SammyS's latest activity
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SammyS reacted to AlexB23's post in the thread Announcement PF Member Awards 2025 Coming Soon! with
Like.
Looking forward to the results. It would be cool if there was an award for the member who uses multiquote the most. It is cool when... -
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Google's AI sure chose a strange image for it's explanation of Colonoscopy...
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SammyS reacted to DaveC426913's post in the thread Undergrad Please Explain (actually explain) The Monty Hall Problem with
Haha.
Y'know, we have all been making some pretty bold assumptions about the range of possible outcomes... -
SammyS reacted to Dale's post in the thread Insights What Exactly is Dirac’s Delta Function? - Insight with Like.
You really didn’t clarify the notation. The fact that the notation is Dirac’s and is not used anymore is a bit of history, not a...
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SammyS reacted to renormalize's post in the thread Undergrad Does a Point Charge in Classical Electromagnetism Possess Self Energy? with Like.
What Jackson says there regarding discrete charge distributions is (my emphasis added): So the self-energy terms are there in principle...
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SammyS reacted to haruspex's post in the thread Is it possible for a vertical rod balancing on a table to lose contact by striking the top of the rod? with
Agree.
It is stated as frictionless, but it makes no difference anyway. -
SammyS reacted to mmfiizik's post in the thread Two-layer dielectric, four-capacitor model vs three-capacitor model with Like.
Thank you all for explanations. I tried to prove this to myself by contradiction, but it might be an oversimplification. If we assume...
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SammyS reacted to Steve4Physics's post in the thread Two-layer dielectric, four-capacitor model vs three-capacitor model with Like.
I don’t think that’s correct – there will be discontinuities in charge-densities and field-strengths as you move left to right. To add...
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SammyS reacted to Dale's post in the thread Undergrad Varying resistance readings depending on how I connect my meter with Agree.
The breadboard seems to add 0.4 ohms of resistance.
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SammyS reacted to PeroK's post in the thread Undergrad There are only finitely many primes with Like.
There are two slightly different versions of the Euclid proof. If we assume that we have all the finitely many prime numbers, then the...
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I'd forgotten this puzzled me in the past: whether there is a magnetic field from a current must depend on the frame of reference...
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SammyS reacted to Dale's post in the thread Undergrad Ampere-Maxwell law seems to contradict causality? with Like.
No. It just means that your assumption is wrong. Look, your assumption is basically that something happened which is so fast that...
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The question was for the OP.
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Yes, my basic remark was that squaring isn't an equivalence operation, i.e., it cannot be uniquely reversed. One has to keep this in...