Recent content by DaveE

https://www.coherent.com/materials/rare-metals/thermoelectrics

The direction of maximum slope (minimum? IDK). Arg(-grad(h))=0 where h is the height of the ground. If you're a nerd. Downhill. If you're a skier.

Does the slope really matter? What if the sheep is moving perpendicular to the fall line when they get to the fence?

OK. We don't know. Neither do you. That's how it goes with experiments that aren't scrupulously controlled. The fact that they all failed immediately makes me think you did something to them to greatly depleted their lifetime. As a side note (I'll spare y'all the full diatribe), lightbulbs...

The only energy an incandescent bulb can store is the thermal energy of the hot filament. This energy will dissipate quickly and isn't really accessible in practice. I think your issue relates to damage done to the bulbs, which could have occurred in a few different ways. The lifetime of...

Yes. Plus you can't program human fallibility and irrationality in advance. Driving with humans is a very human experience. Merging onto a busy freeway when you aren't guaranteed a space? We do that all the time; I know you'll let me in, you'll have to. How do you program that months in...

Physicists already know that GR doesn't work with Quantum Mechanics. It isn't 100% correct. Many are trying to figure this out. So, it's not really about if you are questioning GR, it's about how you are questioning it. If your doubts about theories aren't up to speed with current knowledge...

Like 5% perhaps?

I have a DIY project question. Background: I was caulking a tile to tub gap in my bathroom remodel with a silicon based caulk (Mapei Mapesil T Plus). Caulk was applied then sprayed with a dilute dish soap and water mix for tooling. But I had some cosmetic issues so I wiped out about half of the...

I just recalled this snippet from him this morning, which I think is firmly within the PF zeitgeist. https://www.physicsforums.com/threads/how-can-i-get-admitted-into-caltech.1060447/post-7063788

Because you added a series resistance R2. Yes, I know you know that, but others may need to have it explicitly stated. This is a different network. If he didn't have R2, then it's BS. He probably ignored the initial conditions, which are pretty important for a transient response problem...

It's what's written in your local building code book(s). Sometimes it's not simple or obvious, that's why the books are big. Sorry, I don't want to read them to you, you'll just ask us more questions without actually studying the subject. I think I'm done.

This!!! RCD/GFCI should not be used as primary protection. They are an additional safety feature which simply isn't as reliable as good construction. Other code requirements are still necessary.

Also, note that isolation transformers aren't just your run of mill transformer. They will (should) have appropriate construction with either lots of spacing and insulation or grounded screens to prevent stray currents from causing excessive secondary voltage wrt earth. Some of the reasons we...

It works better if you search for knowledge, not just answers. But kudos for recognizing that you must verify the information you find on the web. Answers are more appropriate for specific, detailed, questions. General subject matter questions, like what is grounding for, how does gravity work...