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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 the International System of Units (SI), the unit of measurement of momentum is the kilogram metre per second (kg⋅m/s), which is dimensionally equivalent to the newton-second.
In physics, the twin paradox is a thought experiment in special relativity involving twins, one of whom takes a space voyage at relativistic speeds 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 to understand the paradox is to realize the travelling twin is undergoing acceleration, which makes them 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.
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 law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (emf). This phenomenon, known as electromagnetic induction, 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 a main role in 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 Marar 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.
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.
Neil Affleck is a Canadian animator, director, actor, and teacher. He has worked as an animation-timer and director on The Simpsons and Family Guy. As an actor, he appeared in the 1981 film Scanners and had a leading role in the 1981 film My Bloody Valentine. He also directed animated works such as Family Guy, Miss Spider's Sunny Patch Friends,Mike the Knight, and the 2009 Doki special. He contributed to six episodes of Rocko's Modern Life, five episodes of The Critic, and one full season of Pearlie. Affleck won the Norman McLaren award for his animated film "Hands" while still a student.
Jon Pareles is an American journalist who is the chief popular music critic in the arts section of The New York Times.
Ernst Jakob Henne was a German motorcycle racer and racecar driver.
Stephen Holden is an American writer, poet, and music and film critic.
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.
Classical mechanics is a physical theory describing the motion of objects such as projectiles, parts of machinery, spacecraft, planets, stars, and galaxies. The development of classical mechanics involved substantial change in the methods and philosophy of physics. The qualifier classical distinguishes this type of mechanics from physics developed after the revolutions in physics of the early 20th century, all of which revealed limitations in classical mechanics.
Tropicos is an online botanical database containing taxonomic information on plants, mainly from the Neotropical realm. It is maintained by the Missouri Botanical Garden and was established in 1982. The database contains images and taxonomical and bibliographical data on more than 4.2 million herbarium specimens. In addition, it contains data on over 49,000 scientific publications. The database can be queried in English, French, and Spanish. The oldest records in the database go back to 1703.
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.
Hassan Aourid is a Moroccan writer. He was born in Errachidia. He has a PhD in political science and lectures at the Mohammed V University. He has published widely in both Arabic and French. He has written half a dozen novels:
Professor Sir Michael Oliver McBride is a consultant physician who has served as the Chief Medical Officer for Northern Ireland since September 2006.
References
- ↑ Theresa Bane, Encyclopedia of Beasts and Monsters in Myth, Legend and Folklore, 2016
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