In Newtonian mechanics, momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. If m is an object's mass and v is its velocity, then the object's momentum p is:
In physics, the twin paradox is a thought experiment in special relativity involving identical twins, one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more. This result appears puzzling because each twin sees the other twin as moving, and so, as a consequence of an incorrect and naive application of time dilation and the principle of relativity, each should paradoxically find the other to have aged less. However, this scenario can be resolved within the standard framework of special relativity: the travelling twin's trajectory involves two different inertial frames, one for the outbound journey and one for the inbound journey. Another way of looking at it is to realize the travelling twin is undergoing acceleration, which makes him a non-inertial observer. In both views there is no symmetry between the spacetime paths of the twins. Therefore, the twin paradox is not actually a paradox in the sense of a logical contradiction. There is still debate as to the resolution of the twin paradox.
In physics, equations of motion are equations that describe the behavior of a physical system in terms of its motion as a function of time. More specifically, the equations of motion describe the behavior of a physical system as a set of mathematical functions in terms of dynamic variables. These variables are usually spatial coordinates and time, but may include momentum components. The most general choice are generalized coordinates which can be any convenient variables characteristic of the physical system. The functions are defined in a Euclidean space in classical mechanics, but are replaced by curved spaces in relativity. If the dynamics of a system is known, the equations are the solutions for the differential equations describing the motion of the dynamics.
Émile Gagnan was a French engineer and, in 1943, co-inventor with French Navy diver Jacques-Yves Cousteau of the Aqua-Lung, the diving regulator used for the first Scuba equipment. The demand-valve, or regulator, was designed for regulating gas in gas-generator engines, but was found to be excellent for regulating air-supply under varied pressure conditions. This allowed people to explore the ocean more easily, even though the original purpose was different.
Faraday's law of induction is a basic law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (emf)—a phenomenon known as electromagnetic induction. It is the fundamental operating principle of transformers, inductors, and many types of electric motors, generators and solenoids.
A leading actor, leading actress, or leading man or lady or simply lead, plays the role of the protagonist of a film, television show or play. The word lead may also refer to the largest role in the piece, and leading actor may refer to a person who typically plays such parts or an actor with a respected body of work. Some actors are typecast as leads, but most play the lead in some performances and supporting or character roles in others.
Mattanur Sankarankutty is an Indian percussionist who plays the chenda, Thayambaka, Panchari melam, and Panchavadyam. He was born in Mattanur in Kannur district of Kerala. He was awarded the Kerala Sangeetha Nataka Akademi Award in 1996, the Padma Shri by the Government of India in 2009 and the Sangeet Natak Akademi Award in 2012.
Jim Reardon is an American animator, storyboard artist, screenwriter, and television director. He is best known for his work on the animated TV series The Simpsons. He has directed over 30 episodes of the series and was credited as a supervising director for seasons 9 through 15. He has been described by Ralph Bakshi as "one of the best cartoon writers in the business".
Pavel Golia was a Slovenian poet and playwright.
Mun Bhuridatta was a Thai bhikkhu from Isan region who is credited, along with his mentor, Ajahn Sao Kantasīlo, with establishing the Thai Forest Tradition or "Kammaṭṭhāna tradition" that subsequently spread throughout Thailand and to several countries abroad.
Lallan Prasad Singh ICS was Governor of Assam (1973–80), Manipur, Meghalaya (1973–80), Nagaland (1973–81), and Tripura (1973–80).
Jon Pareles is an American journalist who is the chief popular music critic in the arts section of The New York Times.
Stephen Holden is an American writer, poet, and music and film critic.
Taran Adarsh is an Indian film critic and trade analyst. He is best known for giving trade figures and box office updates on social media, as well as his reviews for Bollywood Hungama.
Jim Bowden is an American technical diver, known as a cave diver and as a deep diver. In 1994 he set a world record, since broken, by diving to 925 feet (282 m). He is one of only thirty-five people who have dived below a depth of 800 feet (240 m) on self-contained breathing apparatus. He has also made six sub-five hundred foot dives.
Zane Radcliffe is an author from Northern Ireland.
Choo Chiat Goh is a Chinese ballet dancer, choreographer, and the founder of the renowned Goh Ballet Academy, Canada, along with his wife Lin Yee.
Syrna was a town of ancient Caria. According to Greek mythology Podalirius, son of Asclepius founded the place. He named it after the Carian princess Syrna, daughter of Damaethus, whom he married her after he first healed her from a serious injury.
Nephelis was a small town of ancient Cilicia, situated, according to Ptolemy, between Antioch and Anemurium; but if, as some suppose, it be the same place as the Zephelium or Zephelion (Ζεφέλιον) mentioned in the Stadiasmus Maris Magni, it ought to be looked for between Selinus and Celenderis. Near the place was a promontory of the same name, where, according to Livy, the fleet of Antiochus the Great was stationed, when, after reducing the towns of Cilicia as far as Selinus, he was engaged in the siege of Coracesium, and where he received the ambassadors of the Rhodians.
The AbC-19 rapid antibody test is an immunological test for COVID-19 exposure developed by the UK Rapid Test Consortium and manufactured by Abingdon Health. It uses a lateral flow test to determine whether a person has IgG antibodies to the SARS-CoV-2 virus that causes COVID-19. The test uses a single drop of blood obtained from a finger prick and yields results in 20 minutes. The sensitivity of this test is 98.03% while the specificity is 99.56%. This test is paired with an easy-to-use mobile app which allows a trained professional to generate an antibody test certificate for storing on a person's smartphone.
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