An elephant and an ant are to be projected out of the earth into space. What is the velocity needed to do so?
Anonymous Quiz
16%
Elephant needs to be projected with a higher velocity
11%
Ant should be projected with a higher velocity
68%
Both should be projected with the same velocity
5%
Elephant cannot be projected to space
If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite orbiting around the earth?
Anonymous Quiz
22%
Time period
27%
Orbiting radius
27%
Areal velocity
23%
Angular velocity
A particle is acted upon by a force of a constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that ___________
Anonymous Quiz
20%
Its velocity is constant and kinetic energy is constant
19%
Its acceleration and velocity is constant
35%
Its kinetic energy is constant and it moves in a circular path
25%
Its acceleration is constant and it moves in a circular path
BREAKING NEWS
The Royal Swedish Academy of Sciences has decided to award the 2022 Nobel Prize in Physics to Alain Aspect, John F. Clauser and Anton Zeilinger “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science.”
Alain Aspect, John Clauser and Anton Zeilinger have each conducted groundbreaking experiments using entangled quantum states, where two particles behave like a single unit even when they are separated. Their results have cleared the way for new technology based upon quantum information.
The ineffable effects of quantum mechanics are starting to find applications. There is now a large field of research that includes quantum computers, quantum networks and secure quantum encrypted communication.
One key factor in this development is how quantum mechanics allows two or more particles to exist in what is called an entangled state. What happens to one of the particles in an entangled pair determines what happens to the other particle, even if they are far apart.
For a long time, the question was whether the correlation was because the particles in an entangled pair contained hidden variables, instructions that tell them which result they should give in an experiment. In the 1960s, John Stewart Bell developed the mathematical inequality that is named after him. This states that if there are hidden variables, the correlation between the results of a large number of measurements will never exceed a certain value. However, quantum mechanics predicts that a certain type of experiment will violate Bell’s inequality, thus resulting in a stronger correlation than would otherwise be possible.
John Clauser developed John Bell’s ideas, leading to a practical experiment. When he took the measurements, they supported quantum mechanics by clearly violating a Bell inequality. This means that quantum mechanics cannot be replaced by a theory that uses hidden variables.
Some loopholes remained after John Clauser’s experiment. Alain Aspect developed the setup, using it in a way that closed an important loophole. He was able to switch the measurement settings after an entangled pair had left its source, so the setting that existed when they were emitted could not affect the result.
Using refined tools and long series of experiments, Anton Zeilinger started to use entangled quantum states. Among other things, his research group has demonstrated a phenomenon called quantum teleportation, which makes it possible to move a quantum state from one particle to one at a distance.
“It has become increasingly clear that a new kind of quantum technology is emerging. We can see that the laureates’ work with entangled states is of great importance, even beyond the fundamental questions about the interpretation of quantum mechanics,” says Anders Irbäck, Chair of the Nobel Committee for Physics.
Learn more
Press release: https://bit.ly/3BLf9gK
Popular information: https://bit.ly/3R3qZYZ
Advanced information: https://bit.ly/3Sa43IS
The Royal Swedish Academy of Sciences has decided to award the 2022 Nobel Prize in Physics to Alain Aspect, John F. Clauser and Anton Zeilinger “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science.”
Alain Aspect, John Clauser and Anton Zeilinger have each conducted groundbreaking experiments using entangled quantum states, where two particles behave like a single unit even when they are separated. Their results have cleared the way for new technology based upon quantum information.
The ineffable effects of quantum mechanics are starting to find applications. There is now a large field of research that includes quantum computers, quantum networks and secure quantum encrypted communication.
One key factor in this development is how quantum mechanics allows two or more particles to exist in what is called an entangled state. What happens to one of the particles in an entangled pair determines what happens to the other particle, even if they are far apart.
For a long time, the question was whether the correlation was because the particles in an entangled pair contained hidden variables, instructions that tell them which result they should give in an experiment. In the 1960s, John Stewart Bell developed the mathematical inequality that is named after him. This states that if there are hidden variables, the correlation between the results of a large number of measurements will never exceed a certain value. However, quantum mechanics predicts that a certain type of experiment will violate Bell’s inequality, thus resulting in a stronger correlation than would otherwise be possible.
John Clauser developed John Bell’s ideas, leading to a practical experiment. When he took the measurements, they supported quantum mechanics by clearly violating a Bell inequality. This means that quantum mechanics cannot be replaced by a theory that uses hidden variables.
Some loopholes remained after John Clauser’s experiment. Alain Aspect developed the setup, using it in a way that closed an important loophole. He was able to switch the measurement settings after an entangled pair had left its source, so the setting that existed when they were emitted could not affect the result.
