Dale's latest activity
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Dale reacted to PeroK's post in the thread Undergrad What empirical observation supports the axiom of continuous spacetime? with
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Ontology is philosophy, not physics. No it's not. Everyone knows GR can't be the whole story. There's an explicit singularity in the... -
Dale reacted to PeroK's post in the thread Undergrad What empirical observation supports the axiom of continuous spacetime? with Like.
It isn't. No one has found a way to make a discrete theory work. The continuum is simpler mathematically and thereby the default...
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Dale replied to the thread Undergrad What empirical observation supports the axiom of continuous spacetime?.No, this is not true. Some do, but not all. On the contrary, every observation which is correctly predicted by a theory which uses...
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Dale replied to the thread Undergrad Magnetic Resonance physics question: RF pulse role and 'in-phase'.My primary MRI physics reference is this one...
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Dale replied to the thread Undergrad What physical quantity has dimension [ML⁻³T⁻²] in electromagnetism?.It is pretty clear that you do not. You like your SI-based framework and think that it is more than it is. It really isn’t. ##E/B=c## is...
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Dale replied to the thread Undergrad What physical quantity has dimension [ML⁻³T⁻²] in electromagnetism?.Yes. Dimensional analysis depends on the dimensions and the dimensions depend on the unit system. Dimensional analysis is clearly and...
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Dale replied to the thread Undergrad What physical quantity has dimension [ML⁻³T⁻²] in electromagnetism?.This is nonsense. The quantities don’t even exist outside of a system of units. They cannot be organized outside of the system of units...
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Dale replied to the thread Undergrad What physical quantity has dimension [ML⁻³T⁻²] in electromagnetism?.I don’t see this approach as being useful. The dimensionality of the various quantities is a matter of convention. You can choose...
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Dale replied to the thread Undergrad What physical quantity has dimension [ML⁻³T⁻²] in electromagnetism?.The symmetry between the electric and magnetic fields is already made explicit and concrete in the standard covariant formulation of...
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Dale replied to the thread Undergrad What physical quantity has dimension [ML⁻³T⁻²] in electromagnetism?.That is precisely what you did. You literally took a quantity, squared it and multiplied or divided by a factor of ##\mu_0## or...
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Dale replied to the thread Undergrad What physical quantity has dimension [ML⁻³T⁻²] in electromagnetism?.If I take literally any quantity and square it, then multiply by some integer power of ##\epsilon_0## or ##\mu_0## then I get a...
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Dale reacted to SiennaTheGr8's post in the thread High School Lorentz Transformation of Electric & Magnetic Fields Visualized with Like.
I've made some more improvements to this app, including: Made the two-column desktop layout more convenient: the visualization remains...
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Dale replied to the thread Undergrad Does the Alcubierre drive shorten distances?.The speed of expansion of the length of an elastic band certainly does. You could measure the stress or the strain in the band.
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Dale replied to the thread Undergrad Does the Alcubierre drive shorten distances?.The best rule of thumb is to think of an experiment whose actual measured outcome depends on the thing in question.
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Dale replied to the thread Undergrad Does the Alcubierre drive shorten distances?.I don’t think you can claim this as “the distance”. It is a quantity that you have defined which has units of distance. But I have never...