What is "pendulum"

Hydrometer \Hy*drom"e*ter\, n. [Hydro-, 1 + -meter: cf. F. hydrom[`e]tre.]

1. (Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc.

   Note: It is usually made of glass with a graduated stem, and indicates the specific gravity of a liquid by the depth to which it sinks in it, the zero of the scale marking the depth to which it sinks in pure water. Extra weights are sometimes used to adapt the scale to liquids of different densities.

2. An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.

1660, from Modern Latin pendulum (1643), noun use of neuter of Latin adjective pendulus "hanging down," from pendere "to hang" (see pendant). The Modern Latin word is perhaps a Latinization of Italian pendolo.

n. A body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks.

n. an apparatus consisting of an object mounted so that it swings freely under the influence of gravity

A pendulum is 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 combined with 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.

From the first scientific investigations of the pendulum around 1602 by Galileo Galilei, 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 Christian Huygens in 1658 became the world's standard timekeeper, used in homes and offices for 270 years, and achieved accuracy of about one second per year before it was superseded as a time standard by quartz clocks in the 1930s. Pendulums are also used in scientific instruments such as accelerometers and seismometers. Historically they were used as gravimeters to measure the acceleration of gravity in geophysical surveys, and even as a standard of length. The word "pendulum" is new Latin, from the Latin pendulus, meaning 'hanging'.

The simple gravity pendulum is an idealized mathematical model of a pendulum. This is a weight (or bob) on the end of a massless cord suspended from a pivot, without friction. When given an initial push, it will swing back and forth at a constant amplitude. Real pendulums are subject to friction and air drag, so the amplitude of their swings declines.

A pendulum is a body suspended from a fixed support so that it swings freely back and forth under the influence of gravity.

Pendulum may also refer to:

The mathematics of pendulums are in general quite complicated. Simplifying assumptions can be made, which in the case of a simple pendulum allows the equations of motion to be solved analytically for small-angle oscillations.

Pendulum is the debut EP from Brisbane musician Tara Simmons.

It features the single " Everybody Loves You" which received airplay on Triple J and a nomination in the Q Song Awards in 2006. " Everybody Loves You" and " Break The Rules For Me" were both featured in the independent film All My Friends Are Leaving Brisbane. Only the former was included on the soundtrack album.

Pendulum is a solo album by German double bassist and composer Eberhard Weber recorded in 1993 and released on the ECM label. Weber uses overdubbing and an echo unit to enhance the sound of his bass.

"Pendulum" is a song by English singer FKA Twigs from her debut studio album, LP1 (2014). The song was released digitally on 30 July 2014 as the album's second single. It was also released on 12-inch vinyl the day before, serving as the B-side to " Two Weeks". "Pendulum" premiered on Zane Lowe's BBC Radio 1 show on 29 July 2014. Upon its premiere, Twigs referred to the track as "one of my favourite songs on my record."

Pendulum is the sixth studio album by American rock band Creedence Clearwater Revival, released by Fantasy Records on December 7, 1970—their second album release of that year. A single from the album, " Have You Ever Seen the Rain?"/"Hey Tonight", was released in January 1971.

Pendulum is their only album to not contain any cover songs; all tracks were written by John Fogerty. It was the last album the band did with Tom Fogerty, who would leave the band to start a solo career. It was also the last album to feature John Fogerty as the record's sole producer.

The most sonically adventurous CCR album, Pendulum is noted for its widespread use of horns and keyboards, in contrast to the group's previous albums, which were dominated by guitar. Among several lesser-known Fogerty songs ("Pagan Baby", "Sailor's Lament", "It's Just a Thought", "Born to Move") were two top-ten hits, "Hey Tonight" and "Have You Ever Seen the Rain?". Both songs reached number eight in 1971. It also contains their only avant-garde venture, "Rude Awakening #2".

Pendulum is an EP by British electronica band Broadcast, released in 2003. It preceded the release of the full-length album Haha Sound; the title track "Pendulum" is the only song from the EP to also feature on that album, though several other tracks from this EP were later included on the 2006 rarities compilation The Future Crayon.

The Pendulum EP was the band's last EP release as a five-piece line-up; shortly after the tour promoting Haha Sound, Broadcast shrank to a vocalist/multi-instrumentalist duo, except for tours promoting their follow up Tender Buttons, which featured the band playing as a four piece line-up.

Pendulum is an Australian drum and bass and electronic rock band founded in 2002. Pendulum originally formed in the Australian city of Perth, Western Australia by Rob Swire, Gareth McGrillen, and Paul "El Hornet" Harding. The band was later expanded to include members, Ben Mount, Peredur ap Gwynedd, and KJ Sawka. Members Swire and McGrillen also formed the electro house duo Knife Party. The group is notable for its distinctive sound, mixing hard rock with electronic music and covering a wide range of genres.

After forming Pendulum with Paul Harding, the band relocated to the United Kingdom in 2003. The debut studio album, Hold Your Colour, was released in 2005 to positive critical reception. While Hold Your Colour was mostly of the drum and bass genre, the succeeding albums In Silico and Immersion saw experimentation of other genres such as industrial rock and electronic rock.

In August 2013, Swire announced that a new album may be released in 2014, although Swire and McGrillen later confessed on their Reddit AMA that they had become disillusioned with Pendulum and have no interest at present in producing any new material. Despite this, on March 20, 2016, Pendulum reunited to perform at the Ultra Music Festival in Miami, Florida, marking their official return as a live band.

Pendulum was an ambient house band active from 1994 - 1997. The group formed in Melbourne, Australia in 1994.

Pendulum was a partnership between two Melbourne DJs Noel M and Julian W. They released their first single in 1995 with " I Need You", which reached #1 in Australian Dance charts within three weeks after its release. After its success, Pendulum released " Awesome Party/Insecurity" the following year in 1996. The song was a minor hit compared to "I Need You". In 1997, " Coma" was released proving to be their biggest hit, appearing on the Triple J Hottest 100, 1997 and peaking at #32 on the chart. Extensive support from English and European DJs including Pete Tong and Sasha gave this song international recognition. Shortly after that release, their only album 3 Knocks was released, which featured all the above singles, new songs, and remixes on two discs. This album was for some time Australia's highest selling Independent release.

After the release of 3 Knocks, the group disbanded in early 1998 to pursue other interests. In 2011 these two producers came together under the name Inauditus, an electronic music project.

"Now" is the first Inauditus release which includes previously unreleased material collected over the last 10 years. It is a six track release featuring the single Receiver.

Pendulum is a 1969 film starring George Peppard.

It was the first feature directed by experienced TV director George Schaefer.

The pendulum was an instrument of torture and execution claimed to have been used by the Spanish Inquisition as recently as the early 19th Century. The allegation is contained in the book ''The history of the Inquisition of Spain '' (1826) by the Spanish priest, historian and liberal activist Juan Antonio Llorente. A swinging pendulum whose edge is a knife blade slowly descends toward a bound prisoner until it cuts into his body. The method of torture came to popular consciousness through the 1842 short story " The Pit and the Pendulum" by American author Edgar Allan Poe but there is considerable skepticism that it actually was used.