Using refined tools and long series of experiments, Anton Zeilinger started to use entangled quantum states. Among other things, his research group has demonstrated a phenomenon called quantum teleportation, which makes it possible to move a quantum state from one particle to one at a distance.
“It has become increasingly clear that a new kind of quantum technology is emerging. We can see that the laureates’ work with entangled states is of great importance, even beyond the fundamental questions about the interpretation of quantum mechanics,” says Anders Irbäck, Chair of the Nobel Committee for Physics.
Learn more
Press release: https://bit.ly/3BLf9gK
Popular information: https://bit.ly/3R3qZYZ
Advanced information: https://bit.ly/3Sa43IS
BREAKING NEWS
The Royal Swedish Academy of Sciences has decided to award the 2022 Nobel Prize in Chemistry to Carolyn R. Bertozzi, Morten Meldal and K. Barry Sharpless "for the development of click chemistry and bioorthogonal chemistry."
The Nobel Prize in Chemistry 2022 is about making difficult processes easier. Barry Sharpless and Morten Meldal have laid the foundation for a functional form of chemistry - click chemistry-in which molecular building blocks snap together quickly and efficiently. Carolyn Bertozzi has taken click chemistry to a new dimension and started utilising it in living organisms.
Chemists have long been driven by the desire to build increasingly complicated molecules. In pharmaceutical research, this has often involved artificially recreating natural molecules with medicinal properties. This has led to many admirable molecular constructions, but these are generally time consuming and very expensive to produce.
Barry Sharpless - who is now being awarded his second Nobel
Prize in Chemistry-started the ball rolling. Around the year 2000, he coined the concept of click chemistry, which is a form of simple and reliable chemistry, where reactions occur quickly and unwanted by-products are avoided.
Shortly afterwards, Morten Meldal and Barry Sharpless independently of each other - presented what is now the crown jewel of click chemistry: the copper catalysed azide-alkyne cycloaddition. This is an elegant and efficient chemical reaction that is now in widespread use. Among many other uses, it is utilised in the development of pharmaceuticals, for mapping DNA and creating materials that are more fit for purpose.
Carolyn Bertozzi took click chemistry to a new level. To map important but elusive biomolecules on the surface of cells - glycans - she developed click reactions that work inside living organisms. Her bioorthogonal reactions take place without disrupting the normal chemistry of the cell.
These reactions are now used globally to explore cells and track biological processes. Using bioorthogonal reactions, researchers have improved the targeting of cancer pharmaceuticals, which are now being tested in clinical trials.
Click chemistry and bioorthogonal reactions have taken chemistry into the era of functionalism. This is bringing the greatest benefit to humankind.
Learn more
Press release: https://bit.ly/3R61zku Popular information: https://bit.ly/3r7TQAJ Advanced information: https://bit.ly/3C0F1q6
The Royal Swedish Academy of Sciences has decided to award the 2022 Nobel Prize in Chemistry to Carolyn R. Bertozzi, Morten Meldal and K. Barry Sharpless "for the development of click chemistry and bioorthogonal chemistry."
The Nobel Prize in Chemistry 2022 is about making difficult processes easier. Barry Sharpless and Morten Meldal have laid the foundation for a functional form of chemistry - click chemistry-in which molecular building blocks snap together quickly and efficiently. Carolyn Bertozzi has taken click chemistry to a new dimension and started utilising it in living organisms.
Chemists have long been driven by the desire to build increasingly complicated molecules. In pharmaceutical research, this has often involved artificially recreating natural molecules with medicinal properties. This has led to many admirable molecular constructions, but these are generally time consuming and very expensive to produce.
Barry Sharpless - who is now being awarded his second Nobel
Prize in Chemistry-started the ball rolling. Around the year 2000, he coined the concept of click chemistry, which is a form of simple and reliable chemistry, where reactions occur quickly and unwanted by-products are avoided.
Shortly afterwards, Morten Meldal and Barry Sharpless independently of each other - presented what is now the crown jewel of click chemistry: the copper catalysed azide-alkyne cycloaddition. This is an elegant and efficient chemical reaction that is now in widespread use. Among many other uses, it is utilised in the development of pharmaceuticals, for mapping DNA and creating materials that are more fit for purpose.
Carolyn Bertozzi took click chemistry to a new level. To map important but elusive biomolecules on the surface of cells - glycans - she developed click reactions that work inside living organisms. Her bioorthogonal reactions take place without disrupting the normal chemistry of the cell.
These reactions are now used globally to explore cells and track biological processes. Using bioorthogonal reactions, researchers have improved the targeting of cancer pharmaceuticals, which are now being tested in clinical trials.
