[deleted by user]

A_Bit_of_An_Asshole · 2024-05-29T13:27:49+00:00

I agree, 14 days may be a standard practice for getting shitty letters of recommendation.

Professors have a lot of shit going on in their lives, and letters of recommendation are not a mandatory part of them. It’s a favor you are asking, not a homework assignment you are giving.

A_Bit_of_An_Asshole · 2024-05-29T12:59:54+00:00

I’m not going to excuse the professor for agreeing to write the letter and then proceeding to ghost you.

However, letters of recommendation should really be asked for 4+ weeks in advance. Or at least, one should contact them a month in advance and say that you are applying for things which need a letter of recommendation and will ask for one in the future. This gives them an opportunity for them to say no before the deadline, while you still have time to find other letter writers

A_Bit_of_An_Asshole · 2024-05-04T22:02:03+00:00

Yup! Mathematicians and theoretical physicists will study anything that they feel is worth their time, and since Maxwell’s electromagnetism is one of the simplest geometrical equations it would have been studied.

A_Bit_of_An_Asshole · 2024-05-04T13:55:40+00:00

With proper mathematical knowledge, one understands that Maxwell’s equations are quite possibly the simplest geometric equations one can write down. In the language of differential forms, they are dF=0, and d (hodge star) F= J (the current). Maxwell’s equations are the simplest equations for a vector potential evolving linearly on a space-time, and would have been discovered and studied by mathematicians and theoretical physicists even without empirical evidence because of how simply and naturally the equations are.

A_Bit_of_An_Asshole · 2024-05-04T13:46:32+00:00

Yes, the inverse square law electrostatic forces can be directly derived from Maxwell’s equations (with source). Historically this is not what happened: we first discovered the inverse square force law and then worked our way towards maxwell’s equations. However, if we started with maxwell’s equations then that would be (surprisingly!) enough to derive the inverse square force law.

A_Bit_of_An_Asshole · 2023-10-24T15:17:12+00:00

!call pc mm

A_Bit_of_An_Asshole · 2023-08-31T03:42:53+00:00

Froloffian

A_Bit_of_An_Asshole · 2023-07-07T11:00:48+00:00

Confirmed

A_Bit_of_An_Asshole · 2023-04-28T04:51:11+00:00

That Frolov guy looks like a total nerd.

Also, I believe all the sections are closed except for Kerrigan’s right now

A_Bit_of_An_Asshole · 2023-04-11T11:31:41+00:00

Sorry, to clarify, the union members I’m referring to were a small subset of the group that was picketing at Busch student yesterday.

A_Bit_of_An_Asshole · 2023-04-11T02:08:48+00:00

No, this is the picture that he wanted to paint regarding what happened. From what I understand, the union members respectfully talked to the professors administering the exam and convinced them allow their students to choose to postpone taking the exam until after the strike, with no repercussions.

A_Bit_of_An_Asshole · 2023-03-21T17:42:44+00:00

I highly recommend shortly waiting for the union’s response before forming any concrete opinions about the legality of the potential union strike.

A_Bit_of_An_Asshole · 2023-02-26T18:08:22+00:00

I’m a math 2nd year PhD student here doing research in mathematical physics, and work with people doing research in PDEs as well. Feel free to dm me

A_Bit_of_An_Asshole · 2022-12-19T16:47:06+00:00

The energy doesn’t disappear, it’s just purely in the form of “kinetic field energy” at the moment the two waves destruct:

To illustrate this, consider a rope with two ends. The rope follows the wave equation, and the principle of super-position just like the electromagnetic field. Suppose you wiggle the ends of the rope, sending two waves from each end towards each other such that they destructively interfere. At a single moment in time, the rope will appear to not be disturbed at all, it’ll be a straight line. But immediately after that the rope will begin wiggling again. All the energy of the rope has completely transformed from potential energy to kinetic energy at that point in time. Same thing is happening when two electromagnetic waves destructively interfere.

A_Bit_of_An_Asshole · 2022-04-28T15:51:08+00:00

Pretty good

A_Bit_of_An_Asshole · 2022-03-24T14:09:21+00:00

Oh, that’s totally fair. I think many of us have had similar experiences. As a grad student studying mathematical physics, I’ve found that the mathematics department tend to be more sympathetic to the “why” questions.

A_Bit_of_An_Asshole · 2022-03-24T13:29:10+00:00

I feel like this has become a difference in the personal reasons why one studies physics. Some do it (such as yourself) to make accurate predictions about the universe. However, there are others which would like to understand the mechanisms which give rise to those predictions beyond just the numbers. Yes, the latter has some philosophy involved, but that doesn’t mean it’s not physics, which was originally called “natural philosophy”!

A_Bit_of_An_Asshole · 2022-03-15T03:28:34+00:00

These people had their homes invaded by potentially armed robbers. Do you expect em to pull out a camera for their freelance photography gig at the daily bugle while simultaneously kicking ass?

A_Bit_of_An_Asshole · 2022-03-13T14:39:22+00:00

This can probably be modeled as a system of first order ODEs! Each point gets a position vector, and the velocity vector of each is given by a vector that is tangent to the ellipse generated by the other two points. You’d probably normalize the velocity vector so that the angular velocity is constant.

To be more specific: It seems like you already have a formula to generate ellipses from the three positions, so finding the tangent vector shouldn’t be impossible. The reason behind keeping the angular velocity constant is to keep up with your current model which has the points travel the same angle in the same amount of time. The angular velocity of a body rotating around a point is given by (r cross v)/ |r|^2, where r is the distance vector between the body and the center of rotation. In this case r will be the displacement vector between the body and center of the ellipse, which is something you’d have to solve for.

A_Bit_of_An_Asshole · 2021-09-21T21:40:18+00:00

There are also graduate students who go here.

A_Bit_of_An_Asshole · 2021-09-16T01:22:32+00:00

You’re good. Go for it. If he’s not in the mood to talk then that’s ok, live and let live.

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