Dale's latest activity
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Dale reacted to Ibix's post in the thread High School Thought Experiment: Behavior of shadow of object moving at speed c with
Like.
I think how I would phrase it is that Lorentz contraction does have an effect on the shadow length. If one were to compare a... -
Dale reacted to Ibix's post in the thread High School Thought Experiment: Behavior of shadow of object moving at speed c with Like.
You need to be a little careful here, because how the shadow appears still depends on how you're looking at it. If you look directly...
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Dale reacted to .Scott's post in the thread High School Thought Experiment: Behavior of shadow of object moving at speed c with Like.
For the general case, this is a very interesting question. But for simplicity, I will answer a much more limited case. Let's say that...
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Dale reacted to ShadowKraz's post in the thread Insights Thinking Outside The Box Versus Knowing What’s In The Box with
Skeptical.
There is a difference between the 'box' and knowledge. It is in how one treats the knowledge. If it is assumed to be completely solid... -
Dale replied to the thread Insights What Exactly is Dirac’s Delta Function? - Insight.On PF, AI output is not considered to be a valid source, and this thread is an excellent example why. What you posted is an AI...
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I like to think of a/the core pursuit in mechanical engineering as a game of "follow the energy". It's very common for your energy to...
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OK, and where is energy "destroyed" here (aside of dissipation by friction)?
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I think this is roughly the apparatus OP has in mind. The two green discs are identical and counter-rotate about the blue axle with...
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How can you even suggest such an experiment? Where would you get two identical grinders with no (or at least equal) friction at every...
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During those 10000 seconds, if energy is going into the system but the system maintains a constant mechanical energy, then that energy...
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Dale replied to the thread Undergrad Is energy really conserved?.The heat is different. If the experiment is done in an insulated chamber then the 10000 second chamber will have a higher temperature...
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I’m a retired ex physicist I guess. Although I have a first degree in theoretical physics and did post graduate studies ( structural...
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Dale reacted to PeterDonis's post in the thread Undergrad On the Quantum Mechanics of Entropic Forces with Like.
It does no such thing. GR says nothing whatever either way about black hole entropy and temperature. Temperature and entropy don't even...
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Dale replied to the thread Insights Thinking Outside The Box Versus Knowing What’s In The Box.After a severe thread cleanup, and several thread bans, this thread is reopened. Please remember that we want to keep PF productive...
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Dale replied to the thread Undergrad Is energy really conserved?.OK, so you don't seem to understand what it would take to show that energy is not conserved. To show energy non-conservation you have...