hutchphd's latest activity
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hutchphd reacted to DaveE's post in the thread Undergrad What's the trick to this "perpetual" marble device? with
Like.
But it could be an electromagnet that attracts the ball along the lower horizontal path. OK, I know it isn't. But if you allowed me a... -
hutchphd reacted to Baluncore's post in the thread Torque to turn a large Beam on a Rotisserie with Like.
@Nick09 You set the working height by pushing a pin through one hole in the black box, that passes through one of many holes, (spaced...
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Comments. Drilling those diagonal nozzle holes will be difficult and expensive. The differences in machining and metallurgy, between a...
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In Jomtien
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If ##g## is small but nonzero, then so is ##p=\rho g h##.
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hutchphd reacted to jack action's post in the thread Expansion or compression -- which is more energy efficient? with Like.
That is also an isobaric compression, requiring more work. Do you mean like an isothermal expansion? Where both work is released and...
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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...
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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...
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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...