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Thermal transfer improvement from adding fins
Hi All, I'm designing a heater for some cylindrical tubes. In my original design, I simply had a flat plate contacting the bottom of the tube. Since the tubes are only conducting on the bottom, the...
View ArticleCentripetal acceleration
My question is about the centripetal acceleration formula |a| = ω^2*r. If we keep the angular speed constant then why does increasing the radius increase the centripetal acceleration? I don't find this...
View ArticleEvaporation questions about saturation pressure...
Hello I have a few fundamental questions about evaporation 1. In Cengel's Heat and Mass Transfer, in all sample and practice problems the author assumed without explanation that for a system such as a...
View ArticleMovement of elements in a linear deformation
Hello all, I have a question regarding the deformation of an object. Imagine that I have a cylinder which I apply a force to at each end. It's easy to determine how the cylinder stretches and...
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very basic fluid statics and dynamics question
consider the image on the drawing at the top (above the yellow arrow) if i had some non-compressible fluid enclosed in a pipe like container that looped back in on itself (as shown in figure), and if...
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Combined translational and rotational motion of a rigid body
The velocity of any point P of a rigid body in rotation plus translation is [itex]\vec{}v[/itex]p=[itex]\vec{}v[/itex]COM+[itex]\vec{}v[/itex]p,COM. Now |[itex]\vec{}v[/itex]COM|=v and...
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Slope rotating around a vertical axis.
This is NOT a HW question. I'd appreciate an explanation of the following: I would like to determine the forces acting on a mass set between two springs of constant k on a slope (the slope's angle is...
View ArticleLegendre polynomials (related to E&M)
Edit: Figured it out! [itex] ∑ A_lR^lP_l(cos\theta) = -E_0Rcos\theta + ∑ \frac{B_l}{R^{l+1}}P_l(cos\theta) [/itex] Goes to, [itex] A_lR^l = \frac{B_l}{R^{l+1}} [/itex] for l = l' not equal to 1
View ArticleKramers-Kronig relations for the wavenumber
Hi all, I am wandering if I can apply the Kramers-Kronig (KK) relations to the complex wavenumber k(ω) = k'(ω) + i k"(ω). I have a measurement that easily gives me k'(ω) for a certain range of...
View ArticleTurbine Power calculations
Hi, this is my first post on this forum, although ive often refered to many posts for random information, so thanks to all the people who dedicate time to other peoples questions, I greatly appreciate...
View ArticleEntropy at lowest energy
Why entropy is highest at lowest energy? Entropy is disorderness.So low energy means low disorderness.But why it is highest?
View ArticleWhy must a charged particle be accelerated to produced photons?
Suppose you have an electron moving at constant velocity. This new area that it is moving into initially had 0 electric flux through it but now that the electron moves to that location the electric...
View Articledark border around light
hi, recently i notice that there is a dark border around all the streetlight at night. what is this phenomenon called? thanks
View ArticleWaves and SHM
1)What is the difference between standing waves,beats and normal interference of any 2 waves ? 2)Is beats in sound waves same as interference in light waves ? 3)Why do we represent particle...
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Rollover calculations
Hi Is this formula all i need for finding the speed i need to tip the trolley?
View Articleweird question about torque
if a rigid body, lets say a disk,is floating in space and we exert a force outside its center of mass will it rotate or just start a linear move? its center of mass is free to move.sorry if my English...
View ArticleCan you add potentials if charge redistributes?
Let say we have charged conductor M and we know its potential energy function Vm(r) when M is isolated from any charges. We also have charged conductor N with potential energy function Vn(r) when it is...
View ArticleWhy is this calculation of earth gravitational acceleration incorrect?
Hello there, I was taught: [tex]a = {v^2 \over R}[/tex]. I substitute [tex]v[/tex] for the speed of the rotating earth at the equator, and the radius, [tex]R = 6378m[/tex]. And I get [tex]a = 0.03 \rm...
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Conservation of angular momentum.
Why is angular momentum conserved around the bottom left corner in the following set up (see attachment)? The attachment shows a square of side a and mass 4m, and a body of mass m leaping with velocity...
View ArticleLiquid, collision rate
In kinetic theory a liquid is viewed as an incompressible substance in which the atoms are free to move. I would like to know how to find an expression for the molecular flux in a liquid. By molecular...
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