runaway Definition and 16 Threads

There seems evidence for a runaway supermassive black hole. https://phys.org/news/2023-04-strange-streak-young-stars-evidence.html

There is a well-known Abraham-Lorentz equation describing radiative friction. Suppose a particle moves in an electromagnetic field. ma(t)=q(E+vxB) + m(tau)a’(t) By solving this equation numerically, I get non-physical solutions(runaway solutions) Although, it would seem that an electron in an...

Part I: Introduction to the problem. I made this thread to document and discuss the repairs I made to my 10" LX2000-ACF telescope to fix a declination runaway problem. It involves replacing an optical encoder attached to the declination/altitude motor. I expect this documentation will be broken...

I presume that numerous competent engineering organizations have addressed anchor drop brake designs many times in history. Nevertheless, runaway anchor drop accidents happen again and again. Therefore, I conclude that the general problem remains unsolved. How would our PF engineers...

I was asked to show that a system has run away solutions, the implications of which are that it is inherently unstable.

The references below describe two interrelated relativistic issues that come up when you try to describe radiation from point charges: 1. We normally expect that an accelerating charge would radiate, but this would seem to violate the equivalence principle. 2. Classical E&M can't describe point...

Why doesn't the ceramic pellets react with each other in the fuel tube when it is being fabricated?

I was watching this video and I have the question, if using a bjt as a diode what is the difference (thermal characteristics) from a regular diode, I ask this because on-semi makes bjt's with diodes in them specifically for class ab amps, is their any benefit besides less thermal lag?

Homework Statement I'm trying to create a simple excel simulation for runaway electrons using a given energy-loss per unit distance equation (Bethe formula). I'm stepping through time (pico-seconds) and giving the the electric field some initial value at a distance of 1mm and from there...

Was reading about runaway electrons in magnetic fusion. Had me thinking what would be the benefit/cost of engineering a device which creates a beam of reletivistic electrons. What would be the best way to extract energy from this system and does it even matter the speed they are traveling?

Hello! Homework Statement The question is "Calculate the energy released if a 1 solar mass white dwarf undergoes a thermonuclear runaway and converts 0.5 solar mass of carbon (A=12) to iron (A=56)." I've only ever done nuclear equations with hydrogen fusion, with four hydrogens to one...

IF I am in error, forgive me. but I had this thought cross my mind today. IF absolute 0 is the stopping of all atomic (or molecular) movement. and you induce a thermal reaction, i.e. splitting the nuclei. would the reaction be slowed down at all? (to make a slow burn) Yea. I understand...

Hi everyone, Ok this got to be a very simple question... "Calculate the energy released if a 1 solar mass white dwarf undergoes a thermonuclear runaway and converts 0.5 solar masses of carbon (A=12) to iron (A=56)." I know I'm supposed to use e=mc², but I would like to know what the reaction...

Truck brakes can fail if they get too hot. In some mountainous areas, ramps of loose gravel are constructed to stop runaway trucks that have lost their brakes. The combination of a slight upward slope and a large coefficient of friction in the gravel brings the truck safely to a halt. Suppose a...

I'm trying to understand why the voltage in a series LC resonant circuit exponentially rises? Can anyone explain exactly what happens that creates the effect? I've been wonding if it the distributed capacitance of L becomes a voltage multiplier, or if it is a voltage wave reflection...

HI everybody. I'm here with a question that I would like to discuss with you. As you all probably know better than I do, in classical electromagnetism there exists the so called "Runaway solution", i.e. the auto-acceleration of a charged particle. It is not clear to me how this problem can...