MigL

Sorry Steve; you're absolutely right. The proper terminology is the first thing you forget when its not used regularly. Thanks for the correction.

As far as I know static, non rotating Black Hole would be almost impossible, as any object, having even the slightest rotation ( almost all astronomical objects do ), would see that rotation amplified immensely during gravitational collapse. Charge itself is extremely hard to retain for a collapsing body which sheds some of its mass in a ( super )nova explosion, as the EM force is 36 orders of magnitude stronger than gravity at the atomic level. It would get rid of any excess charge way before the collapse. The only physical ( viable ) solution seems to be the rotating, non-charged Kerr solution. But of course I could be ( and have often been ) wrong.

I believe what Dubbelosix is really asking, is how does a system go from being completely reversible, where you can't tell forward progression in time from backward progression, to one that is irreversible. Whereas the constituent atoms of the egg can just as likely fly apart as move together, the egg itself , having fallen off the table and breaking up, will never spontaneously put itself back together again. ( not even with the help of all the king's horses and all the king's men ) The thing about 'random' is that you can never prove if a process or sequence is random, only if it isn't.

The 'fictitious' centrifugal force is at play here, because of the rotating frame, and is equivalent to Mrw^2, where M=mass, r=radial distance and w=angular speed. In the corners both r and w are larger, so they feel a greater apparent force. So, yeah, walking to the center of a face would be walking 'up-hill' and water would pool in the corners.

The radial distance to the corners of the cube is larger, so the angular speed is different as is the apparent force. And pressurization is easier with smoothly curved surfaces as opposed to sharp corners.

When an object moves through the air, it compresses the air molecules ahead of it. These pressure pulses ( essentially a sound wave ) are able to move forward at the speed of sound, and impact other molecules to move them out of the way. When an object is moving supersonically, the compressed molecules are no longer able to travel ahead and move subsequent molecules out of the way. The pressure pulse 'piles up' ahead of the moving object and creates a shock wave. This shock wave is in the shape of a boat's wake, except its conical, and the faster the speed ( supersonic ), the more acute the angle of the 'V', or cone. All along this 'V' there is a steep pressure gradient, which get weaker the farther away you are along the 'legs' of the 'V'. A large object, like an F-111 aircraft, which can fly supersonically ( M 1.2 ) at 200 ft altitude, would cause considerable damage/injuries if flown over a city. It is said that if the squadron of F-111, which attacked Lybia in the 80s, hadn't dropped any bombs, but had just flown supersonic over the target, they could have caused more destruction than the precision guided bombs, and possibly have taken out Muammar Gaddafi.

Some of you, in your rush to pillory Waitforufo, are not reading his posts. ( the only one who understood is iNow ) He's not claiming that the car driver should get off, on the contrary, he calls him a murderer; He is saying that, with the way the Justice system works, there is a distinct possibility that a murderer might be set free. Its not like it hasn't happened before. ( have a drink of 'juice' and think about it )

Delusions of grandeur do not make you a dictator, RangerX. The fact that he's been able to accomplish little of his original agenda, and has been foiled at every turn by a few of the remaining dedicated politicians left ( Democrats as well as some Republicans, not the a*s kissers ) proves he isn't. I'm not familiar enough with the American Constitution to say which parts he has violated, if any. I can say that he has violated most aspects of human decency.

Something that should be cleared up... Both mass and energy are properties of the system, more exactly, in a static situation, energy is related to the configuration of the system. As we wind the film back towards t=0, we get to the time of the Electroweak symmetry break, which precipitated out the Higgs field. It is the interaction of this field with certain particles which gives them the property of mass. At any time before the electroweak symmetry break, the concept of mass is undefined. If you are going to discuss conditions at about the Planck time, you are talking about energy ( the system's configuration ), not mass, as there is no such thing ( yet ). And contrary to what you may believe, there is no 'compression' once a Black Hole throws up an event horizon. The path followed, as Strange has pointed out numerous times, is not a path through space, but a path forward in time. There is no compression leading to heating as with a gas. The entropy of a BH is determined by the area of its event horizon ( see Hawking/Bekenstein ), and from the entropy we can determine the temperature, which for massive BHs is close to abs. zero. Temperature increases as BHs get smaller, such that only micro BHs that have high temps.

" having read some of your posts on political issues, we will never agree " ???? Maybe that's your problem, Interested, you confuse political OPINION with scientific FACTS and OBSERVATIONS.

Its not too often that I agree with RangerX, but just to add to the list of trade deals that have been 're-negotiated' in bad faith by the current American administration, I offer up the Boeing dispute with Bombardier and its new C series airliners. Boeing, afraid that their slice of the airliner pie is shrinking from competition by Airbus and Embraer, and emboldened by the Trump administration's 'America First', decided to go after Bombardier ( before they become viable competition ) when Delta ordered 90 aircraft from them. They launched a complaint with the State Department, which promptly slapped a 300% tariff on the Bombardier airliners, as Boeing claims they cost 80 mill apiece to produce, but Delta is only getting charged approx. 20 mill apiece. They claim Bombardier can afford to do this because of government ( federal and provincial ) subsidies; This claim from a defense contractor, the most heavily subsidized American industry. Delta still wants their aircraft, though, so Airbus walks in and buys a 51% controlling interest in the C series, and since Airbus produces some of their aircraft in the US, they are able to sell without tariffs. Airbus gained market share, and Boeing got bent over and violated. This type of attitude with the US' biggest/best trading partners will come back to bite them in the a*s everytime, and is counterproductive to rebuilding/improving the economy which Waitforufo remembers. Unfortunately, I don't think the manufacturing jobs which provided that robust economy, and which left North America during/after that period are ever coming back.

