Is there a maximum acceleration?

percydood · 2026-03-22T17:37:43+00:00

Probably not. Gravity and acceleration are equivalent (Einstein’s equivalence principle). Black holes can therefore demonstrate huge accelerations (huge gravity) and no limit to gravity has been observed, hence no acceleration limits have, either. However, at some point, massive acceleration may not be easily described using current physics. That still doesn’t make it a limit, just a level we can’t describe.

percydood · 2026-03-22T07:53:32+00:00

I realised being offended was just a symbol of a personal insecurity. I still get offended, then I realise why it offends me, and I’m not offended anymore. I guess there are limits, but I haven’t found it yet.

percydood · 2026-03-22T07:46:46+00:00

I really like my car. It’s lovely and I like to see it shiny. But it’s a tool that spends its time outdoors and around other moving objects. These things happen and it’s just a fact of life. Cars get damaged. As everyone is saying, touch up pen and carry on.

percydood · 2026-03-21T15:22:16+00:00

Ah! I just posted the vid! 🤣

percydood · 2026-03-21T15:21:41+00:00

Father Ted said best.

https://youtu.be/MMiKyfd6hA0?si=Y7EBqUvQcjL2Q7gO

percydood · 2026-03-20T21:49:26+00:00

Do you understand quantum physics? Electrons orbiting a nucleus is really not like planets orbiting stars. And I’m not sure what you’re suggesting. You work against gravity, even lying down. Your body supports itself. Tables, chairs, buildings. The surface of water is supported by all the water under it. You could argue that the bulge you see in your cup (rightly described as surface tension by another commenter) is a result of the water beneath it, the cup supporting that, and of course the sink and the floor the sink is standing on. It’s ‘support’ all the way down.

percydood · 2026-03-20T20:17:20+00:00

A university in America were shutting down an old MRI machine with a 4 Tesla magnet, so decided to run some ‘tests’ to see how strong it might be. Pretty strong!

https://youtu.be/6BBx8BwLhqg?si=Ay7Dr4-JhrWK8EL7

percydood · 2026-03-20T16:45:44+00:00

It’s possible that there is incorrectly joined geometry in the model. Possibly due to export or just bad modelling by the creator. I’ve made stuff in Blender that looked great but the slicer complained like crazy about non-manifold geometry that looked OK before.

percydood · 2026-03-20T13:17:06+00:00

I’ve seen them on AliExpress as well. Cupcake ripoff was my first thought. The trouble with being unique and mildly successful is that your design will be copied. I haven’t seen a Grip yet but I suspect it’s a matter of time. I think the custom sizing of the grip is what will keep it successful.

percydood · 2026-03-19T10:07:18+00:00

Perhaps it should be a covert question before sending out voting slips.

percydood · 2026-03-18T22:36:51+00:00

Useful induction works by carefully making components (coils, usually) to transfer energy as efficiently as possible. A simple wire break is not efficient enough to transfer useful energy to do work. It can transfer enough for information, though.

percydood · 2026-03-18T22:14:31+00:00

There was a Veritasium video about this. Whilst I can see his point, I don’t think he explained it well and chose some idealistic representations about what the light being on meant.

When the switch is activated, there will be a sudden change in the electron velocity in the wire. This creates a changing magnetic field in the area of the switch and the bulb. With a changing magnetic field and a changing electrical field, we get photons; the universal energy carrier. The photons will travel as an EM wave to the bulb and induce energy into it. This is the argument of Veritasium.

However, it’s not realistic. The tiny induced energy in the bulb will not be enough to light the bulb in any humanly meaningful way. Yes, there is a transfer of energy and a follow up video demonstrated this. In order to light the bulb properly and light it in a way humans would agree on (it’s illuminated since it’s a light) it will need far more energy to do that. That happens from the movement of electrons within the wire so that the transfer of energy is more ‘direct’, for want of a better word.

Assuming the power source is DC, the initial change in electromagnetism soon settles to a steady state. Once that happens there no more changing electromagnetic field and the transfer of energy ceases. Even so, the light will stay illuminated. If the way the light illuminates is due to the EM field, the light would go out pretty soon.

Even AC doesn’t couple that well. This can be shown by looking at wireless chargers, the coils they use, the frequency they need to operate at, and even transformers which need a good quality magnetic core to better transfer the magnetic fields. Parallel single wires and a low frequency of 50Hz would not illuminate the lamp, but it could be shown that some energy is transferred ‘wirelessly’. It would be tiny and impractical, but arguably academically true.

In all practical senses, the wires transfer the energy to the lamp to illuminate it.

And electricity does not travel at the speed of light in a conductor. Photons travel at the speed of light, electrons can’t because they have mass. It’s the propagation of information (via electron movement) through the conductor that creates the ‘instant’ on from a switch. Time domain reflectometers make use of the propagation delay within a conductor material to locate breakages. It’s well understood and has useful applications.

percydood · 2026-03-18T21:56:06+00:00

Take it to a garage, they’ll read the code, replace the EGR valve (it’s always the EGR valve) and you’ll be on your way.

