capacitor -- Work done to charge it up
If we imagine a capacitor as two conductors held a distance d apart from each other, we can find easily that the total charge and the potential are proportional: Q = CV To find the energy stored in a...
View ArticleClik here to view.
First sem. calc physics: Cable tension (vectors and acceleration)
So, I'm trying to understand how tension works between a cable. No, not homework. A book example. I have the answers. a = 0.679 m/s2 t = 12s Quote: A 70-kg climber finds himself dangling over the edge...
View ArticleExplaining Avogadro's Law using kinetic theory
So far I have found a kinetic-theory explanation of the Boyle's Law, Charle's Law, and Pressure-Temperature Law. For example, for the pressure-temperature law: increasing the temperature of a gas while...
View ArticleClik here to view.
Formulation rigid body constraint
Hello I need some help with formulating the constraint force for a sliding and rotating box. The scenario is: A box is sliding down a slanted table. The center of gravity has passed the edge of the...
View ArticleInterpretation of grand potential.
Hello! I understand Gibbs energy and Helmholtz energy, but how is grand potential to be interpreted and where is it useful? For instance, Gibbs energy is the maximum amount of energy that can be used...
View ArticleMoment Of Inertia of broken disk or ring confusion
We all know that M.I of a Uniform rigid rod about an axis perpendicular to it's length and passing through it's center is MLsquare/12.Where M is mass and L is length of the rod. If it is broken to half...
View ArticleExternal driving force on "blackbox" system: frequency response
Easy question: I have a blackbox system (it's actually the Earth, but we can just treat it as a blackbox) driven externally by a periodic sinusoidal force (the Sun). If the driving force has a period...
View Articlekinematics - average velocity
Hello, I have problem with this example. I don't speak English very well, so please forgive me if something isn't quite enough defined - as it should be in English Physics terminology. The train moves...
View ArticleClik here to view.
Hamiltons principle
I have some trouble understanding how my book introduces the variational formulation of mechanics. On the attached file I have stipulated with red a part, which I do not understand at all. What is the...
View ArticleClassical physics and Group theory
You know that the current theories in particle physics are expressed in the language of group theory and the symmetries of the theory describe its properties I don't know how is that but my question...
View ArticleProperties of reflected light
This may sound stupid, but why when I shine a laser pointer at a mirror and reflect in onto another mirror back and forth, the points of light make a parabola when the mirrors are tilted in such a way...
View ArticleMoment of Inertia of a body with linearly increasing density?
A thin wire of length L and uniformly density ρ is bent into a circular loop with center at O.The moment of inertia of it about a tangential axis lying in the plane of loop is. Ans : Mass M is not...
View ArticleWhy cant I get conservation of energy here
Okay consider this system one dimensional system: We have a positive charge at the origin. Far out at infinity on the x-axis we have a positive charge and at minus infinity on this minus x-axis we have...
View ArticleDetermining angular velocity radius and velocity of the center of rotation
Hey, I am trying to solve the following problem: va=vr+ ω × rra vb=vr+ ω ×(rra+rab) vc=vr+ ω × (rra+rac) I know the vectors va, vb, vc, rab and rac and I want to know the angular velocity vector, the...
View Articlevisualizing field lines with moving current
Let's say I have a circle filled with positive charges. Some distance away I have an identical circle filled with negative charges. Since the distribution is uniform in the circles, I can just use the...
View ArticleClik here to view.
Calculating mutiple forces on a body
Hi I am making physics engine (computer) and i have some problems with interpretating multiple forces on one body. On the fourth car (on right) there are two forces acting on two rear wheels,...
View ArticleCan't seem to integrate this rectilinear motion equation.
Hi, so I have a question where it asks me to find the distance between t = 0 and t = 60 for the equation v = 1/6(t(60 - t)). First I had to find the values of t which the object moving was stationary,...
View ArticleSpring Vibration Abilities
Hi all, I have a bit of a practicality problem here I was hoping I could get community consensus regarding. This question revolves around vibration throughout a mechanical setup and I haven't exactly...
View ArticleElectric field boundary equation implication at air/earth interface
From an EM textbook (dealing with an above surface time varying magnetic field source): Primary field: Field artificially produced. Secondary field: Field produces by the charge/current created by the...
View ArticleAverage Acceleration (gravity question)
Hello. I was doing some physics and I came across a problem involving gravity. The problem was finding out how long (in disregaurd to atmosphere) long (time) it would take for a body to reach earth....
View Article