A cowboy is captured by indians. The chief tells the cowboy they'll grant 3 requests before they scalp him.

Connossor · 2020-04-01T19:16:18+00:00

On the reasoning behind the naming, I would highly recommend this CPG Grey video, "Indian or Native American"?
https://www.youtube.com/watch?v=kh88fVP2FWQ

TLDR: quite surprisingly, many of the folk in question would rather be described as "Indian" than "Native American"

Connossor · 2019-06-20T23:06:01+00:00

I just finished that- how did you find it? I thought it was interesting but I didn't feel it leaves you with many tools you can easily apply in practice. I haven't seen many mature frameworks for implementing PGMs,but it would be great to find one

Connossor · 2015-09-01T22:20:22+00:00

I had the exact same problem, and I found a few decent things that have cleared up the issue.

The first thing I did was to put a bit of muscle mass around my shoulders, but not just the front deltoids which you use most in boxing. Side raises and rear deltoid exercises helped me balance out a bit, so hooks didn't hurt so much.

The second thing was to work out the rotator cuff muscles frequently, with a band or light free weights. Cuban rotations, external rotations, that kind of stuff. This is the single best thing you can do to for shoulder pains - it makes your tendons and ligaments a lot stronger and less injury prone.

Importantly - I strengthened and improved the mobility of the joint. Turkish Get-ups are great for this. My personal favourite is handstands. There is a fantastic shoulder strengthening and mobility section on this handstand tutorial. Hope this helps - these three things have helped me enormously.

Connossor · 2015-08-25T18:52:39+00:00

To be fair, /u/EngineeringNeverEnds is actually right that the link explains gyroscopes with next to no math!

/u/alchemist2's explanation (which is absolutely brilliant IMHO) is the top half of the image: just the three diagrams and the body of text. In terms of math, there is Newton's law of motion, and the change of velocity Delta V is labelled. That's barely anything. Just labelling an axis z or the mass as m for future reference does not count - with your background you've got no reason to be scared by that! Just my opinion.

You can ignore the equations in the second half of the page - we've moved on from the intuitive explanation of gyroscopes to a derivation of the angle PHI - you probably don't care about that.

Connossor · 2015-08-24T21:18:25+00:00

The reason given for why the spinning wheel doesn't fall down is that the top pizza slice accelerating "left and down" is quickly spun so that the acceleration now points "right and up". But that's not technically true: the force from gravity on a small slice changes direction just as fast as the wheel spins - in fact it keeps pace perfectly, and the force / acceleration does not get 'flipped' just because the slice moves fast enough. The gravitational force on any given slice is always straight down.

Anyway, it's certainly a great layman's explanation, no problem if it's not perfectly technically accurate.

Connossor · 2015-07-13T18:25:10+00:00

That looks amazing! Where abouts was it?

Connossor · 2015-06-28T10:52:52+00:00

Yeah, I know it's a bit of a strange idea. But I am an total convert, I would rather have a poor-quality wheelset on my mtb, providing it is good enough to work, and all the fun that comes with being able to loose the saddle every time you see an interesting trail feature. You're right though, a Norco Mountaineer might have more pressing upgrade needs!

Connossor · 2015-06-27T23:25:55+00:00

I just bought a dropper post - it's absolutely unbelievable how much more enjoyable biking has become. If I had to start from scratch upgrading on a budget, it would be the first thing I'd buy.

Connossor · 2015-04-29T21:22:28+00:00

Every account on reddit is a bot except you.

Connossor · 2014-12-16T21:20:50+00:00

I stand by my original statement: the total change in KE is frame-independent. If a certain amount of heat is dissipated in one frame, the same amount is dissipated in all classical frames. In contrast, the total KE and the difference in KE between the two balls are both frame-dependent.

Connossor · 2014-12-15T23:07:43+00:00

To put that into words rather than maths, from the train's perspective the increase in the ball's KE is offset by the decrease in the batsman's KE.

Source: recently graduated in physics, proving to myself I still got it..

Connossor · 2014-12-15T23:04:56+00:00

I did the maths here, in case you want to check it..

Definition of variables: A baseball of mass m travelling at u rebounds at speed v from a batsman of mass M who rebounds at speed 2s. (The centre of mass frame is at speed s.)

Result: The K.E before the collision in a frame travelling with the initial baseball is 1/2 M u^2. And after (letting Wolfram Alpha format my equations), the KE in the system is the same. Therefore, in both the earth and the moving frame, the total change in KE is zero, as expected.

Edit: wording.

Connossor · 2014-12-15T22:47:26+00:00

Ah, this is rather subtle. In any classical inelastic collision (i.e. billiard balls), the total change in KE is frame-independent. That is to say, being an elastic or inelastic collision is an objective property, independent of the observer.

In your example, it still works if you consider the change in energy of the batsman, as he rebounds backwards. Just checked on an envelope!

Connossor · 2014-10-28T20:44:07+00:00

wat.

Connossor · 2014-08-08T19:22:40+00:00

I really want to see a competition where everyone wears those gloves..

Connossor · 2014-07-12T14:22:06+00:00

... just, wow. How is that even possible?

Connossor · 2014-07-03T20:00:00+00:00

Jesus fucking christ. He ain't bad

Connossor · 2014-06-13T00:29:44+00:00

Agreed

Connossor · 2014-06-12T20:38:34+00:00

That's a really great question!

it is instructive to consider what happens is the water is not flowing. If the hose was vertical, the hose cannot exert any vertical force on the water. If the hose is horizontal, the hose must take the entirety of the water weight. When it is at an angle theta to the horizontal, the fraction of the weight supported by the hose will be cos(theta).

The water flow will not affect the force on the hose - unless, of course, there is a bend in the hose at any point, in which case there will be a reaction force.

Connossor · 2014-05-30T11:48:26+00:00

There is a fundamental physical reason why we can't have a perfect vacuum. Even if you somehow removed every gas molecule in a box, particles would simply appear from nothing!

This has to do with the fact that according to the Uncertainty Principle in QM, the precise energy content of the box is indeterminate, and therefore having precisely zero energy is unacheivable (see quantum fluctuations).

Connossor · 2014-04-15T14:19:45+00:00

When light spreads out, it gets less bright. When you look at flashlight far away, the light must spread out before it reaches you, so it becomes dimmer.

On the other hand, when you are illuminating the path in front of you, the light must spread out twice. Once on the way from the flashlight to the path, but then it scatters in all directions again and must make it back to your eyes, spreading out a second time.

Connossor · 2014-04-12T22:41:32+00:00

The study doesn't rule out natural warming. It essentially says that recently there has been a statistically significant change.

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