Dale's latest activity
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Dale reacted to weirdoguy's post in the thread High School Is there anything in the Universe that is not fundamentally made up of matter? with
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Oh please, stop this nonsense. Even in ordinary language there are tons of words that have multiple meanings, depending on the context... -
Dale reacted to weirdoguy's post in the thread High School Is there anything in the Universe that is not fundamentally made up of matter? with
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@Amazed, could please stop telling me, and other physicists, how to do, understand and think about physics? You don't go to surgeons and... -
Dale reacted to DaveC426913's post in the thread High School Is there anything in the Universe that is not fundamentally made up of matter? with
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While not definitive, one might make a good start by grouping all things into either fermions or bosons. Fermions obey the Pauli... -
Dale replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.To move things along, I will answer and proceed. Specifying a boundary value selects one solution out of a family of solutions. Why... -
Dale reacted to PeroK's post in the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane with
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This is why in the development of the Riemann integral, you need an sequence of upper bounds and a sequence of lower bounds that... -
Dale reacted to stevendaryl's post in the thread Insights PF's policy on Lorentz Ether Theory and Block Universe - Comments with
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Well, I made the point earlier (although it didn't receive any replies--sniff) that even when two interpretations/models are exactly... -
Dale reacted to PeroK's post in the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane with
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The idea is that you have a right triangle with two unit sides. Shape n has n equal horizontal steps and n equal vertical steps instead... -
Dale reacted to Rick16's post in the thread Undergrad Potential energy of a system of particles with
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Here is the solution: The kinetic and potential energies of the system are $$U_k=2\cdot\frac{1}{2}mv^2=mv^2,~~~U_p=-\frac{Gm^2}{2r}.$$... -
Dale replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.What do you think specifying a boundary value does? -
Dale replied to the thread Graduate Does a truly static "Block Universe" allign with "experience" aspect?.There is nothing about your experience that is incompatible with the block universe. See the following thread... -
Dale replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.What do you think specifying a boundary value does? -
Dale replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.No, they aren't correct with respect to the vertical component. To see this, consider the spot exactly in the center of a charged... -
Dale replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.It actually isn’t different if you are close to the center of one of the plates. And it is a good example to show that the “vertical”... -
Dale replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.IMO already having 3 is confusing and fragmented. Besides, we have already discussed this: a plate capacitor close to the center of the... -
Dale reacted to A.T.'s post in the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane with
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I think it similar to the proof that pi=4 in the video below at 1:39. The explanation at 15:09 points out the fallacy @PeroK mentions above.