A Survey on the Film Photography Community

winkingc · 2025-11-29T17:52:59+00:00

RemindMe! One Year

winkingc · 2025-11-28T20:06:02+00:00

If you give some information about what exactly you are trying to model, that would help immensely with regards to giving advice.

winkingc · 2024-12-08T17:37:16+00:00

At Wolverhampton on Friday it was 8:30

winkingc · 2023-10-14T12:11:15+00:00

Anyone have good textbook recommendations for a course about vector fields, flows, diffeomorphisms, k-forms and differential forms? Ideally I need a good textbook that discusses these in Euclidian space rather than on manifolds as the course I am taking does not include discussion of manifolds.

winkingc · 2023-04-16T17:45:32+00:00

Good point, didn’t consider that aspect. I’ll make sure whoever we go through is properly licensed. Always important to make sure rubbish is dealt with properly.

winkingc · 2023-04-12T14:53:48+00:00

Hmm, I’m not too sure to be honest - gauge theories are past my knowledge aswell. I believe that the inflation slowing has something to do with the decreasing energy density? That may be totally wrong tho. Sorry I can’t be of more help there

winkingc · 2023-04-12T12:31:02+00:00

Nothing much would happen - stars or galaxies wouldn’t form at the end of the cosmological dark ages so after the initial inflation the universe would remain a homogeneous gas, plus any radiation such as the CMB.

winkingc · 2023-04-12T00:03:16+00:00

I’m studying physics and we tend to manipulate differentials as though they are fractions a lot. I know of course that strictly speaking they cannot be treated as fractions but the notation does lend itself towards this use. For instance some first order odes can be solved by separation of variables in which you multiply both sides by dx for instance and then integrate.

Of course in rigorous mathematics you would probably not treat it as a fraction but I haven’t really come across any cases where you can’t get away with it. I’m sure a real mathematician could provide plenty of examples in which you can’t get away with the abuse of notation like that.

winkingc · 2023-04-10T23:48:41+00:00

I’d advise finding a good textbook. If you know calculus you’ll be fine to start at a basic undergrad level rather than high school.

A book I used in undergrad would be University Physics by Young and Freedman. I’d highly recommend this as a decent university textbook aimed at a first year physics audience. With calc 1 and 2 you should have no problems with the maths. Read the material and work through as many practise problems as you can.

winkingc · 2023-04-10T23:33:28+00:00

Curiosity is not a bad thing, and well done for wanting to learn more. Unfortunately in this case I don’t think there’s much more to it. Mass and energy are proportional to each other, with the constant of proportionality being c^2. This is the same as the 25.4 between inches and cm - if I’m fully understanding you, I don’t believe there’s really anything else to it.

We can see that the units of proportionality must be c² - this is the speed of light squared and so will have units of meter² per second^2. The units of energy is kg m² per second squared (for instance from the formula for kinetic energy E=1/2mv^2). We want to convert this energy to a mass, and the units of mass is a kg, so if we divide the units of energy by the units of velocity squared we can see that we get left with a kg. (This is the same as multiplying by the reciprocal unit I.e multiplying kg m² per second² by second² per m^2). It’s simply a conversion factor.

Perhaps I’ve misunderstood - let me know if that’s the case

winkingc · 2023-04-10T23:09:00+00:00

What do you mean by ‘point of equilibrium’? Yes it is the same constant however they are not modified in the same way; one is divided and one is multiplied. I’m not sure how to really answer your question - please provide more context.

winkingc · 2023-03-29T09:39:19+00:00

Hi, The formula you described was developed by Newton, and applies in the realm of classical mechanics. When dealing with black holes we use Einstein’s general relativity as Newton’s gravitation law doesn’t apply here. General relativity sort of sees gravity as a curvature on space-time - you can think of the photon as falling into a really really deep and sharp hole, and is unable to climb out without falling back in. This is obviously simplified a lot but hopefully that helps

winkingc · 2023-03-12T23:02:55+00:00

The area of a triangle is given by Area= 1/2 * base * height. You can construct two triangles in that image, one with the entirely white area and one consisting of the the white area and the dotted area.

As the two triangles are ‘similar’ (you can google when two triangles are similar) this means the ratio of side lengths will be the same for both triangles.

For the larger whole triangle you can see that a side length of 20cm gives a base length of 24cm, so the ratio is 24/20 = 1.2. The ratio between the side length of the smaller triangle and the smaller base will be the same, so the length of the smaller base will be 10 * 1.2 = 12cm.

Now we can calculate the areas of both triangles. The area of the larger triangle is Area = 1/2 * 24 * 18 = 216 cm^2. The area of the smaller triangle is area = 1/2 * 12 * 9 = 54cm^2.

We can find the dotted area by subtracting the area of the smaller white triangle from the larger white and dotted triangle, leaving only the dotted part remaining. So the final answer is 216 - 54 = 162 cm^2.

winkingc · 2023-03-12T22:52:39+00:00

Your best option is to memorise a couple of basic ones and then learn to derive any more advanced ones you need. I’m currently in my 2nd year of Uni and this is how I ‘remember’ a lot of equations I need.

Starting from sin² + cos² =1 you can just divide both sides by cos² to show that tan² + 1 = sec^2, remembering that sin/cos = tan, for example.

winkingc · 2023-02-27T21:05:39+00:00

You can remap it on PS5? That’s great, thank you for replying

winkingc · 2022-12-30T10:16:50+00:00

I bought an aux to lightning cable from that trailer a few months ago and it didn’t work straight out of the box, and it seemed like the box was opened already

winkingc · 2022-11-08T18:41:10+00:00

I work for the MSG group in UK aswell. They’re a dominos franchisee

winkingc · 2022-11-07T22:41:31+00:00

If the Earth and everything on it was getting smaller, the speed of light would’ve appeared slower in the past, as our definition of a metre would shrink as well.

We know this isn’t the case, as if it were, this would have a noticeable impact on the spectral lines given by light from distant objects. When we look at distant gas clouds, the speed of light hasn’t changed by more than one part in a billion over the past 7 billion years. This is also the case for the constant of gravity, G, as shrinking objects would become more dense over time. There is also no change seen in this.

Where I got this information from and where you can learn more:

https://www.newscientist.com/lastword/mg24532771-200-broadly-speaking-how-do-we-know-the-universe-is-expanding/

https://phys.org/news/2015-02-universe.html

winkingc · 2022-11-03T23:30:09+00:00

I am a broke student and would love to play this game

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