The more work and calculations that need to be done, the better. It's tempting to say that the universe must be full of dark clouds of dust or dead stars and be done with it, but there are persuasive arguments that this is not the case. Electricity (AQA) questions - part 2. The. “There are basic facts about the universe that we’re ignorant of,” says Dr. Daniel Whiteson, a University of California physicist and the co-author of the new book "We Have No Idea: A Guide to the Unknown Universe. Maybe, But Not in the Quantum Realm, How Astronomers Learned to ‘Listen’ to Gravitational Waves. 0.200 kg stone rests on a frictionless, horizontal surface. Sand is one example. Answer Questions. The first set (Set number 1) is being published on this post body itself and the rest of the sets (6 more) are being embedded in a pdf file, which is also available right on this page for you. 5 3 customer reviews. The original string-theory model of the universe combines gravity with the other three forces in a complex 11-dimensional world. Astronomers cannot see all the way back in time to the origin of the universe, but by drawing on lots of clues and theory, they can imagine how everything began. Some answers may come when the Deep Underground Neutrino Experiment (DUNE) starts collecting data in 2026. For example, near the heart of a black hole, where huge amounts of matter are squeezed into quantum spaces, gravitational forces become very powerful at tiny distances. This page is a good resource for students who want good quality problems to practice with when studying for tests and exams. But Einstein's theories do not pay any attention to quantum mechanics, the realm of the extremely small, because gravitational forces are negligible at small scales, and discrete packets of gravity, unlike discrete packets of energy that hold atoms together, have never been experimentally observed. No force is more familiar than gravity — it’s what keeps our feet on the ground, after all. If you are u… AS - Electricity. Forces and motion (AQA) questions - part 1. Atoms are known to be electrically neutral — the positive charge of the protons is cancelled out by the negative charge of the electrons — but as to why this is so, Lincoln says, “Nobody knows.”. How many parliamentary seats are returned to the UK Houses of Parliament? Although vacuum energy in outer space was pumped into it by the weird rules of quantum mechanics, not by someone pulling on a plunger, this example illustrates how repulsion can be created by a negative pressure. All questions are set primarily by topic, not by paper. Here we are publishing a large number of physics problems and questions, with selective hints as well. Their model starts with the entire universe as a very hot dot, much smaller than the diameter of an atom. For several decades now, that weak radiation measured the same wherever astronomers looked at the edges of the universe. Here's What Will, How Algorithms Are Driving Us Into the Future. Recently astronomers have pinned down the location of the bursts and tentatively identified them as massive supernova explosions and neutron stars colliding both with themselves and black holes. But once he was up to speed, Newton would no doubt applaud what modern physics has achieved — from the discovery of the nature of light in the 19th Century to determining the structure of the atom in the 20th Century to last year’s discovery of gravitational waves. Solids and liquids are well understood. Physicists, using linear and circular particle accelerators as their high-resolution "microscopes," study pieces of atoms so small they can't be seen. And that little ‘one’ is the mass that makes up us.”, But why the slight excess of matter over antimatter in the first place? Armature. All the extra questions you need to take the separate Physics GCSE are in the Triple science 'Physics GCSE' sections. But nobody has woven together the tiny world of quantum mechanics and the big world we see when we look through a telescope. 5 Unanswered Questions that Will Keep Physicists Awake at Night. “And the matter and the antimatter annihilated the 10 billion, leaving the one. Hardest physics question ever? To get to that place, we might first wonder if nature is, in fact, schizophrenic: Should we accept that there are two kinds of forces that operate over two different scales — gravity for big scales like galaxies, the other three forces for the tiny world of atoms? Consider a simple analogy: If you pull back on a sealed plunger in an empty, airtight vessel, you'll create a near vacuum. Author: Created by pkScienceAndMaths. ... The-10-Hardest-Questions-in-P2. But even now nobody knows much about what goes on when so much energy is flying around. I made a similar thread for O Levels (the link is in my signature). The most massive stars sometimes exploded in energetic