berkeman's latest activity
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berkeman reacted to ohwilleke's post in the thread What did you do with your old college textbooks? with
Like.
Three plus decades later, I still have almost all of them (and even consult them now and then), over the objections of other members of... -
berkeman reacted to DaveE's post in the thread Need advice and hints for working with helium with
Informative.
Could you use the valves temporarily to seal the vessel long enough to remove the plumbing and replace it with a mechanical seal, like a... -
berkeman replied to the thread Random Photos.I've used intercom systems between streetbikes and even between me and my passenger on a streetbike (full face helmets with lots of wind...
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Thank you jr!! That is greatly appreciated. No sir, I don't know the lead is ruined but I'll have to cut the furnace apart to salvage...
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berkeman replied to the thread Undergrad Why is SI taught in US university physics courses instead of cgs?.Can you give a couple examples where using cgs units helped you in your understanding of Physics versus using SI units? Thanks.
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Welcome to PF. The surface color could be a lead / antimony / tin oxide. Are you sure that the lead is ruined? Did a measurable...
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berkeman replied to the thread New member seeking expert advice in particle physics.Welcome to PF. Please keep in mind that we do not allow discussion of personal theories or speculation. All discussions must be based...
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berkeman reacted to .Scott's post in the thread Need advice and hints for working with helium with Informative.
Especially in contrast to Hydrogen, Helium is very inert - it is the most inert element. It's two electrons exactly fill the 1s2 shell...
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berkeman reacted to SootySnow's post in the thread Admissions Graduating a year early anxieties + grad school with Like.
Well said. For a long time, I've had this perception of success that's defined in magnitude rather than direction. Going into college...
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Hi I'm Connor, and I've been really interested in science when I was a kid and when I needed some evidence for a project at my college...
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berkeman reacted to Baluncore's post in the thread Simple transmitter-receiver device like Smarttag with Like.
Ask the teacher/supervisor to enable a smartphone, so other children can use the same Samsung Smarttag2 system reliably.
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How about this one: in Harahan, LA. I think they re-constructed Dickory since I lived there. I remember my GPS used to say, take...
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berkeman replied to the thread How to build a CNC plotter?.What's a "t dvd drive"? And what kind of motors/encoders are you getting? Stepper motors with end-stop detection, or servo motors?
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berkeman replied to the thread Undergrad Why is thermal energy treated differently than other kinds of energy?.(Thread discussion level changed from Graduate to Undergraduate, based on the OP's background.)
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berkeman replied to the thread How to build a CNC plotter?.So for an x-y plotter, you have two main ways to move the pen. The first uses a moving x-arm and a way to move the pen along that arm...
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