TSny's latest activity
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TSny reacted to kuruman's post in the thread B Why is displacement the integral of acceleration with respect to time? [corrected in thread] with
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A simple way to look at this is to consider the displacement as the "area under the velocity vs. time curve" which is really the... -
https://en.wikipedia.org/wiki/Yvonne_Choquet-Bruhat (photo from 1974) https://www.nature.com/articles/d41586-025-01763-z...
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TSny replied to the thread A Error in Landau-Lifshitz Vol 2, equation (2), page 277.In the 4th edition (1975), the relevant page is 257, not 277. I believe I was able to derive the equation for ##D_{\alpha}## in (2) by...
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TSny replied to the thread I I would like some assistance working with commutators.Your method is fine. To shortcut it, you can note that all factors in ##[y p_z, x p_z]## commute among themselves. Thus, ##x##...
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TSny replied to the thread A hanging ring carrying current in a uniform magnetic field.👍 If the string is not vertical, then the string will exert a force on the ring that has a nonzero horizontal component. But there are...
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TSny replied to the thread Can a dipole be modeled as a point charge?.Yes. From post #8, @Electrodude realizes that the "point charge model" won't work for the original problem, but the model should work...
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TSny replied to the thread Can a dipole be modeled as a point charge?.Suppose you want to find the force on a dipole ##p## produced by a linear charge distribution with uniform linear charge density...
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TSny replied to the thread Can a dipole be modeled as a point charge?.A dipole has zero net charge. So, modeling the dipole as a system with a variable net charge (2q/r) (2p/r) [edited] is not going to...
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TSny reacted to kekpillangok's post in the thread Block drifts off between two moving planes through friction with Like.
Can we explain this from the fact that, at each instant, there are acceleration vectors of equal magnitude along the directions of the...
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TSny replied to the thread Block drifts off between two moving planes through friction.Yes. At each instant of time, the speeds W1 and W2 are decreasing at the same rate. Thus, the overall changes ΔW1 and ΔW2 are equal.
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TSny replied to the thread Block drifts off between two moving planes through friction.Yes. I think that's it! :smile: The two friction forces are represented by f. ##\vec W_1## is the velocity of the block relative to...
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TSny replied to the thread Block drifts off between two moving planes through friction.This formula definitely works. I've tested it with several arbitrary choices of u1 and u2. I noticed from the numerical solution that...
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TSny replied to the thread Block drifts off between two moving planes through friction.Your divination works! You took ux < uy, but that's ok. [Edited]
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TSny replied to the thread Block drifts off between two moving planes through friction.Mass is playing the role of inertia here, rather than associated with gravity.
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TSny replied to the thread Block drifts off between two moving planes through friction.I still don't see an analytic solution. The only relation for the final velocity components that I have found is ##\large...