supernovas that produced even heavier elements, up to and including iron. At first glance, you'd be forgiven for thinking these physicists had experienced some sort of mental decay on the grounds that tiny quarks are unlikely to give birth to behemoth bosons weighing more than 10,000,000,000,000,000 times themselves. But neither string theory or loop quantum gravity has been tested experimentally. It details 11 profound questions, some of which may be answered within a decade. Comparing notes, they realize it's the same alligator. Perhaps current theories simply aren't adequate to explain them. “To me,” he says, “the deepest part of the question is, why is time so different from space?” (Recent computer simulations seem to show how the asymmetry of time might arise from the fundamental laws of physics, but the work is controversial, and the ultimate nature of time continues to stir passionate debate.). In that world — our world — seven of the dimensions are wrapped up on themselves in unimaginably small regions that escape our notice. Electricity (AQA) questions - part 1. Multiple choice exam questions organised by topic with model answers for the CIE IGCSE Physics 9-1 (0972) / A*-G (0625) syllabus. Quantum theory says virtual particles can pop into existence for the briefest of moments before returning to nothingness. These new forces would be added to the three forces that are already known to regulate the behavior of quarks. AQA GCSE Physics Revision. As these come together, physicists realize they are getting very close to a single "theory of everything" that accounts for the fundamental workings of nature, the long-sought unified field theory. Written by Dr. Christopher S. Baird. In case you're worried that the protons you're made of will disintegrate, transforming you into a puddle of elementary particles and free energy, don't sweat it. Sign up for our email newsletter for the latest science news. “It doesn’t explain why the Higgs boson exists. Any such evidence would also help validate theories that seek to find a common description of three of the four natural forces — electromagnetism, strong force, and weak force. “It’s very counterintuitive,” she says. Gravity — the weakest of the forces but the only one that acts cumulatively across long distances — gradually took control, gathering gas and dust into massive globs that collapsed in on themselves until fusion reactions were ignited and the first stars were born. Hardest physics question ever!? If they exist, they will allow quarks to change into other particles, causing the protons that lie at the heart of every atom to decay. And highway traffic can behave in a similar way, flowing freely until it becomes blocked at some bottleneck. 1 5. max m. Lv 6. Scientists suspect some sources: the Big Bang itself, shock waves from supernovas collapsing into black holes, and matter accelerated as it is sucked into massive black holes at the centers of galaxies. Hardest section in A2 Physics (AQA) G495 28th June 2016 - PRE RELEASE! These numerical problems and questions are distributed among 7 sets of Questions for you. World's Hardest Science Quiz You'll Ever Take! At much larger scales, gravity pulled together huge regions of denser-than-average gas. In fact, physicists have already shown the underlying unity between electromagnetism and the weak force. Any errors or mistakes please let us know. Was the entropy of the universe unusually low 14 billion years ago, when the Big Bang brought it into existence? Apologies.]. MIT physicist Dr. Jeremy England recently put forward a theory that attempts to explain the origin of life in terms of fundamental principles of physics. This release does not connect in any obvious way to the states of matter and energy that were earlier sucked into that black hole and therefore violates a law of quantum physics stipulating that all events must be traceable to previous events. Here's a tale of modern physics: Two scientists work at the same university in different fields. One studies huge objects far from Earth. Snell's Law. One possibility is that you are looking for the physics exam with the highest requirement of physics knowledge. More recently, some scientists have speculated that at least some of the heaviest elements, such as gold and lead, are formed in even more powerful blasts that occur when two neutron stars — tiny, burned-out stellar corpses — collide and collapse into a black hole. To satisfy their curiosities, one builds the world's most powerful telescope, and the other builds the world's best microscope. Throw in the added factor of magnetism, and physicists can make only rough guesses about what happens in these hellish settings. In quantum mechanics, events unfold against a fixed backdrop of spacetime — while in general relativity, spacetime itself is flexible. Yet almost everything we see