SiennaTheGr8's latest activity
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SSiennaTheGr8 replied to the thread High School Need tips to understand Relativistic Energy in Special Relativity.You can also derive ##d \gamma = \gamma^3 (\vec \beta \cdot d \vec \beta)## fairly easily and use that to do a change of variables...
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SSiennaTheGr8 reacted to Ibix's post in the thread High School Need tips to understand Relativistic Energy in Special Relativity with
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I think this is the integral you are attempting to compute. If so, I'd do it by inspection. For any integrand with a ##1/f^n(x)## it's... -
SSiennaTheGr8 reacted to Ibix's post in the thread High School Traveling through space at zero km/s with Like.
This is correct, and you will find it in physics textbooks too. This, however, is impossible. If you attempt to construct a frame of...
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SSiennaTheGr8 reacted to PeroK's post in the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime with Like.
I'm one of the few students, it seems, that finds spacetime diagrams confusing. The problem is that the diagram you have drawn is in...
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SSiennaTheGr8 reacted to FactChecker's post in the thread Undergrad Is this another "paradox" or a veritasium mistake? with Like.
IMO, Veritasium tries hard to be correct. It might be nice to leave a comment on the video about the mistake. UPDATE: I see that the...
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SSiennaTheGr8 replied to the thread Undergrad Question about special relativity and magnetism.I think it's worth mentioning that this statement isn't true. The "electricity + length-contraction = magnetism" concept works for some...
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SSiennaTheGr8 reacted to Ibix's post in the thread Undergrad Question about special relativity and magnetism with Like.
No, they assume that the net charge is zero in the lab frame. So the spacing between electrons must be equal to the spacing between...
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SSiennaTheGr8 replied to the thread Graduate Jackson: justification of the Poynting vector by GR.Yes, I suppose all I've shown (if my math was right) is that the addition of a "4-curl" term to the electromagnetic stress-energy tensor...
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SSiennaTheGr8 replied to the thread Graduate Jackson: justification of the Poynting vector by GR.Thinking about this a little more... For the laws of physics to be expressed covariantly, we'd have to add not just a curl-term to the...
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SSiennaTheGr8 replied to the thread Graduate Jackson: justification of the Poynting vector by GR.I briefly looked at some GR books for an explanation but didn't find anything. I had better luck with graduate-level E&M books; in...