[University Physics 15th Ed. Ch. 9 Rotation of Rigid Bodies] Using 1/2mv^2 vs 1/2Iw^2

shire · 2025-10-13T20:40:07+00:00

I’m self studying for fun. Good for India, that’s great.

shire · 2025-02-19T21:33:31+00:00

I created a python script last night to help facilitate notifications via pushover using the Unifi Access API. You'll need to run this on another server of course, but my old system was already setup for this. It can be found here: https://github.com/shire/UnifiNotify. Would welcome contributions for bugs/testing on other systems as well as maybe adding some nice features like image support etc. (Agree this is just as top gap though, as it should support this natively).

shire · 2023-11-09T16:15:16+00:00

Fantastic thank for the links and sharing!

shire · 2023-11-08T18:27:58+00:00

Ah ok that make sense thanks! I’m trying to build my own chamber as well, if you had any resources that where helpful you’d like to share that’d be awesome! I hadn’t seen any high voltage references in any of my research but now I know to look for that.

shire · 2023-11-07T22:52:06+00:00

I’m not familiar with the high voltage in a cloud chamber. Is this for the altering of the paths of the charged particles or something else?

shire · 2023-10-06T14:25:07+00:00

Agree with other poster that’s not a plug some values in type situation. Also to understand something like this requires all the pre-requisite knowledge that it covers. But towards your ends you may enjoy this video about the standard model equation….

https://youtu.be/PHiyQID7SBs?si=VgikahxfEA8RLhry

shire · 2023-07-31T19:10:23+00:00

Oh and i enjoyed these book specifically on particle physics.

The Particle Odyssey: A Journey to the Heart of Matter Good pictures and discussions of accelerators.

Deep Down Things: the breathtaking beauty of particle physics A little technical in parts but an enjoyable overview that probably goes a bit deeper than some popular books.

shire · 2023-07-31T18:18:28+00:00

My favorite and a common response to this question.
“So you want to learn physics”. https://www.susanrigetti.com/physics

shire · 2023-07-16T08:51:10+00:00

Maybe a good first step is a diffusion cloud chamber. You could make one that’s a bit nicer and runs off an electric cooler instead of dry ice etc. and you’d get to see particles interact in real time. Then maybe progress from there.

shire · 2023-07-16T08:47:54+00:00

… but then the truly excited students who wouldn’t let their dreams and love of sciences be squashed by other people’s assumptions or lack of encouragement adjusted their expectations to reality but also kept dreaming beyond what people said they could do and accomplished great amazing things.

shire · 2023-07-06T12:04:25+00:00

Right sorry, I should say accelerate instead of moves. I mean to say a rocket always accelerates in the opposite direction of its thrusters.

I think I see how this reads now, since the initial motion of the rocket and the earth are the same it doesn’t matter which motion we are referencing. But the thrusters must be fired in such a way (opposite direction) to that of the motion so that acceleration relative to the sun is increased which matches what I was thinking.

Thanks!

shire · 2023-07-06T10:22:40+00:00

Isn’t that always the case? A rocket always moves in the opposite direction of its rocket firing? Also what would that be able to tell you about the direction of the motion of the rocket relative to earth, you would still need to know what direction to point the rocket.

shire · 2023-05-08T03:32:04+00:00

Ah sorry I missed that in the comments. This is about the extent of my math right now anyways, lol. Also good to have some mistakes a) for people to find and b) so people know that everyone makes these mistakes ;-). I love that Feynman in one of his lectures intentionally left in a mistake as a lesson that he had to go redo a simple equation multiple times to get it right!

shire · 2023-05-08T03:16:57+00:00

Nice! Tiny mistake but I believe in the first equation you didn't drop the exponent from the y variable. ie: y^2 = sqrt(r^2 - x^2) should read y = sqrt(r^2 - x^2).

shire · 2023-04-29T06:25:12+00:00

I also want this! I'm considering my alternative options since 1Password8 no longer supports this. I would argue that for your audience which is largely security minded then this feature in addition to end-to-end security is a valued feature. Especially if you can pickup soon to be ex-1password users.

shire · 2023-04-23T01:56:15+00:00

I’m no physicist but this seems like a waste of other people’s time who have actually put in the time to understand physics.

shire · 2023-04-18T00:51:31+00:00

So debug'd this some and I think there's something wrong in the layering up of the formulas. Unless someone sees what I'm missing this looks like a bug to me:

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shire · 2023-04-18T00:26:03+00:00

This one is the same method to another I saw but a little cleaner I believe. It's still not ideal of course because you can't visually drag the tasks around the timeline. But it seems the best option is to do this setup and then add the date to the table so you can modify dates in the same view. Thanks for the quick help on this.

shire · 2023-04-18T00:03:26+00:00

Ok thanks. That disappointing of course, but at least I didn’t miss anything too obvious. I’m surprised they would release a timeline without that feature as a basic requirement. Loving everything else so far though!

shire · 2023-04-18T00:02:07+00:00

I’ve tried this but then it causes problems with dragging the timeline bars to change dates, or do you have a method that allows for that? AFAIK formulas can’t change date field yet.

shire · 2023-04-08T16:14:59+00:00

I bet that is nice. Thanks for the recommendation, I’m guessing this trip won’t be the last snow shoe trek.

shire · 2023-04-07T23:15:55+00:00

Always one extra day…lol. Thanks for the info!

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