Dale's latest activity
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Dale reacted to Martyn Arthur's post in the thread I Varying resistance readings depending on how I connect my meter with
Like.
Ok I can live with that; thanks or your help; I will try it with a clean pcb. Thanks Martyn -
Dale replied to the thread I Varying resistance readings depending on how I connect my meter.If the multimeter is accurate then it is accurately telling you that the breadboard is adding resistance. There really isn't anything to...
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Dale replied to the thread I Varying resistance readings depending on how I connect my meter.Well, either your multimeter is not good and is not reading the actual resistances, or your breadboard is adding some resistance. I...
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Dale replied to the thread I Varying resistance readings depending on how I connect my meter.The breadboard seems to add 0.4 ohms of resistance.
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So, my equation with the deltas was correct. The mistake happened when I switched from ##\Delta## to ##d##. That is something new. In...
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Dale replied to the thread I The rocket equation, one more time.Sure, that is part of “solve the equations consistent with your conventions”. I was just making a general statement. There is nothing...
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You have no choice with the derivative: it's positive when a quantity is increasing. You have chosen the opposite convention for...
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Dale replied to the thread I The rocket equation, one more time.When you write something then it is up to you to be clear in all of your sign conventions and the meaning of each variable. If you do...
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As an example, imagine we have a financial spreadsheet. Let's say column A is the starting balance, column B is a deposit and column C...
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Dale reacted to PAllen's post in the thread I Is using r as a coordinate in Birkhoff's theorem a limitation? with Like.
I don't know if I can track it down from a long ago posts of mine, but I discussed a paper by a mathematician specializing GR that...
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Dale reacted to PeterDonis's post in the thread I Is using r as a coordinate in Birkhoff's theorem a limitation? with Like.
Not a vacuum spacetime, of course. But you might be able to by patching together regions with appropriate stress-energy tensors. I think...
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Dale replied to the thread I Is using r as a coordinate in Birkhoff's theorem a limitation?.Oh, yes, that is true. I wonder if you could construct an oscillating spacetime like the OP described. I can’t imagine the boundary...
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Dale reacted to PeterDonis's post in the thread I Is using r as a coordinate in Birkhoff's theorem a limitation? with Like.
Yes, it does! That was my point in post #15. Maximally extended Schwarzschild spacetime, which is a solution that meets the requirements...
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Dale replied to the thread I The rocket equation, one more time.You can choose whichever convention you like. You just have to be careful to be clear about the convention you use and be careful to...
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Dale reacted to SiennaTheGr8's post in the thread I Question about special relativity and magnetism with Like.
I think it's worth mentioning that this statement isn't true. The "electricity + length-contraction = magnetism" concept works for some...
