Angular momentum is the rotational analog of linear momentum. It is an important physical quantity because it is a conserved quantity – the total angular momentum of a closed system remains constant. Angular momentum has both a direction and a magnitude, and both are conserved. Bicycles and motorcycles, flying discs, rifled bullets, and gyroscopes owe their useful properties to conservation of angular momentum. Conservation of angular momentum is also why hurricanes form spirals and neutron stars have high rotational rates. In general, conservation limits the possible motion of a system, but it does not uniquely determine it.
Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. Electric charge can be positive or negative. Like charges repel each other and unlike charges attract each other. An object with no net charge is referred to as electrically neutral. Early knowledge of how charged substances interact is now called classical electrodynamics, and is still accurate for problems that do not require consideration of quantum effects.
In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects, such as how different observers perceive where and when events occur.
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.
Thomas Edward Lawrence was a British Army officer, archaeologist, diplomat and writer known for his role during the Arab Revolt and Sinai and Palestine campaign against the Ottoman Empire in the First World War. The breadth and variety of his activities and associations, and Lawrence's ability to describe them vividly in writing, earned him international fame as Lawrence of Arabia, a title used for the 1962 film based on his wartime activities.
Roe v. Wade, 410 U.S. 113 (1973), was a landmark decision of the U.S. Supreme Court in which the Court ruled that the Constitution of the United States protected a right to have an abortion. The decision struck down many abortion laws, and it sparked an ongoing abortion debate in the United States about whether, or to what extent, abortion should be legal, who should decide the legality of abortion, and what the role of moral and religious views in the political sphere should be. The decision also shaped debate concerning which methods the Supreme Court should use in constitutional adjudication.
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air is about 343 m/s, or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a sound wave is propagating.
Sexual fetishism or erotic fetishism is a sexual fixation on a body part. The object of interest is called the fetish; the person who has a fetish is a fetishist. A sexual fetish may be regarded as a mental disorder if it causes significant psychosocial distress for the person or has detrimental effects on important areas of their life. Sexual arousal from a particular body part can be further classified as partialism.
Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Separated objects attract and are attracted as if all their mass were concentrated at their centers. The publication of the law has become known as the "first great unification", as it marked the unification of the previously described phenomena of gravity on Earth with known astronomical behaviors.
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.
Elymas, also known as Bar-Jesus, is a Jew described in the Acts of the Apostles, chapter 13, in the New Testament. He is referred to as a mágos (μάγος), which the King James Bible translates as "sorcerer" and false prophet (ψευδοπροφήτης).
Pavel Golia was a Slovenian poet and playwright.
Lesbœufs is a commune in the Somme department in Hauts-de-France in northern France.
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.
Nikolas Tombazis is a racing car designer who has worked in Formula One since 1992 for the Benetton, McLaren, and Ferrari teams.
Devi Lal Samar was an Indian puppeteer who was the founder-director of a folk-theatre museum called the Bharatiya Lok Kala Mandal in Udaipur, Rajasthan. He was awarded Padma Shri for his outstanding work. He wrote several books in Hindi about Rajasthani theatre and puppetry.
Neferkare VII was the third pharaoh of the Ninth Dynasty of Egypt of ancient Egypt, ca. 2140 BCE, according to the Turin King List where his name, Neferkare, is inscribed in the register 4.20.
Vanguard is a Nigerian daily published by Vanguard Media, headquartered in Lagos, Nigeria. Vanguard Media was established in 1984 by journalist Sam Amuka-Pemu and three friends. The paper currently has an online edition.
Richard T. Drinnon was professor emeritus of history at Bucknell University. He also taught at the University of California, Berkeley, where he taught courses on American history. He was denied tenure due to his political activism and was about to be called up by the House Un-American Activities Committee. Drinnon participated in the Columbia University protests of 1968, and he published several books, including "Rebel in Paradise: A Biography of Emma Goldman" and "Facing West: The Metaphysics of Indian-Hating and Empire-Building."
Makarakkoythu is one of the famous poetic collection by Malayalam writer Vyloppilli Sreedhara Menon. It is collection consists of eighty poems about the culture of Kerala. It was published in 1980.
