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Hydrostatic forces on a curved surface
Hello, I'm trying to go through an example problem in a fluid dynamics textbook, and I'm having trouble understanding some of their logic. The problem deals with a solid cylinder of radius 0.8 m hinged...
View ArticleBouyant Force on submerged hollow object with air trapped inside
Hello, I'm reading about buoyant forces, but my book does not mention anything about an object with air (or any gas/fluid whose density is less than that of the fluid the whole object is immersed in)....
View ArticleFormal definition of Dirac's delta and charge densities
Hi, i'm new to this forum but i've been aware of its existence for a while and it's pretty cool. I finally came up with a question to post so here i am :) I've read a few nice posts on this forum about...
View ArticleProblem with proofing polarity of the reflected and transmitted wave.
This is an exercise problem, BUT my question is not the exercise, but the fundamental assumption of the problem. That's the reason I don't post it in the homework section as it has nothing to do with...
View ArticleNewtons 3rd law - how can this rope move?
Hi I'm having trouble understanding this situation. Appologies if I posted in the wrong place, this is pretty simple but it's not really a homework question. A horse is attached to a large stone by...
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Draw the eqivalent circuit.
http://www.physicsforums.com/attachm...1&d=1369885070 Attached Images DSC05435.bmp (351.6 KB)
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How to proof the polarity of the reflected wave of Oblique incident.
As shown in the attachment, the book assumes ##\hat E_{||}^r=\hat y_r=(\hat x \cos \theta_r +\hat z \sin\theta_r)##. Why? How do you proof this. I have another post here about the Normal Incidence and...
View ArticleNon uniform waveguide
Hello everyone, I'm trying to solve a problem but I want to find a simpler way if possible. The basic idea is that I would have one waveguide, for simplicity I will just take a slab waveguide. However...
View Articlelorenz and coulumb gauge
i am searching the physical significance of lorenz and coloumb gauge but cant find anything besides that coloumb gauge is used for finding time independent potentials while lorenz is for finding time...
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Please clear this doubt on Coriolis force problem
Hello I have this doubt about the direction of Coriolis force on a mass moving on a rotating turntable. (pl see the attached document) Any clarification is most valued. Thanks in advance Attached Files...
View ArticleThe electric intensity E, current density j and specific resistance k
The electric intensity E, current density j and specific resistance k are related to each other by the relation please explain
View ArticleBlack Body Radiator vs painted surface
Recently on an aquarium related forum, I called out someone for making what I considered to be an outlandish claim and I was supported by several others. However I wish to get the opinion and/or facts...
View Articleaverage power or peak power?
Something that i have wondered for a long time is when an optical components power handling capability is discussed, is it the average power or peak power that is in question? Thanks.
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[Optics] Geometrical scattering question
Hello, I'm preparing a presentation on light scattering by particles and found the following image of light scattering on Rayleigh, Mie and geometrical scattering: So I understand why in Rayleigh...
View ArticleUltimate Strength vs. Young's modulus
What is the threshold where Young's modulus stops being applicable, and ultimate strength becomes relevant?
View ArticleEquation for force from Vf, mass, and joules?
So I'm doing some research regarding firearms and need to know the amount of force on the bolt assembly as the bullet is fired. Using a .45 caliber Federal bullet, the mass of the projectile is 15 g,...
View ArticleDiffraction Vs Uncertanty
I couldn't find this else where so i figured id ask it here. What is the relationship/difference between the two? To me diffraction just seems like a generalized and/or classical way to describe...
View ArticleFloating Objects Affected by the Moon
This seems like a pretty simple question, but I haven't been able to find an answer yet. It has to do with gravity, so even though it's not really about special relativity, this seems like the best...
View Articlepneumatic equation
I'm trying to find a particular equation that I came across years ago, but have since forgotten, and probably never knew the name or if it even had a name. Basically, if you have two regions with...
View ArticleRelation between electric potential energy and electric field
Please explain the relation between electric potential energy and electric field in detail.
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