DaveE's latest activity
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DaveE reacted to DaveC426913's post in the thread Wood/Glass/Metal DIY lifting concrete blocks with a lever and a grabber with
Like.
I went with the stake-and-shim. The shim is steel, with a 90 degree bend, so I can pound it in with the fulcrum hammer. It does... -
DaveE reacted to sophiecentaur's post in the thread I Is This....Right? Splitting LED colors is not working for me with Like.
You are right but I know what I mean when I talk about a bright spot of light or a dim spot of light. I was too colloquial, perhaps...
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DaveE replied to the thread Electrical Can DIY Solar Panels Match Commercial Quality?.Probably not, although I suppose it depends on what's in your workshop. Give some credit here to all of the manufacturing engineers...
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DaveE replied to the thread I Is This....Right? Splitting LED colors is not working for me.The thing about a physics website is if you say brightness, we are likely to assume you are talking about brightness*. This isn't so...
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DaveE reacted to DaveC426913's post in the thread Is this an oversimplification? (treating a lens as a set of prisms) with Like.
Sure. It's a simplification. Three is less than infinity. Is it an oversimplification? Only if it is too simple to teach the desired...
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DaveE reacted to Steve4Physics's post in the thread Current through an inductor as a function of time with Like.
Hi @palaphys. IMO your overall method/logic looks ok – but you have made a mistake. It looks like you are trying to apply a method...
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DaveE replied to the thread Current through an inductor as a function of time.The current through the battery isn't the same as the inductor current, there are other paths too.
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Be more specific. Which method, to do what? Summing vectors involves summing the x and y coordinates independently. That is done as if...
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DaveE replied to the thread Beauty of old electrical and measuring things, etc..Perhaps the most risqué HP ad. Circa 1972. I recall this from a poster in the hallway of the Caltech EE building when I was an...
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DaveE replied to the thread Wood/Glass/Metal DIY lifting concrete blocks with a lever and a grabber.Yes, the first block or two will be an experiment, a learning experience. :wink:
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DaveE replied to the thread Wood/Glass/Metal DIY lifting concrete blocks with a lever and a grabber.I would vote for something you make with a couple of 2x4 scraps, a drill, and a saw. If this is your profession, you need good tools. If...
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DaveE replied to the thread B Six Pencil Puzzle.Which plane? No two sticks are coplanar, everything's twisted a bit. Anyway, the gap is easy to see in person, particularly because you...
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DaveE replied to the thread B Six Pencil Puzzle.And... Version 2. Now I'm 99.9% sure it doesn't work. Although it's hard to show in a photo. The cable ties are a nice easy solution...
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Here are 2 solutions with 7 infinite cylinders. https://www.sciencedirect.com/science/article/pii/S0925772114000819 Major computation...
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DaveE replied to the thread B Six Pencil Puzzle."The case of parallel cylinders (lines) is excluded from our analysis. It is left to the reader to show that if two cylinders are...
