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! Moderator Note Any more posts in Homework Help from you will be removed to the Trash. Work on your own misunderstandings before trying to teach others.

So did russia, with their limited access to the Black Sea ( and the Mediterranean ). Did that give them the right to annex the port of Sevastopol, or the whole Crimean peninsula ?

My take on this subject is that Russia was not happy when the US declared a change of military focus from them to China., hence the posturing on the Russia's borders. Ultimately, I think it is worried about NATO getting a strike advantage in a conflict by arming up in neghbouring countries. China is much more the empire-builder than Russia, I think, and has better resources to fulfill its expansionist objectives. China seems to be playing the war-by-attrition game, with constant incursions of Taiwanese airspace and island-building BS to claim stakes in geographical continuity with the artificial islands. If NATO states publicly that it has no intention of military build-up in the neighbouring countries , Russian forces will probably disperse. I feel this issue is more to do with pragmatism than ideology. China is ideologically driven, so conflict is more likely. China is trying to win by capturing inches of territory quietly, until it has it all... it is implacably and slowly wedging its way foward.

Yes of course he's right. The best way to think about it to to understand the word 'units'. A unit is 1 whole of anything. Even easier to think in terms of something that only comes in whole numbers for example eggs. So the unit is a single egg or 1egg. 5 eggs The 5 and the eggs are separate. So we have 5 x 1_egg. Similarly 5 metres is really 5 x 1_metre

! Moderator Note Oh gosh, don't be sorry! Thanks for the time we got to waste with you! Bye!

Indeed, we have to re-evaluate what an economy means, the problem is, most of us (by which I mean the important people) are too comfortable...

You would think so, but hat we've done, in the case of woodland termites is urbanize them - we just brought them, along with their food, into the cities, where we become more aware of their activity. Aware and annoyed -- without thinking about the vital role they play in nature: they're part of the recycling brigade. The grassland is a different story: termites don't hurt the grass, until the cattle have already damaged it and leave nothing for the insects to eat but the roots. In fact, left to their own devices, they would do more good than harm. Yes. We poison our own environment and habitation to get rid of them - except in the places I mentioned where they go unseen. Even in the forest, when we go in to cut timber, we leave a lot of unwanted dead limbs and stumps behind - waste wood that choke all the new growth if something didn't actively break it down into usable mulch and compost. How much better to not import them from the forest in the first place? https://www.weforum.org/agenda/2020/02/plastic-waste-building-materials-canada/ I like wood, too. So we can make the frame and shell from recycled plastic and put a wood facing on it, where it's exposed and uninviting to termites. Just one suggestion. Anyhow, I think this whole termites and climate change 'problem' is a red herring. Yes, they make methane and carbon dioxide - they always did, without anybody getting upset, until we, who produce a whole lot more of those harmful gases, needed a scapegoat "Hey Look over there! Thetermitesdoneit." The plants are not here for us; we are here only because the plants were here first. The insects are not here to help or hurt us; they were here before us, maintaining a system that made us possible. They didn't mess it up; we did.

Our Math teacher worked on a weekly cycle. He didn't need, use a textbook except to set homework. I will start the cycle on a Friday. On Friday he picked up the textbook and looked at the set questions for the section/chapter he had been teaching that week. He picked out several questions saying do questions 3,5,6, and 9 or whatever. The other subject teachers knew to avoid weekends for homework. On Monday he would pick up the chalk, stand poised at the blackboard and say OK Smith, question 3 start me off. He would then write on the board whatever Smith said and the rest of the class were expected to comment if they disagreed. Once Smith had a correct start he would switch to Jones for the next step and so on until the answer was written on the board. In this way the whole class worked collectively through all the questions sometimes into Tuesday as well. He said, "I don't mark homework, you mark your own. At this stage you are old enough to realise the only person you can cheat is yourselves." On Tuesday/Wednesday he would walk up and down in front of the board expousing that week's theory and writing it on the board in his own way from memory. We would copy it down (enough time was given unlike at university). We could also stop him and ask for clarification or challenge a mistake at any point. He would always explain the point and not move on until it was clear. Thursday and Friday we would work collectively through example questions he dreamt up on the spot, in much the same way as the homework set on Friday. His comment on the textbook, "Now you are in the senior class you may be pleased to see that the (numerical) answers are in the back of the book. You may think that is great but will find it a introduces its own burden as you will not want to leave a question until you have got that answer."

What is not moving in the horizontal (x) direction in your coordinate system ?

