Recent content by ShamelessGit

Russ Watters explanation is exactly how I modeled it in the document. By the way, I made a sign error mistake in the word document, but apart from that I think it is correct.

I was watering my garden the other day, and I noticed (obviously), that the water came out of the hose faster if I stuck my thumb at the end of the hose. Then I suddenly remembered that in physics class, I was taught that gravity-powered water pressure should result in an exit velocity which...

That other topic is NOT the same as this one. It gets frustrating when it seems like 2/3 of the people who answer my question don't understand what I'm talking about. Wikipedia says that matter falling into the event horizon approaches, but never crosses the event horizon. This directly...

If it is true that the thing never actually falls into the black hole, then wouldn't the correct model for a black hole that has eaten things since its creation, from an observer's perspective, be a singularity at the center plus a hollow shell at the event horizon of the things it has eaten?

Wikipedia says, "Likewise, any object approaching the horizon from the observer's side appears to slow down and never quite pass through the horizon, with its image becoming more and more redshifted as time elapses." So does this mean from the outside observer's perspective, that nothing ever...

So what I've seen so far from peterdonis is that light does not experience proper time, and they don't have a reference frame. So does that basically mean that my questions don't make sense? The issue I was having was that even if you accept that a special object A (light) always travels...

I know this thread is similar to another one that was posted recently (I really enjoyed reading it), but I think I have some other questions which aren't entirely redundant. BTW, I'm not looking for really mathematically rigorous explanations, because I probably wouldn't understand them...

thanks guys

This isn't a homework problem, and I'm not sure if I'm putting this in the right section, so I apologize in advance if I'm doing something wrong. So far I just learned hamiltonian and Lagrangian mechanics, but I was never taught about how fuel burns when a rocket accelerates, and I'm having a...

You're right! That does make it so much easier! Thanks!

Homework Statement I'm trying to learn relativity on my own by doing practice problems on the internet. One of the ones I'm having difficulty with is one where you have to calculate the threshold kinetic energy necessary to create an anti-proton by smashing two protons together. I think you...

I made a type when trying to fix the previous typo. Yes the limit is only from 0 to r. Srry about that. I didn't make that mistake on the paper when I was actually trying to integrate

I made a typo when I was giving the limits of integration. The way I set it up the limit of integration for r should be -r to r. And also I figured out that when I integrate properly, I do get the right answer. The mistake I made was that I changed y to sqrt(R^2-x^2) in my original...

Homework Statement I want to calculate the moment of inertia of a spinning disk via integration. I'm aware of the perpedicular axis theorem, but I want to integrate. Homework Equations I = ∫r^2dm The Attempt at a Solution if I set my coordinate axis op so that the origin of the...

Homework Statement There is a section in my book that has the same title as the title of this discussion topic. I understand the math just fine, so this is a conceptual question. In the book the cross section is shaped and oriented like a C, and it shows the shear flow flowing...