hutchphd's latest activity
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hutchphd replied to the thread Graduate Practical demo - Ferromagnetic attraction at interpole boundary.t too thnk the inclusion of remanance in the discusson is likely not fruitfuil. I do think it important, however, to remember that... -
hutchphd reacted to berkeman's post in the thread Graduate Practical demo - Ferromagnetic attraction at interpole boundary with
Like.
It looks like they are called "Spiral Shank Nails", and the grooves afford superior holding power for the nails: I don't think the... -
hutchphd reacted to berkeman's post in the thread Graduate Practical demo - Ferromagnetic attraction at interpole boundary with Like.
Correct. If the B field is constant in a region enclosing a ferrous object, there is no net magnetic force on the object. There is a...
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hutchphd reacted to Dale's post in the thread Undergrad Why is gravity a fictitious force? with Like.
We are already in that situation with GR alone. So why should we hypothesize about unknown possible future theories when we can already...
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hutchphd reacted to Dale's post in the thread Undergrad Why is gravity a fictitious force? with Like.
Kind of going back to the original question. To understand why gravity is considered a fictitious force ( I prefer the term inertial...
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hutchphd reacted to PeterDonis's post in the thread Undergrad Why is gravity a fictitious force? with Like.
He can't because, as he said, it doesn't. The logic is the other way around: if you construct a theory where gravity is a geometric...
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Hi all, I've been in the world of physics for about 4 years. I teach physics only and want to continue doing so. Teaching high school...
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hutchphd reacted to tech99's post in the thread Do old CRT and O-scopes degrade to emit harmful X Rays? with Like.
X-rays are not emitted below 20kV accelerating voltage so far as I know, so it was only when colour TV started that it became an issue...
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hutchphd replied to the thread Do old CRT and O-scopes degrade to emit harmful X Rays?.To my reading this article saye that claims of lead poisoning were made but seem very unlikely. Pleae represent claims more...
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hutchphd replied to the thread Do old CRT and O-scopes degrade to emit harmful X Rays?.Have you a reference for this? It seems unlikely to me, but data might be convincing. Also a red herring in this context.
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hutchphd replied to the thread Undergrad Expanding loop torque division.Please read. I said torques not well defined. torques need to reference an axis.
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hutchphd replied to the thread Undergrad Expanding loop torque division."Torque on each leg" is not well well defined. I think you are confused......if these wires are rigid, force on each will resist the...
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hutchphd reacted to berkeman's post in the thread Cool weather experience - echos off clouds with Like.
It could be that an inversion layer formed at the same time (I don't know if inversions create clouds or vise-versa of if they are even...
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The arrow in the diagram just indicates the positive direction for a force component (sign convention), not the actual force direction...
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I don't think it is the size of the ant that matters. Here in Tasmania, we have those nervous little jack jumper ants. Their venom...