The wedge M is moving sideways to the right only. It has zero vertical movement. mass m is moving downwards and to the horizonally to left relative to the floor, but at the same time it is sitting on wedge M so is also moving to the right the same as wedge M. So mass m has a net sideways movement relative to the floor of two motions. Does this help? Hint think about what swansont said about coordinate systems.

Aha I see. So you have a working fluid, in effect, that is recycled, being accelerated by the thruster and then decelerated, 3/4 by the KE converter and 1/4 by the right hand wall of the box. So that deals with my query about the box blowing up. Fair enough. A word about Inelastic collisions: these do not conserve kinetic energy, because they convert some of it to heat. However they do conserve momentum. This is why your idea that the KE converter experiences no force from the exhaust it intercepts can't be correct. I am not sure your 3 questions are very relevant to this issue, but maybe you will explain why you think they are if I answer. So here goes: 1) total momentum of the ball + box system before the collision is m1v1 +m2v2 = 1x10 + 1x0 = 10kgm/sec, in the direction of motion of the ball (momentum is a vector). This is conserved during the collision, whether elastic or not. If the ball sticks to the box, then after the collision we have one mass of 2kg, still with a momentum of 10kgm/sec. So v = 5m/sec, still in the direction of motion of the ball. (Note, in passing, that the kinetic energy of the system has decreased from 50J to 25J, so 25J have been converted to heat). 2) if the ball is 3kg and the box still 1kg then total momentum before is 3x 3.333 +1x0 ~10kgm/sec, in the direction of the ball. After the collision we have a single 4kg mass. So v =10/4 = 2.5m/sec, again in the direction of motion of the ball. 3) Initial momentum is zero so this is conserved after the throw, i.e. 100xv1 +100xv2=0. Therefore v2 = -v1. So if v1 = 10m/sec for the ball then you recoil at v2= -10m/sec, in other words at 10m/sec in the direction opposite to that of the motion of the ball. What light does that shed on the problem of your thruster setup?

No problem about the clarity I understood the question well enough and that's what discussion in Homework help is for. Yes you are correct that the wedge M slides along the table or floor in the horizontally opposite direction to the mass m. It is important to understand that this happens while the mass m is sliding down the slope. So the motion of the wedge M is simple, but the motion of mass m is complicated because it's total acceleration is the resultant of three accelerations. Can you see what these are ?

Both masses will accelerate There is no applied acceleration This is not part of the problem. No, it's not. My advice to the OP is to ignore your post entirely. (if you want to discuss your misconceptions it should be done in a different thread) It's usually better to choose one coordinate system for the entire problem. In this case the motion of the two blocks are related, and you've introduced an easy way to make a sign error when you relate the two sets of equations. Extra care must be taken to keep track of the information

There's no discrepancy there. Methane is 80 times more warming, but CO2 persists much longer. So, over a 100 year period, the factor is 25, because the Methane has dwindled but the CO2 is still around.

Where America has Manifest Destiny, China has the Mandate of Heaven- they have a fundamentally different attitude to government than America, a more trusting one based on Confucian principles. Similar to evolved systems, neither is 'correct' but has benefits/risks. One more prone dictatorships, but also easier to harmonise to a purpose: if Covid 19 had been more virulent the benefits of the latter would be more clear. The Chinese people have been rebelling against governments at least a thousand years before the country that established America even existed, so I wouldn't worry about them being passive - as long as the government is fulfilling its end of the Mandate, the Chinese people are content, and why wouldn't they be? We might disagree with their position but we don't get to impose our view on them and to mistake it as docility is just to misunderstand their mindset. China's military aggression in and around the South China Sea needs to be understood in its historical context - China still remembers its utter humiliation by numerous Western powers and Japan. The Chinese people generally support their government in establishing a strong military presence around its territory to ensure that never happens again. If the West wants to limit China's influence they should stop bullying nations and start helping them. For instance, Australia has been harassing East Timor for decades in order to force access to oil fields, even pulling out of the UN convention on the Law of the Sea to avoid a binding ruling at the international court of justice. Now East Timor has invited China to help build up their infrastructure, giving China a presence right on Australia's coast. Taiwan has about a quarter of the semiconductor market. China would control over a third if it swallowed Taiwan.

I'm very keen that forests should be preserved. But for me, it's to preserve species and habitats. I think the climate value is overstated. A mature forsest has an awful lot of rotting wood, and that produces a heck of a lot of methane. I read somewhere that termites on their own produce far more methane than cows across the world. And the carbon cycle for a mature forest is pretty much in balance. It takes in CO2, and emits it, in roughly equal measures. A brand new forest, growing up from nothing, will store carbon for quite a while, but eventually it reaches balance. The only real carbon sinks are in the ocean, tiny animals producing shells that turn into rocks.

