Recent content by better361

So what the Lagrangian does is that it gives us an ability to create and test models for systems in a way that is easier than using Newton's law?

First, let me take as the definition of a Lagrangian the quantity that when put into the Euler Lagrange equations, it gives the correct equation of motion. It sounds like we need to know the equations of motion first. For example. the Lagrangian for a particle subject to a constant magnetic...

Thanks for the link, but I have already found websites with those videos. I was referring to videos to other subjects rather than fluid mechanics.

Does anyone know where I can find video lectures similar to in that they are from the 1950's?

How so?

Do you mean the surface that intersects the horizontal plane at the surface? So if I had a sphere where half of it is submerged, the missing part would be the great circle around the equator?

Ok, thanks! Also, can you link me to somewhere/some book that explains how to deal with discontinuities? I suspect it would just be in any regular multi book, but I just remember them saying when stuff isn't "nice", you can't apply the theorem.

@GlenMedina Essentially, I am talking about the buoyant force. @Orodruin Wait, so divergence theorem still holds even if the vector field is discontinuous in a sense? @A.T. : I guess not, but I can only put this to rest with a mathematical or very thorough physical explanation . :)

I don't think I have something that it very anti-symmetric and floats. Ohh, and correction to my second statement, "I know I know that if the object is a closed surface, and if it is completely submerged, we can apply the..."

If I placed a anti-symmetric object in water, and if it floats,is it possible for it to move left or right due to a force imbalance in calculating \int p * \vec{dA} . I know that if the object is a closed surface, we can apply the divergence theorem and because we also know how pressure...

I think ideal fluids are a subset of perfect fluids, at least according to my book.

So the textbook I am reading says that a perfect fluid cannot sustain shear stress, or that p_{yx}=2\mu \dot \epsilon_{yx} =0, where \mu is the viscosity, and \dot \epsilon_{yx} is the rate of angular deformation. Then it says when \dot \epsilon_{yx} =0, this means that "two adjacent...

Hey guys, I am currently self studying some microwave engineering through Pozar's textbook, and I have a couple of conceptual questions. 1.What is the point of defining a generalized reflection coefficient \tau(0) e^{-2j\beta l} if real reflections happen at boundaries? 2. Is there an analog to...

bump on questions from my last post.

What makes the ball start to roll if the force is applied through the center? If static friction points in the direction of motion, what is supplying a torque in the opposite direction to make the ball roll properly? How exactly is the static friction proportional to friction? If the equation...