" I prefer to ask questions rather than speculate and argue, so I am withdrawing from this forum for the time being at least BYE " Really ? With every misinformed post you make, you include some unfounded speculation. You are misinformed about Black Holes, galactic formation, GR, and the Big Bang. I suggest Strange is being very patient with you. Don't squander it, learn something. ( Sorry for being curt, I'm feeling 'bitchy' today )

And C Rose too ? But still nothing more on the allegations of sexual misconduct by D Trump ?

The politics of Black Holes ? Why is there a political/religious undercurrent to anything we discuss here ? Next thing someone will be comparing D Trump's divisiveness to Dark Energy separating everything at an increasing rate.

If you have a look at a Penrose diagram for a rotating or charged Black Hole, there are certain time-like paths ( as opposed to space-like which involves superluminal speeds ) which lead back to normal space-time OUTSIDE the BH's event horizon. Whether this 'outside' is in our universe or another, or even if this is a physical interpretation ( or not ), is anyone's guess

Waitforufo did not create a 'shit' show. He posted something which is important to him, and INVITED people to discuss. If you didn't think the topic was worth discussing, why did you participate ?

Your assumption is that citizens forced to vote, will educate themselves on the issues. Otherwise you have a group of people playing Tic-Tac-Toe on their ballot forms.

The 'laws of Physics' ALWAYS apply. It is our modeling that ceases to apply in some conditions.

An i5 2500 will do approx. 3.75 GFLOPS per core at stock speeds, while an i7 7700 will do 5 GFLOPS per core at stock speeds. A GTX 550 will do 7.2Gpxl, 29Gtxl and 69 GFLOPS, while a GTX 1080 will do 110 Gpxl, 277 Gtxl and 8800GFLOPS. Do you see how the video card is an order of magnitude faster in filling, texturing and floating point ops, while the processor, even at stock speeds, is only an incremental increase in floating point ops ? They build supercomputers with graphics cards these days !

The bottleneck for graphics/gaming is not the CPU, but the GPU. As a matter of fact for single threaded applications, such as most games, your old overclocked i5 is probably comparable if you use the same video card on both the i5 and i7. Intel hasn't had much competition for the past few years so they haven't increased core performance much; they've been concentrating on decreasing power consumption and increased core counts to compete with ARM based processors. We'll see what happens now that AMD has viable competition again.

When these countries were ruled by Communism ( Russian puppet dictators ), any such protests were quickly and violently put down by paramilitary police ( and tanks ). At least now people are allowed to voice their opinions publically , without fear of 'government' reprisals. No matter how vile ( or just ) their cause. That's what's good ( and bad ) about democracy.

I realize I'm making light of these troubling situations, but, wouldn't you lose your erection when the two young women started laughing at you ?

If the mass/energy of the Sun were to suddenly 'disappear', space-time in its vicinity would no longer have a need for curvature, and would 'spring back' to the nearly flat curvature of intra-galactic space. The gravitational wave, caused by this springing back, would cause a 3d ripple, spreading outwards at the speed of light, with the equivalent energy of one solar mass. This doesn't sound like quadrupole radiation, but the energy of the curved space-time has to be dissipated, and the only mechanism I know of is a gravitational wave. Maybe someone with a better understanding of GR can correct me if I'm wrong. ( furiously looking through my copy of Gravitation for clarification ) How many solar masses disappeared in the recent collision of two black holes ? And how distant were they ? ( IIRC, 3 solar masses 'disappeared' in the collision about a billion LY away, and the detector registered about a trillionth of an inch ) Now imagine the effects of a solar mass/energy gravitational wave at only 150 mill km.

The 'assholes at the helm' are voted in by the people. Italy faced a similar situation after WW2. They had lived under Fascism for two decades, and when the war ended, and they had a choice again, they didn't just steer back to the center, but went a full 180 deg. towards Communism. It was only American intervention and economic support that steered them back towards a centrist democracy. I think Poland and a few of her Eastern European neighbors are doing the same, but in the opposing direction. I have faith in the Polish people, that the oscillations about the center won't diverge.

Poland, as a country, has had its borders re-drawn by neighboring countries many times, and has at times totally disappeared ( Prussians and Russians ). They have lived through a century of suffering, also at the hands of neighboring countries. It is this historical 'memory' which gives them the right to be suspicious of 'foreigners'. That being said, I live in what used to be a mostly ethnic neighborhood ( Polish and Italian ), my next door neighbor is Polish, as are numerous others on the street. None are racist, rather, some of the best people I know. The only difference is that they've had exposure to a wider world. I hold out a similar hope for the people of Poland. Once their economy and tourism are more integrated with the rest of Europe, once there is a wider exposure of its people to Western European thinking and ideals, once they get over the memories of history, they too will change. The pendulum has simply swung too far, and will correct itself.