I agree that teaching can motivate you to learn and can point out your knowledge deficiencies, it doesn’t inherently increase your knowledge. And you have to honestly assess whether you understand something - when a question is posed to you, can you answer it or are you BS-ing your way through it? We’ve seen a lot of examples here of people (at least one claimed to have been a teacher) who were very confused about some basic concepts while insisting they understood.

The problem in the world is that in politics , the worlds politicians who have advisors try to come across as smart , using word gibberish rather than open transparency . Me peronally if I was Joe Biden, I would directly contact Xi Jinping and state my case transparently , we all love China and the Chinese people but we feel you are wrong in ill treating minorites in regards to morals . As for Japan , they should also make way towards China in friendship because unless the world finally unites , the world is probably over . We have more important things than war games to consider at the moment .

Why antoganise the Chinese by sending ships through the straight without giving China a phone call asking if they could dock and enjoy the sights of China why they were that way ? Newtons laws about reactions and the world needs to stop these games and become friends , forget history that is the cause of hostility and build a proper future . China is a beautiful country and there should be more tourism , the Chinese should respect that our laws sometimes differ from their laws . I know Dubai isn't China , but giving somebody a decade in jail for CBC oil is bad morals . Laws are the difference in how society interacts .

From a 2018 thread... Orch OR may or may not unfold in science because there won't be any mathematics that frames sentience of mind. Just me. But me has had some wild and exciting cerebral adventures I won't tell you about. I noticed scientist attack Orch OR because it reflects upon eternal soul alive outside neurology that animates neurology. Tegmark is an example. His ridicule of Orch OR isn't about the science, it's about the fear physicists have of 'soul.' They don't want to have soul. But they each do have one. Odd study this is. Tegmark's ridicule of Orch OR hails a thread of intellectual persecution that grew from the authority of the Pope of Newton's day. The Pope said calculus is cool, but should never ever be used to study the human soul or any living thing. That really messed up physics and the hard problem with UFOs influencing consciousness. Among other things in the way of progress to the stars in spite of animal beliefs in science. Science has forgotten that, but the epigenetic proclivity lives on! Tegmark defends the authority of the Pope of Newton's day. Now, why is believing in a mind outside of brain any more foolish that believing in a mind inside a brain?

MoonTanMan! It is easier to notice insights staring me in the face since I don't have a quarter-million-Dollar investment in a Ph.D. I read Wilbert Brockhouse Smith years ago, and dismissed the mention of resonance against the fabric of time. Then I read and swooned for several years over the insights of Frank Znidarsic, EE (studied with NASA on Podkletnov duplications). Then I read that were time bent/perturbed (as a mathematical variable) in the rate time 'flows' that gravity pops out of the equation of inertia (hope that's right, lazy old boy here, love you). Human's don't bend time. Most don't. Smith built a coil that he claims did resonate with the fabric of time. The CIA visited Smith. That's why there is no development today based on retardation of entropy at the quantum level to alter geodesic least-time paths. Smith was Canada's UFO hunter in the 1950-s, sanctioned to hunt and on payroll by the Canadian DOT branch of radio science. Smith detected a UFO, and that shut down the open project. He found it on my the day I was born, actually. So there people! I wish I were people, but once learned, unlearning is more difficult. Make me people. Where was Smith wrong? And of course I've studied this for decades. And some of the synchronicities involved brought me to sobbing hot wet mess of uncontrolled soul-mind readjustment. So, being told a text-book taught one that quantum noise is pure noise and there's no signal within just doesn't have all the experience I can't discuss in prudent trained humans. I love your handle, MoonTanMan!

