Dale's latest activity
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Dale replied to the thread High School Deriving the "third" kinematic equation using graphs.Obviously, you should use a graph of ##v^2## vs ##x##. That will give you the point-slope form of a straight line ##(y-y_0)=m(x-x_0)##... -
Dale reacted to kuruman's post in the thread High School Deriving the "third" kinematic equation using graphs with
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As @Ibix remarked, some algebra is inevitable when you translate a graphic form into an algebraic form. Here is the simplest way I can... -
Dale replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.And my answer to that question remains the same. It can be either depending on the choice of the author. Of course! It would not be...
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Dale replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.I don’t think further clarification is needed. I understand your question. I have answered your question multiple times! You seem to...
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Dale reacted to PeterDonis's post in the thread Graduate How valid is the indivisible interpretation of quantum mechanics? with Like.
Where? Please give a specific reference. "The indivisible interpretation" is not any recognized interpretation that I've heard of.
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Dale replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.This is incorrect. Not all Lagrangians have a conserved energy. That is kind of the point of Noether's theorem, the reason that she...
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Dale replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.Again, there is no single answer. Any author can choose whether they take it as an assumed principle or a theorem proven from other...
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Dale replied to the thread Undergrad Net magnetic force in discontinuous circuits?.As you prepare your post, be aware that this is well established science. EM drive devices are not discussed on PF beyond the already...
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Dale replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.Right. But because different authors make different choices, there is no one single answer to the question.
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Dale replied to the thread Undergrad Net magnetic force in discontinuous circuits?.You are neglecting the E field and the ##\rho## and ##\dot \rho## terms of Jefimenko's equations. Including those two terms was the...
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Dale replied to the thread Undergrad Net magnetic force in discontinuous circuits?.The Biot Savart law doesn’t apply to the modified circuit. The Biot Savart law is only valid for magnetostatic situations. You would...
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Dale replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.What is assumed and what is derived is something that individual authors can decide according to their own personal preferences.
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Because it fails as often as it succeeds. Don't get me wrong; I use it too. But it can't be trusted.
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Dale replied to the thread High School Do Dark Energy and the Casimir effect indicate Exotic Matter could exist?.What is your current level of physics knowledge?
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Dale reacted to Nugatory's post in the thread Undergrad What empirical observation supports the axiom of continuous spacetime? with Like.
The claim that quantum mechanics requires any ontology is a philosophical claim, not a physical one. All the physics is in the...