Click chemistry and bioorthogonal reactions have taken chemistry into the era of functionalism. This is bringing the greatest benefit to humankind.
Learn more
Press release: https://bit.ly/3R61zku Popular information: https://bit.ly/3r7TQAJ Advanced information: https://bit.ly/3C0F1q6
NobelPrize.org
The Nobel Prize in Chemistry 2022
The Nobel Prize in Chemistry 2022 was awarded jointly to Carolyn R. Bertozzi, Morten Meldal and K. Barry Sharpless "for the development of click chemistry and bioorthogonal chemistry"
A particle of mass 100g is thrown vertically upwards with a speed of 5m/s. The work done by the force of gravity during the time the particle goes up is ___________
Anonymous Quiz
27%
1.25J
33%
0.5J
20%
-0.5J
20%
-1.25J
If mass-energy equivalence is taken into account when water is cooled to form ice, the mass of water should ___________
Anonymous Quiz
21%
Increase
48%
Remain unchanged
20%
Decrease
11%
First increase and then decrease
Forwarded from Cosmology and Quantum Mechanics (Muzamil Nazir Malik)
Do you think anyone could learn physics?
“I don’t know. I know some very smart people whose minds are simply not tuned to physics. I’m a reasonably smart person, but I can’t understand money, finance and economics. As soon as I start to learn about it my brain starts wandering. So I’m not sure my friend Feynman was right when he said anyone could learn physics. Different people have different kinds of minds. I like literature, I read a lot, but I cannot read poetry. Somehow I don’t get poetry. People are wired in different ways; genetic make-ups are different. So I don’t know if anyone could learn physics.”
Leonard Susskind is one of the founding forefathers of string theory.
“I don’t know. I know some very smart people whose minds are simply not tuned to physics. I’m a reasonably smart person, but I can’t understand money, finance and economics. As soon as I start to learn about it my brain starts wandering. So I’m not sure my friend Feynman was right when he said anyone could learn physics. Different people have different kinds of minds. I like literature, I read a lot, but I cannot read poetry. Somehow I don’t get poetry. People are wired in different ways; genetic make-ups are different. So I don’t know if anyone could learn physics.”
Leonard Susskind is one of the founding forefathers of string theory.
Forwarded from Cosmology and Quantum Mechanics
There is gravity on the ISS!
Footage of astronauts on the ISS may give the impression of a gravity-free environment, but onboard gravity is actually only 10-11% weaker than it is on Earth’s surface.
Astronauts float freely due to the ISS’s continual state of free-fall, the same effect experienced by skydivers.
The difference with the ISS is that it also has horizontal motion. As the ISS moves ‘sideways’ and falls towards Earth, the horizon curves away beneath it at the same rate, keeping the ISS in orbit and simulating a feeling of weightlessness for anyone on board.
@thecaqm.
Footage of astronauts on the ISS may give the impression of a gravity-free environment, but onboard gravity is actually only 10-11% weaker than it is on Earth’s surface.
Astronauts float freely due to the ISS’s continual state of free-fall, the same effect experienced by skydivers.
The difference with the ISS is that it also has horizontal motion. As the ISS moves ‘sideways’ and falls towards Earth, the horizon curves away beneath it at the same rate, keeping the ISS in orbit and simulating a feeling of weightlessness for anyone on board.
@thecaqm.
Forwarded from Cosmology and Quantum Mechanics (Muzamil Nazir Malik)
I am interested in the evolution of intelligence for another reason as well. We now have at our command, for the first time in human history, a powerful tool- the large radio telescope-which is capable of communication over immense interstellar distances. We are just beginning to employ it in a halting and tentative manner, but with a perceptibly increasing pace, to determine whether other civilizations on unimaginably distant and exotic worlds may be sending radio messages to us. Both the existence of those other civilizations and the nature of the messages they may be sending depend on the universality of the process of evolution of intelligence that has occurred on Earth. Conceivably, some hints or insights helpful in the quest for extraterrestrial intelligence might be derived from an investigation of the evolution of terrestrial intelligence.
-Carl Sagan, The Dragons of Eden: Speculations on the Evolution of Human Intelligence
-Carl Sagan, The Dragons of Eden: Speculations on the Evolution of Human Intelligence
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Forwarded from Cosmology and Quantum Mechanics (Muzamil Nazir Malik)
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Forwarded from Cosmology and Quantum Mechanics (Muzamil Nazir Malik)
Sciences are divided into two groups - the physics and stamp collecting.
Or you put it this way:
All science is either physics or stamp collecting.
Ernest Rutherford
Or you put it this way:
All science is either physics or stamp collecting.
Ernest Rutherford