I wish I could quote on my memory of the article of the Pope's qualification of how calculus and Newton's fame in the King's court was touched by the Pope to exclude biological sciences. I will keep looking, but the information was found long ago... but hard to forget. Another hard-to-forget article was one supporting the Catholic Church's commission by the Pope to the scientist-priest that penned the big bang theory. I looked long for the latter, and yet don't know if the information has been scrubbed from the web due to rising malcontent against superstitious 'science,' or is just buried under billions of search-engine hits. Both were a shocking moment to read, and more shocking to see how sycophantic the scientific community has been to remain socially prudent and funded. At least I can read about the great attractor and inside my head I don't have a wrestling match with common sense that says I should remain allegiant for no scientific reason to the big-bang theory, which is one silly piece of 'science' that is only accepted by scientists not because the scientists are religious (which isn't requiring converts to be even one bit spiritual) but because the scientists must needs have a clean resume in the opinion of all the other people that expect everyone should all always agree there is a superstition that makes scientific evidence. That is a notch below Feynman's identification of a cargo-cult cult science in my surmise of scientific excellence. Scientists are driven by prudence to remain funded. Prudence is driven by social limits. Religion yet sets these limits... some spoken... and many, many burned into the human culture. The odor of burnt flesh wafted across countless villages visited by the Grand Inquisitor, and such demonic practice under sanction of a pope living in his own definition of hell as the grand demon of hate and torture. Humans are superstitious and maintain such fear-based reckoning to ignore common sense over social acceptance. Humans believe our social limits are there by some present dynamic in the now. That does not exist. The dynamic was tortured into the destiny of mankind's self-delusions in the first millennia, and there hasn't been a general population inversion of spoken wisdom since. Rather, we see the religious world acting out in ways so totally non-scientific. And scientists suck up to the enduring dysfunction of human kind. We are infected with the folly of our genetics attempting to be civilized by drawing limits and expressing animal hate in prudent ways. We all host internal fears. Those of us that may believe there is a higher intelligent sentience at work, other than state-sanctioned-religion, have no issue rejecting superstition. But the professional scientist may be hide-bound and incapable of such socially unacceptable and imprudent attitudes of an ancient concept of cruel divinity loving only those who accept divine cruelty against others, but not themselves. Superstition is pathetic, gentle people, yet humans wear the cloak of conformity to a pathetic culture that wonders why aliens don't contact us. An academic institution could not legally stop a union-of-open-minds standing full-stop under legal credence of a union recognized by Federal law (in some countries like the U.S.) I'm not a trained scientist with practice at proper prudent prose. So the above from the heart sounds naturally imprudent not because it hits on points ill-conceived, but because it hits on points that leave us unfulfilled on a life mission that cannot be fulfilled in Earth humanity at the present juncture of individuals searching for a group mind in a runaway society of animalisms and superstitions infecting the uppermost levels of science. Please forgive my crude delivery, but I'm not saying this to be liked, but to embarrass the inner human mind of any reader that oppresses the curiosity of a hungry mind in favor of ill-prudence to support a sick society that has a fear of our own inner light that state religion has tried to extinguish since the moment is was endorsed by a king or emperor. Sadly yours, President of the Sick Puppy Club of Catcliffe (our retirement home), high over a horseshoe bend of Indian Creek Survivor of the 1st Natural Philosophy Alliance --which accepted anyone who claimed to have scientific interest, and after several years had been populated by old scientists that were each bent on proving the Bible is the root of science. Such pathetic levels for such trained humans to fall. Society is the strongest drug known to man.

Such is the mind of imprudence in an inner panic that retorts to a slight against another. Thank you for sharing your opinion of me in public. You made my case in point.

The world leaders may like to point out to China that their economy is over if they go hurting innocent civilians in war games . Their economy will be restricted to their own economy with no export of anything . Don't ask a question then if you don't want answers .

I died in diapers, and don't want to learn to think like normal humans. Thank you. Remember... vote up/down, don't teach hubristic patterns to students by snipping personalities. Is that a spot on your tux?

Good job! I was hoping you would grow a pair and stop personal attacks. But you yet had to levy more attacks before could make a decision. Good job and you made it through, anyway. I will post and delineate each and every one of your hubristic remarks that are against the rules here beginning with the next one and inclusive from the beginning... if you do not pull yourself into order and act with respect. I may start a thread on moderator psychology. Or I may get banned. Make your next move.

Magnetic levitation and the Northern lights disagrees with you . Also a car doing a 180 is not the same as a reversal of polarity . I'm sorry I have to leave this forum , was hoping to find some intelligence here but I was sadly mistaken .

USA can beat in battlefield against both Russia and China 1 vs 1 but if they join it is complicated when it all happens and at the end we all die. The elite just pit country vs country to elimanate the population.

You say you want to find the accelleration of the masses , don't you mean the acceleration of the ''free mass'' ? Also in which direction do you want to apply the acceleration ? Do you want the ''free mass'' to lose grip and recede -ve or do you want the mass to assend +ve ? F=ma2 in this situation remember and also consider Newtons third law if you want to assend . Also remember the Newtons of down force is the same as if it weren't on an incline .