TSny's latest activity
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TSny reacted to haruspex's post in the thread Block drifts off between two moving planes through friction with
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Your result is probably more accurate. I modelled it in a spreadsheet with fairly coarse timesteps. -
TSny replied to the thread Block drifts off between two moving planes through friction.I tried setting up the equations of motion and used Mathematica to solve them numerically. I get similar results to @haruspex 's post...
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TSny replied to the thread Block drifts off between two moving planes through friction.I think the behavior is to be expected. Just after release, the block will pick up a small velocity in the 45-degree direction as shown...
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TSny replied to the thread A hanging ring carrying current in a uniform magnetic field.I believe the figure given in the problem statement is incorrect. It should be as shown on the right. [Edit: Specifically, the string...
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TSny reacted to kuruman's post in the thread Variable Mass system : Sand falling into a Freight car with Like.
I grappled with this point when I was putting together the article mentioned in post #2. Eventually I decided to reserve the word...
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TSny reacted to Su6had1p's post in the thread Variable Mass system : Sand falling into a Freight car with Like.
@TSny @kuruman thanks for your help.
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TSny reacted to kuruman's post in the thread Variable Mass system : Sand falling into a Freight car with Like.
You may wish to read this article that discusses how to approach variable mass problems and the pitfalls to watch for. There is a...
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TSny replied to the thread Variable Mass system : Sand falling into a Freight car.I think you are ok up through the following line: But your result for ##C## is not correct: Check your work. Your method is fine...
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TSny replied to the thread A Question about Weinberg's GR book.Tλλ The objective is to determine the free-fall equations of motion to order ##\frac {\overline{v}^4}{\overline r}.## This requires...
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TSny replied to the thread A Question about Weinberg's GR book.The reason that ##^4_{R_{i j}}## is not included in the list (9.1.26) through (9.1.29) is because this list is meant to include only the...
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TSny reacted to hmparticle9's post in the thread The flux through a cylinder from a charge at the origin with Like.
From looking at a diagram, the only component we need to worry about is the component of the flux in the ##z##-direction. The other...
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TSny reacted to robphy's post in the thread I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics with Like.
The use of the colon in the originally-given url is odd: https://repository.lib.fsu.edu/islandora/object/fsu:195 Try...
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TSny replied to the thread I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics.I think these are the notes. They look sketchy, but there are a few diagrams.
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TSny reacted to Steve4Physics's post in the thread Equilibrium Position of a Hanging Candy Cane with Like.
FWIW here's a (quite short) solution using the 2D rotation matrix – or rather just its first row for transforming the x-coordinate...
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TSny reacted to kuruman's post in the thread Equilibrium Position of a Hanging Candy Cane with Like.
For the record, here is my solution. In the figure on the right the two black dots represent the centers of mass of the semicircle (top)...
