DaveE's latest activity
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DaveE reacted to Steve4Physics's post in the thread Current through an inductor as a function of time with
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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... -
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...
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DaveE replied to the thread B Six Pencil Puzzle.It would be nice to have a more rigorous solution. Maybe some linear algebra since there are so many constraints?
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The original puzzle was for round cigarettes. I changed it to pencils but I realize some pencils are hexagons. One edge could be higher...
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DaveE replied to the thread B Six Pencil Puzzle.Somehow I knew I would end up with this. Now I'm 99.9% sure it works. Plus (bonus!) I used up some of the very many old broom...
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DaveE replied to the thread B Six Pencil Puzzle.Of course. But it means you're really close to a solution. Maybe pretend that your mathematical pencil has a diameter of pencil plus...
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DaveE replied to the thread B Six Pencil Puzzle.Yes, my first guess. But then I thought: And then: Now I'm pretty confused. My intuition says it will work as a non-planar...
