Need experimental information on plasmas
I'm new to the subject of plasma (and to the forum) and would like to find some book or online information on "phase diagrams" for plasmas, i. e. at which temperature and pressure and potential...
View ArticleQuestion about phase constant
we have the wave equation as follows with non zero phase constant: y(x,t) = ym * sin(k( x - PHI/k) - wt) or y(x,t) = ym * sin(kx - w(t + PHI / w)) I don't understand where did the PHI /k or PHI / w...
View ArticleA question regarding batteries
Hi if you have a galvanic cell, with Zink at the anode and Cu at the catode, which force then makes Zn electrons go to the cobber catode?
View ArticleApparent and actual radius (Optics!)
I know the radius of a circle. I'm taking pictures of the circle as I bring it closer to the camera. Obviously the radius is getting larger. I want to know what the relationship is to find this out? I...
View Articleheat sinking to Aluminum block and dissipation
I am curious if someone can help be estimate heat sinking and dissipation in an Aluminum structure? What I am trying to do is is cool a hot liquid by just allowing it to heat the structure it is in...
View ArticlePlasma, which formula to use
Hello. I didn't count examples about plasma at school. Never yet. I'm trying it study on my own. I do not know what to do with a few examples. I do not know which formula to use. I give here one of...
View ArticleStanding Wave Speed?
My Friend and I were discussing standing waves and I made problem about speed, inspired off a concept taught in my Physics book: [itex]v = \sqrt {\frac {F_T}{m/L}}[/itex]. My Friend asked a very valid...
View ArticleNewton's Second Law
I'm just uncertain (haha), what IS newton's Second law exactly? F=ma, or F=dp/dt, aren't these defining equations for F itself? what is a force? what would you mean a "force" acts on a object, would it...
View ArticlePoisson Bracket for 1 space dimension field
Hi, Suppose you have a collection of fields [itex]\phi^i (t,x)[/itex] depending on time and on 1 space variable, for [itex]i=1,...,N[/itex]. Its dynamics is defined by the Lagrangian...
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Need solution to view through glass at near zero angle
Hi, I am designing a device which has cameras need to see through a sheet of glass at angle very low, near zero. And at that angle most of light is reflected so it is very hard to see. - The surface of...
View Articleelectromagnetic hamiltonian factor of 1/c question
I often see the EM Hamiltonian written as $$H=\frac1{2m}\left(\vec p-\frac ec\vec A\right)^2+e\phi,$$ but this confuses me because it doesn't seem to have the right units. Shouldn't it just be...
View ArticleSum of work = Work done by net force
Suppose you have many forces acting on an object, and the object moves in space in some time interval. Each force has done some work on the object. Suppose you took all these values for work, added...
View ArticlePressure At Surface And Scale Height
Please can someone tell me if my thinking here is right... I've got a planet with an atmospheric pressure at 6km of 0.5 P0 and at 8km of 0.4 P0 (P0 = pressure at the surface). I want to work out the...
View Article3 dimensional torque from angular velocity
Hello, I am currently making a video game and have run into a bit of a physics problem. I have taken two semesters of physics in college (wasn't too great at it) so I know how to do simple things. I am...
View ArticleCalculating Optical waveguide geometry with parameters
Hello all, is there a way to calculate the width of a waveguide required (slab and ribbed) made of silicon with refractive index 3.47 of 220nm height, using 1550nm laser, based on a variable...
View ArticleHow to calculate energy density of mainspring?
Hi, How do I calculate the energy density of either a main-spring (like in a clock) or a motor-spring? Can someone show me values put into the correct formula for something like steel? I did find some...
View ArticleWhat is the theoretical minimum power required for thrust relative to...
I understand that for a fixed massflow the minimum amount of power required to generate a thrust is: P = Massflow * ∫v dv = massflow *0.5* [v2^2 - v1^2] However, is it possible to produce the same...
View ArticleVertical Spring
Let's say we have a vertical spring. As it oscillates, the energy bounces between gravitational potential energy, spring potential energy, and kinetic energy, right? Why does my lab say that spring...
View ArticleSimple Harmonic Motion
[tex]x(t)=Acos(ωt+ϕ)\\v(t)=-ωAsin(ωt+ϕ)[/tex] I think my physics professor said in one of the lectures that: after setting up your position function by finding amplitude, angular speed, and solving for...
View ArticleDifference between simple harmonic motion and stationary sinusoidal wave?
Their equations are identical. Is there any difference between the two?
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