around us, from the ground beneath our feet to the most remote galaxies, is made of ordinary matter. Things that were deeply mysterious a few centuries ago are now taught in freshman physics classes (the composition of stars is one good example). According to current physics ideas, energy in the early universe should have produced an equal mix of matter and antimatter, which would later annihilate each other. At first, the plunger will offer little resistance, but the farther you pull, the greater the vacuum and the more the plunger will pull back against you. All the ordinary matter we can find accounts for only about 4 percent of the universe. “If you can tell me why the early universe had a low entropy, then I can explain the rest of it,” he says. Over the eons fusion reactions inside stars transformed hydrogen and helium into other atomic nuclei, including carbon, the basis for all life on Earth. And yet physicists today are the first to admit they don’t have all the answers. However, many physicists believe that if the three atomic forces are really just different manifestations of a single unified field, the alchemical, supermassive bosons described above will materialize out of quarks every now and then, causing quarks, and the protons they compose, to degenerate. The most energetic particles that strike us from space, which include neutrinos as well as gamma-ray photons and various other bits of subatomic shrapnel, are called cosmic rays. Full coverage of physics revision questions for the 2018 onwards syllabus. “It could be that gravity is as strong as these other forces but that it gets rapidly diluted by spilling out into these other invisible dimensions,” says Whiteson. Astronomers, using a dozen or so new supersize telescopes, also study the same tiny particles, but theirs are waiting for them in space. For 300,000 years, this soup stayed too hot for electrons to bind to the nuclei and form complete atoms. Physics Questions - Real World Physics Problems hard-physics-questions-and-answers 1/15 Downloaded from dev.horsensleksikon.dk on November 17, 2020 by guest [Book] Hard Physics Questions And Answers Recognizing the pretension ways to get this book hard physics questions and answers is additionally useful. One way to get your mind around these extra dimensions is to visualize a single strand of a spiderweb. Entropy may be rising now because it was lower earlier, but why was it low to begin with? Oh and make the given information as small as possible, so it would be even harder. That, in turn, reveals the total mass density of the universe. Not long ago, physicists thought neutrinos were massless, but recent advances indicate that these particles may have a small mass. When Einstein improved on Newton's theory, he extended the concept of gravity by taking into account both extremely large gravitational fields and objects moving at velocities close to the speed of light. Recent computer simulations, however, may be lending support to it. Next there's the matter of gravity, the odd force out when it comes to small particles and the energy that holds them together. While warp drive is pure fiction, antimatter is very real. If Isaac Newton suddenly popped out of a time machine, he’d be delighted to see how far physics had come. Earlier this month, news broke of progress on this 82-year-old question, thanks to prolific mathematician Terence Tao. For some physicists, including Caltech’s Sean Carroll, that’s the missing piece of the puzzle. On the original Star Trek, antimatter reacts with ordinary matter to power the warp drive that propels the U.S.S. The first line of evidence for this mystery component comes from measurements of the geometry of the universe. The last particle to be found this way was the Higgs boson, which LHC researchers discovered in 2012. Study.com has answers to your toughest physics homework questions with detailed, step by step explanations. What’s going on? Fortunately, we live in the age of information, with answers just a few clicks away. Fortunately, the primordial universe left behind a few clues. We may never see these extra dimensions directly, but we may be able to detect evidence of their existence with the instruments of astronomers and particle physicists. You should also check physics GK questions, Biology Gk Questions and General Science GK questions for better practice of competitive exams. The dot began to expand faster than the speed of light, an expansion called the Big Bang. Antimatter may be more famous in fiction than in real life. This inquisitive nature passes by all too quickly. The same must have been true in the dense primordial universe around the time of the Big Bang. Various observations and experiments show that protons must be stable for at least a billion trillion trillion years. 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