Laboratory system to COM system conversion
I have calculated the double differential cross section of certain reactions at different outgoing energies and angles in the Laboratory system. I now need to convert the cross sections calculated, the...
View ArticleVelocity Profile
What is a velocity profile in fluid mechanics? Why do they give you a ratio between the fluids velocity and a random reference velocity and why is it equal to a completely arbitrary function? Does the...
View ArticleEffective Mass of Spring
Okay, so I've been trying to figure out what would be the time period of spring of mass 'M' & spring constant K which is hung vertically from a ceiling. Dividing the spring into n equal massless...
View ArticleConservation of energy flywheel experiment
Hi Ive recently carried out an experiment where different masses are hung from a string and then dropped from the same height. The other end of the string is wrapped around the axle of a flywheel and...
View Articleboundary layer in pipe flow
Hi I cannot find an equation for a boundary layer in a pipe flow (laminar). I am looking for an equivalent of the equation δ(x)=4.91x/(√Re) that works for a flow between plates (x is the distance...
View ArticleFlywheel Inertia value
Basically, for a standard flywheel (heavy Metal disc), Is its moment of inertia a fixed internal quantity for that flywheel which doesnt change dependent on angular velocity etc?
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Recover energy from unique temperature
Why is not possible to use this simple cycle for recover energy from unique temperature ? 1/ (first drawing) For limited friction I think it's possible to put outside pressure of 10 nPa. The speed...
View ArticleConservatino of Momentum
I know the totoal momentum and the total energy is conserved during the collision. And total energy is equal to the internal energy and the kinetic energy of the object. But I still can not see the...
View ArticleOrbiting loses energy
The original planetary model of the electron orbiting the nuclear did not make any sense because the electron would lose its energy so quickly and the atom would collapse within a tenth of a second....
View ArticleCan the electromagnetic vector potential be written in terms of a complex field?
Is there a complex field that when properly interpreted yields the four components of electromagnetic vector potential, A_0, A_1, A_2, and A_3? Somewhat along the lines of the complex field ψ yielding...
View ArticleWhy does a Scale Balance Horizontally?
This may seem like a really dumb question, but I can't figure out what the answer is, so please just bear with me. Why does a balance that is equal come out straight? If one side is tilted slightly...
View ArticleHow does a trampoline work?
I was hoping that somebody could explain the physics behind a person bouncing up and down the trampoline. I know the basics as far as what happens to Kinetic Energy, Elastic potential energy, and...
View ArticleEquilibrant or Equilibriant?
What is the correct spelling of the word? I've always used equilibriant but I've now heard it should be equilibrant. Any insight into this dilemma?
View Articlestuck on derivation of Euler's equations in rigid body dynamics
i was reading about derivation of Euler's equations for rotational dynamics (john taylor, classical mechanics, chapter 10) when i got stuck on one of the reasonings essentially it refers to the moment...
View ArticlePath of current functional
Current follows the path of least resistance or shortest path. I just want to prove this or rather reproduce it using calculus of variations. I just want to show it in a fancy way. I want help to form...
View ArticleThermodynamic Derivation of Wien's Law?
Can someone tell me how I can derive Wien's law, i.e., [itex]\lambda_{max} T = constant[/itex] where [itex]\lambda_{max}[/itex] is the peak wavelength and [itex]T[/itex] is the absolute temperature of...
View ArticleCan a device use more wattage than it's rated for?
We're talking about high-wattage things like boilers, radiators, etc., things that use something like 500-1500W an hour, but aren't as advanced as computer hardware (where you can tune everything in...
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Length of the vector (electrostatic cylinder)
My problem is that I'm confused about a hint I was given in this problem. I usually use the law of cosine to find the length of [itex]\vec{r}-\vec{r'}[/itex]. But the hint here says that I should make...
View ArticleInduced voltage in a coil
Hello. Say I have a single turn of a coil in an external magnetic field. How do I calculate the voltage induced in this turn ? Initially I would use Faraday's law ∇×E = -j ω B But what should I use for...
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Magnetic Generator Power Rating
Hi, I am very new to this, so if my questions sound a bit stupid please point me in the right direction. I want to build my own 2.5 kW magnetic generator, but would like to understand a bit more how...
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