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Pendulum Wave
A pendulum wave is an elementary physics demonstration and kinetic art comprising a number of uncoupled simple pendulums with monotonically increasing lengths. As the pendulums oscillate, they appear to produce travelling and standing waves, Beat (acoustics), beating, and random motion.Harvard Natural Sciences Lecture Demonstrations''Pendulum Waves''/ref> History Ernst Mach designed and constructed the first pendulum wave demonstration around 1867 at Charles-Ferdinand University in Prague. In the Czech Republic, the demonstration is called . Eric J. Heller at Harvard University suggested the use of the demonstration to simulate quantum revival. In 2001, two University of Minnesota Morris researchers have derived a continuous function explaining the patterns in the pendulums using an extension to the equation for traveling waves in one dimension, and showed that their cycling arises from aliasing of the underlying continuous function. In 2020, illusionist Kevin McMahon, incorpo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pendulums
A pendulum is a device made of a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing. Pendulums were widely used in early mechanical clocks for timekeeping. The regular motion of pendulums was used for timekeeping and was the world's most accurate timekeeping technology until the 1930s. The pendulum clock invented by Christiaan Huygens in 1656 became the world's standard timekeeper, used in homes and offices for 270 years, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Minnesota Morris
The University of Minnesota Morris (UMN–Morris) is a public liberal arts college in Morris, Minnesota, United States. It is part of the University of Minnesota system and was founded in 1960 as a public, co-educational, residential liberal arts college offering Bachelor of Arts degrees. History Although UMN Morris officially opened its doors in 1960, the history of what became the current institution reaches to 1887. That year, the first building of the Morris Industrial School for Indians, an American Indian boarding school founded by Mother Mary Joseph Lynch, was constructed on the site and run by the Roman Catholic Sisters of Mercy under contract to the US government. Beginning in 1898, the Office of Indian Affairs (today's Bureau of Indian Affairs) took over operations to introduce a more progressive curriculum. The school closed in 1909, under a congressionally authorized program to reduce the number of boarding schools in preference for locating schools on reservati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newton's Cradle
Newton's cradle is a device, usually made of metal, that demonstrates the principles of Momentum, conservation of momentum and conservation of energy in physics with swinging Sphere, spheres. When one sphere at the end is lifted and released, it strikes the stationary spheres, compressing them and thereby transmitting a pressure wave through the stationary spheres, which creates a force that pushes the last sphere upward. The last sphere swings back and strikes the stationary spheres, repeating the effect in the opposite direction. Newton's cradle demonstrates conservation of momentum and energy. The device is named after 17th-century English scientist Isaac Newton, Sir Isaac Newton and was designed by French scientist Edme Mariotte. It is also known as Newton's pendulum, Newton's balls, Newton's rocker or executive ball clicker (since the device makes a click each time the balls collide, which they do repeatedly in a steady rhythm). Operation When one of the balls at the e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Standard Gravity
The standard acceleration of gravity or standard acceleration of free fall, often called simply standard gravity and denoted by or , is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is a constant defined by standard as . This value was established by the third General Conference on Weights and Measures (1901, CR 70) and used to define the standard weight of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration from the rotation of the Earth (but the latter is small enough to be negligible for most purposes); the total (the apparent gravity) is about 0.5% greater at the poles than at the Equator. Although the symbol is sometimes used for standard gravity, (without a suffix) can also mean the local acceleration due to local gravity and centrifugal acceleration, which varies depending on on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency
Frequency is the number of occurrences of a repeating event per unit of time. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light. The interval of time between events is called the period. It is the reciprocal of the frequency. For example, if a heart beats at a frequency of 120 times per minute (2 hertz), its period is one half of a second. Special definitions of frequency are used in certain contexts, such as the angular frequency in rotational or cyclical properties, when the rate of angular progress is measured. Spatial frequency is defined for properties that vary or cccur repeatedly in geometry or space. The unit of measurement of frequency in the International System of Units (SI) is the hertz, having the symbol Hz. Definitions and units For cyclical phenomena such as oscillations, waves, or for examp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ivo Schoofs, Large Pendulum Wave, 2017 (32259504263)
Ivo is a masculine given name, in use in various European languages. The name used in western European languages originates as a Normannic name recorded since the High Middle Ages, and the French name Yves is a variant of it. The unrelated South Slavic name is a variant of the name Ivan (John). Origins The name is recorded from the High Middle Ages among the Normans of France and England ( Yvo of Chartres, born c. 1040). The name's etymology may be either Germanic or Celtic, in either case deriving from a given name with a first element meaning "yew" (Gaulish ''Ivo-'', Germanic ''Iwa-'').Campbell, MikIvo(Behind the Name: The Etymology and History of First Names) The name may have been spread by the cult of Saint Ivo (d. 1303), patron saint of Brittany. The Slavic name is a hypocorism, like its variant '' Ivica''. In Croatia, the name exhibits both Slavic and Celtic-Germanic origins; the Slavic variant Ivona of the Celtic-origin feminine name Yvonne, is regular and fairl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Britain's Got Talent (series 14)
The fourteenth series of British talent competition programme '' Britain's Got Talent'' was broadcast on ITV, but in two parts as a result of the COVID-19 pandemic in the United Kingdom during that year which affected production on the programme. The first half consisted of audition episodes that had already been filmed, which were aired between 11 April to 30 May 2020. The second half consisted of the remaining episodes when production could resume, and were aired between 30 August to 10 October 2020. The series was notable for Simon Cowell's absence from the semi-finals and final after he sustained an injury following an accident in August, forcing him to be replaced by Ashley Banjo. He still appeared in the audition episodes as they had been filmed and aired before his injury. Before Cowell's injury, it was intended for him to be virtually present for the semi-finals because of travel restrictions and his commitments to '' America's Got Talent''. The semi-finals and the fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cannonball
A round shot (also called solid shot or simply ball) is a solid spherical projectile without explosive charge, launched from a gun. Its diameter is slightly less than the bore of the barrel from which it is shot. A round shot fired from a large-caliber gun is also called a cannonball. The cast iron cannonball was introduced by French artillery engineers after 1450; it had the capacity to reduce traditional English castle wall fortifications to rubble. French armories would cast a tubular cannon body in a single piece, and cannonballs took the shape of a sphere initially made from stone material. Advances in gunpowder manufacturing soon led the replacement of stone cannonballs with cast iron ones. Round shot was made in early times from dressed stone, referred to as gunstone (Middle English: ''gunneston''), but by the 17th century, from iron. It was used as the most accurate projectile that could be fired by a smoothbore cannon, used to batter the wooden hulls of oppos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
