TSny's latest activity
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To illustrate @PeroK's response. Think of a rock projected at an angle from the edge of a cliff. In the absence of air resistance, it... -
In that scenario, the component of velocity in the y direction remains constant. It would not reduce to zero.
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TSny replied to the thread Irodov- 1.123- Simple conceptual question with two masses connected by a spring.Yes. For any value of ##k##, you get the same expression for the minimum force necessary to cause movement of ##m_2##. [Edit: This...
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TSny reacted to wrobel's post in the thread Irodov- 1.123- Simple conceptual question with two masses connected by a spring with
Like.
It is interesting to think about ##k\to\infty## -
TSny reacted to Greg Bernhardt's post in the thread Announcement Please welcome berkeman as PF Admin with Like.
I am thrilled and honored to announce that @berkeman has accepted a role as PF Admin! @berkeman has 20 impactful years at PF under his...
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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 Like.
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...
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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.