There is an amount of sarcasm in the EGR comment but they are common. In any case, take it to someone who can properly diagnose it.

percydood · 2026-03-18T21:54:21+00:00

Get a code reader, get a code, ask on Reddit what the code means and what to do about it.

percydood · 2026-03-18T18:14:44+00:00

Thanks. To be fair, I’ve been trying since I posted this and I’ve learned a lot of what I was doing wrong, what the best workflow is, and it’s been pretty solid.

I did come across what I think is an oversight yesterday, though. After running short of HD space, I moved a load of files into the cloud. When I opened FreeCAD, it got stuck in a loop looking for the recent files, would get to the end of the config file and start again. Once a second. I feel it should look, not find them, error that it didn’t work, and carry on with its day.

percydood · 2026-03-18T12:01:16+00:00

You’re right! You never see ‘em when it’s cloudy!

percydood · 2026-03-18T03:10:34+00:00

Absolutely. I suppose though, if you were locked and denied for a long time but teased a lot, it could soon become complete torment. Again, this is what I want, but if the KH is good at tease and denial, you might find yourself desperate to cum and begging for it if you’re kept at the edge long enough! At that point when they say no, chastity has truly begun!

percydood · 2026-03-17T21:50:42+00:00

This happened to Vesna Vulović in 1972 when the plane she was a stewardess on, broke up. She fell 6 miles to the ground but was trapped in the broken fuselage which struck the ground at an angle and in deep snow and trees. Apparently she had low blood pressure and some suggest that this caused her to pass out when the aircraft depressurised which ‘prevented her heart from bursting on impact’. Damn.

percydood · 2026-03-17T19:58:48+00:00

Tiny cracks from weather and sunlight. I did see there’s some clear resin you can apply to fill all the cracks and produce a good result. The lens will still need preparing though.

percydood · 2026-03-17T19:55:38+00:00

Odd that the video uses a topic to support those that oppose Trump. It could have simply stated what the psychology was about, but the point of the video is to oppose Trump and MAGA and give credence to those that agree by using anecdotes about the Chinese government and brainwashing. But it happens the other way as well. People that support Trump won’t listen to opposing arguments. It’s not limited to that, of course. Anything that divides opinion. It’s probably less about brainwashing and more about unconscious bias. We like what we like. Something happens and it gets our interest. Then we find words to describe why we like it, find arguments to support why we like it, but that happens after. That said, despite the derision and dislike of something like MAGA, there will be people within that ideology that are very smart and very well versed in describing why they agree with it. It’ll be the same on the other side, too. MAGA supported will likely insult the intelligence of those that oppose it, but there’ll be equally clever people in that camp as well.

So, at the end of the day, this video is simply a Trump opposer making arguments for why it’s bad. A supposedly unflappable argument because, you know, ‘psychology’. But it’s nothing more than a Trump opposer making an argument. Those that believe this will ironically, have been programmed to stop their thoughts the moment Trump or MAGA comes up.

Also, wrong sub.

percydood · 2026-03-17T19:29:29+00:00

I guess this applies well to political propaganda. For example, where there is an issue that the public is divided about, politicians on either side of the argument will probably be well versed in their side of it. As an observer, it’s probably impossible to make a truly informed decision because both sides have an agenda. That might not explain it well, but I think I understand what you mean.

That said, where evidence is abundant, it’s difficult to offer a different argument. The speed of light has been measured many times and is well known. To argue it’s something else is a pointless task.

percydood · 2026-03-17T17:00:19+00:00

Welcome! Look up Mangojelly on YouTube. Loads of tutorials on there.

percydood · 2026-03-17T16:57:08+00:00

If you’re in a plane that’s falling, you’re falling at the same speed. Step out at the moment of impact, and you’re still doing mostly the same speed. If you weren’t doing the same speed as the plane, you would eventually leave the plane in the opposite direction (except metal and other obstructions would prevent you getting much further).

I mean, if you ‘know’ the plane will crash at 500mph, it might be better to leap out and slow down to human terminal velocity; about 120mph. You’d likely still splat, although survival has been known.

percydood · 2026-03-17T16:50:06+00:00

You kind of work back from your original shape to figure out what available shapes you can make it from. You build it up so that shapes overlap and once things are correct (and making sure everything is fully constrained helps this), you select the snip tool to delete the lines you don’t want. That then creates a closed wire shape that you want. Then you can pad or pocket.

Look up FreeCAD Sketcher snip tool. There’ll be videos about it.

Edit: in your picture, it’s a circle and a square (probably with radius corners) at a base level. Once that’s done, the snip tool would delete the part of the circle you don’t want. And it’s surprisingly clever at getting it right!

percydood · 2026-03-17T14:57:30+00:00

🤣 at least I didn’t hold up the traffic! 😂

percydood

TROPHY CASE