Falling object collision question
Hello, I've been trying to figure out the physica behind a collision of two objects due to the force of gravity. Here's the situation as I'm picturing it: A massive object A is falling due to gravity...
View ArticleHow does table exert force on me?
I now this is a very fundamental idea, that when I slam my hand on a table, the force that I exert on the table is also exerted back to my hand, if this were not true then the table would move in the...
View ArticleQuick question about Gibbs free energy
In the expression defining Gibbs free energy, G = U - TS +pV, are T and p the temperature and pressure of the environment, or of the system itself? Or is it a requirement that the system has the same...
View ArticleSteady state conduction in a hollow sphere
Hello, I'm having trouble with a conduction problem, I have access to the answer but not the solution. I did it on my own and my value is half of what the answer is. Now, my calculus is a little rusty,...
View ArticleNeed help finding the name of a fluid mechanics/frequency graph
Someone showed me a graph that has to do with how a cylinder oscillates in uniform flow, starting from no oscillation, to high oscillation, back to none. I know the y-axis is amplitude/diameter and the...
View ArticleQuestion on phasors at boundary of oblique incidence.
A plane wave travels in ##\hat k_I=\hat x \sin\theta_I+\hat z \cos \theta_I## direction hitting a boundary formed by xy plane ( z=0). The incidence wave is in the plane of incident formed by xz plane...
View ArticleHow to derive 3D body motion from accelerometers
Hello All, Is is possible to the derive pitch, roll and translational acceleration, and the location of pitch and roll axes from a set of tri-axial accelerometers mounted on a rigid body? My initial...
View ArticleTension in belt drive system
Hi I would like to know, does the torque required to turn a pulley increases if you increase the tension? I have a system like this: pulley motor pulley car and a belt goes around this system, the...
View ArticlePendulum - How it affects gear train torque?
Does the gear train in a classic weight driven clock see a torque decrease when we lengthen the pendulum? thanks guys for your help - (inventor question)
View ArticleStock's theorem and calculation of current density
Hi, I'm trying to use stock's theorem with the following magnetic field - [itex]B=1/r\hat{\theta}[/itex] on Cylindrical coordinate. From one side I get - [itex]\nabla X B=0 = \mu \int\int J \cdot...
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Differential pressures in a chamber, revisited and clarified
This is a clearer, better drawn, and shorter version of a question I asked a few days ago. I apologize for not initially reducing it to this state - sometimes when reducing a question to its essence I...
View Articlestress tensor rotation/shear stress
Hi. I have a huge problem and without solving it I can't move forward. I will appreciate any help. Having the stress tensor S: 163.666557052527 -63.0272557558942 0.000000000000000E+000...
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In the Stern Gerlach experiment, electron beam acceleration question
In the Stern Gerlach experiment it would seem that an electron beam moving at some velocity bisecting the upper magnet on a horizontal path would be radially accelerated perpendicular to the direction...
View ArticleConfusing Units after using Bernoulli's Equation
So in a spacecraft with regular air at 1 atm pressure, a hole gets punched in it (depressurizing it). I'm looking for the Exit Velocity of the air at t=0. Using Units: Internal Pressure: Pi = 1 atm =...
View Articleinformation carried by ray of light
Does the light ray that had hitted a body carry the information about the body that it has hitted? Because when we see our own image in a mirror the image is same as of us. so do the photons of light...
View Articlesingle slit width change, how would fringes differ?
just to be clear, this is single slit diffraction of light if the slit width is made narrower, this would lead to more diffraction, so the fringe width would be wider, yeah? but I'm a bit confused,...
View ArticleCorrecting camera distance with zoom
So I have four pinhole type cameras in my experimental setup. All of them have the same magnification and are placed at the same distance away at different locations except one which has a different...
View ArticleLooking for image theory regarding magnetic elements.
Are PMC always metal compound like Iron etc. That has high ##\mu##? So most of good magnetic conductor are themselves electric conductor? From articles I read: PEC ##\Rightarrow\;\hat n \times \vec...
View ArticleDescribing system in terms of 2 variables vs natural variables
I often see a function's differential expressed in terms of convenient partial derivatives eg dU=(dU/dT) dT + (dU/dV) dV And I've seen it written that "any system is uniquely specified by two...
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Tracing seismic rays - possible intersection
This problem is about seismic wave propagation in a non-homogeneous layer over a halfspace. I'm not asking you to solve anything, I've already solved the problem both algebraically and in Matlab....
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