rain that fills it with additional mass, will the velocity decrease in order for the momentum to be conserved? Will...
View ArticleConfusion on mechanics.
Hello, I just started basic mechanics and what seems to mess with me is this: take a 1kg cube in a string, with how much force do you need to push it to give it the even speed of 2M/S, In the book it...
View ArticleProblem Introducing Me to Sliding Friction
I'm going through the problems at the back of a chapter in my physics book where all the challenging questions are. I'm able to solve most and comprehend the rest, however, there's one that's...
View Articledifficulty in differential form of gauss law
hi all, im new at electromagnetics and vector calculus, so facing these trivial problems. The differential form of gauss's law for empty space states ∇E = ρ/ε .The right side refers to charge density...
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