The same phenomenon results in extremely fast spin of compact stars ( like white dwarfs, neutron stars and black holes ) when they are formed out of much larger and slower rotating stars ( indeed, decreasing the size of object 10 < sup > 4 </ sup > times results in increase of its angular velocity by the factor 10 < sup > 8 </ sup >).

In 1963, Roy Kerr found the exact solution for a rotating black hole.

Two years later, Ezra Newman found the axisymmetric solution for a black hole that is both rotating and electrically charged.

Charged black holes are described by the Reissner – Nordström metric, while the Kerr metric describes a rotating black hole.

The team also started rotating black pants and debuted an alternate orange jersey.

From concepts drawn of rotating black holes, it is shown that a singularity, spinning rapidly, can become a ring-shaped object.

Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole.

The most widely accepted mechanism for the origin of long-duration GRBs is the collapsar model, in which the core of an extremely massive, low-metallicity, rapidly rotating star collapses into a black hole in the final stages of its evolution.

Another type of singularity predicted by general relativity is inside a black hole: any star collapsing beyond a certain point ( the Schwarzschild radius ) would form a black hole, inside which a singularity ( covered by an event horizon ) would be formed, as all the matter would flow into a certain point ( or a circular line, if the black hole is rotating ).

A rotating black hole might provide additional assistance, if its spin axis is aligned the right way.

Hawking's work followed his visit to Moscow in 1973 where Soviet scientists Yakov Zeldovich and Alexei Starobinsky showed him that according to the quantum mechanical uncertainty principle, rotating black holes should create and emit particles.

* According to a 1992 paper, a computer operating in a Malament-Hogarth spacetime or in orbit around a rotating black hole could theoretically perform non-Turing computations.

However, each part of the accretion disk has a different velocity relative to our line of sight, and the faster the gas is rotating around the black hole, the broader the line will be.

If these stars are rotating slowly then they will produce a faint supernova, but if the star is rotating quickly enough then the fallback to the black hole will produce relativistic jets.

This was replaced in the early 1960s with a white rotating star against a black background against a drumroll jingle.

* the Kerr vacuum ( which models a rotating uncharged black hole )

* the interior of a rotating BTZ black hole

Space-like singularities are a feature of non-rotating uncharged black-holes, while time-like singularities are those that occur in charged or rotating black hole exact solutions.

It is still an open question whether time-like singularities ever occur in the interior of real charged or rotating black holes, or whether they are artifacts of high symmetry and turn into spacelike singularities when realistic perturbations are added.

The lock could be integral to the phone itself or a separate device inserted through the finger hole nearest the finger stop to prevent the dial rotating.

As an image was focused on the rotating disk, each hole captured a horizontal " slice " of the whole image.

The end of the shaft usually has a square hole made to fit certain sized auger bits or a simple triangular bit made to cut while rotating in both directions.

After demonstrating a prototype ( a rotating baffle in a hole in a small closet with a big speaker in the closet near Leslie's home organ ) with Bob Mitchell, an organist with radio station KFI in Los Angeles, a contract was made to install another prototype in the station's studios, where Mitchell would be the only organist authorized to use it.

Some mechanical sharpeners have a large hole with a rotating disk in front of it that has several holes of different sizes.

* Monster Drop, a rotating wheel with holes throughout with various values of tickets tied to the hole.

) The mathematical proof starts with a standard Kerr-Newman rotating black hole solution of general relativity, and it computes the non-zero time-like translation that occurs when you parallel-translate an affine frame ( keeping track of translation as well as rotation ) around an equatorial loop near the black hole.

Isaac Newton's rotating bucket argument ( also known as " Newton's bucket ") was designed to demonstrate that true rotational motion cannot be defined as the relative rotation of the body with respect to the immediately surrounding bodies.

It also merged the Council's High Representative with the Commission's foreign policy head, with this new figure chairing the foreign affair's Council rather than the rotating presidency.

However, a rotating frame can be treated as if it were an inertial frame so that Newton's laws can be used if so-called fictitious forces ( also known as inertial or pseudo-forces ) are included in the sum of external forces on an object.

Disk storage or disc storage is a general category of storage mechanisms, in which data are digitally recorded by various electronic, magnetic, optical, or mechanical methods on a surface layer deposited of one or more planar, round and rotating disks ( or discs ) ( also referred to as the media ).

A downside of this method is that an object rotating at an integer multiple of the strobing frequency will also appear stationary.

The principle of coupled magnetic fluxes between a stationary and a rotating inductor coil is also used to produce mechanical torque in induction motors, which are widely used in appliances and industry.

When a body at these points is perturbed, it moves away from the point, but the factor opposite of that which is increased or decreased by the perturbation ( either gravity or angular momentum-induced speed ) will also increase or decrease, bending the object's path into a stable, kidney-bean-shaped orbit around the point ( as seen in the rotating frame of reference ).

As each round is fired, electrically, the carriage moves back rotating the chamber which also ejects the spent case, indexes the next live round to be fired with the barrel and loads the next round into the chamber.

It should also be noted that rotating the word NIM by 180 degrees results in WIN ( see Ambigram ).

Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another.

Edison's early patents show that he also considered the idea that sound could be recorded as a spiral onto a disc, but Edison concentrated his efforts on cylinders, since the groove on the outside of a rotating cylinder provides a constant velocity to the stylus in the groove, which Edison considered more " scientifically correct ".

A reciprocating engine, also often known as a piston engine, is a heat engine that uses one or more reciprocating pistons to convert pressure into a rotating motion.

The rotating mass of the engine also had a significant gyroscopic precession: depending on the type of aircraft, this produced stability and control problems, especially for inexperienced pilots.

In 1904 the Barry engine, also designed by Redrup, was built in Wales: a rotating 2-cylinder boxer engine weighing 6. 5 kg was mounted inside a motorcycle frame.

A sphere can also be defined as the surface formed by rotating a circle about any diameter.

Kingsbury Hall at the Presidents Circle is a center for the performing artsLower campus is also home to most public venues, such as the Rice – Eccles Stadium, the Jon M. Huntsman Center, the Utah Museum of Natural History, and the Utah Museum of Fine Arts, a museum with rotating exhibitions and a permanent collection of American, European, African, and Asian art.

* Momentum transfer pumps, also called molecular pumps, use high speed jets of dense fluid or high speed rotating blades to knock gas molecules out of the chamber.

SEAL Teams 3 and 8 also began rotating into Oman from the United States and staging on the island of Masirah for operations in Afghanistan.

This delay between phases has the effect of giving constant power transfer over each cycle of the current and also makes it possible to produce a rotating magnetic field in an electric motor.

However, this evolution also demanded more of the skiers effort to be put into rotating the skis onto edge, as opposed to forcing them to rotate tip in or out.

He later changed technique, using a surgical instrument called a leucotome that cut brain tissue by rotating a retractable wire loop ( a quite different cutting instrument also used for lobotomies shares the same name ).

The Windmill girls also toured other London and provincial theatres, sometimes using ingenious devices such as rotating ropes to move their bodies round, though strictly speaking, staying within the letter of the law by not moving of their own volition.

His machine did, in fact, have a rotating brush like a traditional carpet sweeper, and also possessed an elaborate bellows mechanism on top of the body to generate suction of dust and dirt.

It also featured two retractable / rotating artillery turrets as well as four field guns firing from side bunkers (" Casemates de Bourges ") and two retractable twin Hotchkiss machine gun turrets.