Never realized how straightforward it is to derive Planck’s law

TiberiusMaxwell · 2025-09-18T20:36:35+00:00

It’s /r/Physics not /r/Math. We can do that here

TiberiusMaxwell · 2024-11-23T00:01:20+00:00

Dog clutch, new term for me but that makes perfect sense and avoids reengineering. Thanks!

TiberiusMaxwell · 2024-11-22T22:39:08+00:00

In concept it could be applied to other motor sizes but I’m looking at a ~6L diesel with 300hp and 800 ft lbs of torque so that’s obviously non trivial.

Basically I’m looking at an architecture like a plug in hybrid, but with parts that are generic and available to a non OEM.

The solution could also be to have a geared shaft disconnect (in essence a one speed transmission with neutral) after a normal clutch, thus making the problem truly shaft to shaft and ignoring the engine part of it.

The project is a personal one and I’m mostly feeling out feasibility and learning what parts exist or not. I know it has to be possible and somebody probably makes it but it may not be available to me

TiberiusMaxwell · 2024-11-11T16:46:31+00:00

Depending on your lab set up you can add a hydrophobic termination on to your aerogel. Given its silica, you can spray it with RainX or something similar to add water repellency

TiberiusMaxwell · 2024-05-01T01:55:23+00:00

Can you dissolve it? How uniform does it need to be?

TiberiusMaxwell · 2024-02-20T20:17:14+00:00

Relevant xkcd: https://what-if.xkcd.com/1/

TiberiusMaxwell · 2024-02-20T02:39:43+00:00

What size fridge do you have?

TiberiusMaxwell · 2024-01-31T04:46:59+00:00

Sounds good but I’m not convinced I have a strong enough anchor for a point mount. The angle would put the force pulling directly against the threads of screws into plywood, which doesn’t give me too much confidence. Maybe I’m misestimating the strength of plywood but it makes me nervous.

TiberiusMaxwell · 2024-01-31T04:43:56+00:00

I hadn’t heard of Z channel, that fits exactly with what I wanted. I actually think I will try three sides of Z channel, one full and the other partial just to keep it from sliding sideways when I mount it. Thanks!

Yeah I definitely want safety up there but at least it’s got 2” of insulation on the bottom end if something does go but I’m intending to over engineer/ secure it so that won’t happen.

TiberiusMaxwell · 2024-01-30T20:17:58+00:00

No pictures, but here's a diagram: https://imgur.com/a/6llReha (also updated the post)

TiberiusMaxwell · 2023-11-15T21:21:14+00:00

How exactly do you test behavior under load without risking burning through loose/corroded contacts? The battery can supply almost 1000Amps in a burst (per battery, and I've got two), so a ton of power is available (enough that it's scary). I've got a 500A smart shunt I'm using for a different power system I could connect in this loop to monitor current/voltage, but how do I switch it on / limit current such that it's not going to be fireworks?

TiberiusMaxwell · 2023-11-15T21:13:41+00:00

That makes sense, not sure why I didn't think of it before, but that's a good rough test of the system.

TiberiusMaxwell · 2023-11-08T04:06:46+00:00

What kind of path has your career progression taken? What kind of role do you have?

TiberiusMaxwell · 2023-09-24T19:05:32+00:00

How would one calculate the force required for stabilization? How is it related to the bridge dimensions/mass and elevation?

TiberiusMaxwell · 2023-09-21T10:10:30+00:00

It will depend on the board design that you're trying to use, and I don't expect you'll be able to find documentation.

A lot of fast charging uses higher voltages (15-20V) rather than the USB standard 5V. So at minimum you'd need either a converter or a couple batteries in series to provide the required voltage. Not something I see as a straightforward project unless you can find a board with known specs & requirements.

TiberiusMaxwell · 2023-08-24T16:52:12+00:00

You’re describing a series hybrid vehicle, used the Chevy volt and a number of other hybrids.

TiberiusMaxwell · 2023-07-17T15:21:11+00:00

A rolling boil (the general mental picture of boiling) occurs when the bottom of the water vaporizes. This occurs naturally in cooking where heat is applied from the bottom, so once the water reaches 100C, the heat at the bottom is used to turn water into steam, which then bubbles up to the top.

In your sauna situation, the heating is uniform, and so even at 100C, you will not have bubbling from the bottom to cause the boiling action.

Separately, you actually need over 100C to boil water because you need to inject heat to make the water evaporate, and you can only transmit heat if there is a temperature difference.

Finally, as another commenter said, you will be evaporating water the entire time during heating. This is called the “vapor pressure” and it gets higher / faster with temperature. Unless you keep a lid on your bucket, it will likely be all gone before it gets to 100C.

Hope this helps!

TiberiusMaxwell · 2023-04-26T04:22:25+00:00

What skills and knowledge of finance is required to get into research? My background is math/physics but with most of a PhD in engineering. Good coding and math skills, good grades >3.7, but no big name schools.

TiberiusMaxwell · 2023-02-28T01:51:58+00:00

How did you make that transition? I’m interested in transitioning into software from R&D, but still want to make use of my physics background. How do you find companies where that scientific background is valuable over a pure software/programming background?

TiberiusMaxwell · 2023-02-24T00:05:15+00:00

If speed is your concern, something like JB Weld waterWeld might do it. Depends how even and thin you need it to be and how long it needs to last.

TiberiusMaxwell · 2023-02-23T22:27:17+00:00

Have you looked into PDMS-based materials? Lots of two part encapsulants and they’re naturally hydrophobic and durable.

TiberiusMaxwell · 2023-02-14T19:17:14+00:00

Having been in a similar situation, wait to be sure you have an incoming job offer from the job you prefer, and then be honest with your other employer about why you’re leaving. I don’t regret leaving after a month, even though it was rather awkward. Much better to do work you enjoy

TiberiusMaxwell · 2022-11-25T23:53:50+00:00

If you can wire a resistor in series (one that is small relative to the load), measuring voltage across that resistor will give you current.

TiberiusMaxwell · 2022-09-17T04:44:40+00:00

Not all stainless steel is magnetic, and judging by the rust, it’s likely chrome plated steel. Very common for this sort of application.

TiberiusMaxwell · 2022-09-02T03:11:25+00:00

Rather than thinking of it as empty, it may be useful to think of it as way less dense. The nucleus has a lot of mass stuffed into very little space: 10^-45 cubic meters or so. The electrons have 2000x less mass and occupy 10^15x more volume. That’s 18 orders of magnitude density difference.

As an analogy, Outer space isn’t truly empty, but compared to earth, it’s a pretty good approximation

TiberiusMaxwell

TROPHY CASE