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A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell that does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting ...
Pulley's initial lineup included Strung Out drummer Jordan Burns, guitarist Jim Cherry ( former bassist of Strung Out and, later, Zero Down), guitarist Mike Harder, and former Face to Face bassist Matt Riddle. Pulley's debut album, Esteem Driven Engine, was released in 1996 by Epitaph Records.
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A movable pulley is used to transform forces. A movable pulley has a mechanical advantage of 2. That is, if one end of the rope is anchored, pulling on the other end of the rope will apply a doubled force to the object attached to the pulley. Compound A compound pulley is a combination fixed and movable pulley system.
Cleve Andrew Pulley (born May 5, 1951), better known as Andrew Pulley, is a former American politician who ran as Socialist Workers Party (SWP) nominee for Vice President of the United States in 1972 and one of three nominees the party put forth for President of the United States in 1980.
- Coat of arms
- Heritage sites of national significance
Pully is a municipality in Switzerland in the canton of Vaud, located in the district of Lavaux-Oron. It is one of the eastern suburbs of the city of Lausanne, located on the shores of Lake Geneva and at the foot of the vineyards of Lavaux on the road to Vevey and Montreux.
In 1826 a neolithic cemetery with about 30 graves was uncovered at Pierra-Portray. However, the artifacts were not fully preserved and only one flint blade and a soapstone fragment still exist. Near Pierra-Portray, along the Chemin de Chamblandes, Albert Naef examined 23 tombs in
In the 1970s, while working on foundation of a terrace of the Le Prieuré building, the corner of a large Roman era villa was discovered. The villa dates from the period between the second half of the 1st Century and 4th Century AD. The accompanying small thermal baths, a ...
During the Carolingian era the additional buildings were built around the burial chapel. During the Early Middle Ages a cemetery was operating at Les Deserts. In the 10th Century the royal family of Burgundy granted their vineyards at Pully to Payerne Priory. The priory retained
Pully has an area, as of 2009, of 5.85–5.91 square kilometers. Of this area, 1.2 km2 or 20.5% is used for agricultural purposes, while 1.41 km2 or 24.1% is forested. Of the rest of the land, 3.28 km2 or 56.1% is settled, 0.01 km2 or 0.2% is either rivers or lakes and 0.01 km2 or 0.2% is unproductive land. Of the built up area, housing and buildings made up 37.3% and transportation infrastructure made up 13.2%. while parks, green belts and sports fields made up 4.4%. Out of the forested ...
The blazon of the municipal coat of arms is Per pale Argent and Gules, overall a Grape-bunch counterchanged leaved Vert.
Pully has a population of 18,458. As of 2008, 27.3% of the population are resident foreign nationals. Over the last 10 years the population has changed at a rate of 6.8%. It has changed at a rate of 7.3% due to migration and at a rate of -0.2% due to births and deaths.
The Gardens of Villa Eupalinos and the Roman villa at Prieuré are listed as Swiss heritage sites of national significance. The entire urban village of Pully is part of the Inventory of Swiss Heritage Sites.
Elizabeth Rope (neé Pulley) (1762-1837) was a First Fleet convict sentenced in 1783 at Thetford Norfolk to 7 years transportation for theft. She was transported to New South Wales on the Friendship and the Prince of Wales, disembarking in Sydney Cove on 6 February 1788.
- 21 Feb 1762, Felthorpe, Norfolk UK
- Pioneer settler
- 9 Aug 1837, Castlereagh, New South Wales
- Anthony Rope (m. 19 May 1788)
History. The mechanical belt drive, using a pulley machine, was first mentioned in the text the Dictionary of Local Expressions by the Han Dynasty philosopher, poet, and politician Yang Xiong (53–18 BC) in 15 BC, used for a quilling machine that wound silk fibers on to bobbins for weavers' shuttles.
Fixed A fixed or class 1 pulley has a fixed axle. That is, the axle is "fixed" or anchored in place. A fixed pulley is used to redirect the force in a rope (called a beltwhen it goes in a full circ...Movable A movable or class 2pulley has a free axle. That is, the axle is "free" to move in space. A movable pulley is used to transform forces. A movable pulley has a mechanical advantage of two. T...Compound A compound pulley is a combination fixed and movable pulley system.Diagram 1 - A basic equation for a pulley: In equilibrium, the force Fon the pulley axle is equal and opposite to the sum of the tensions in each line leaving the pulley, and these tensions are equal.Diagram 2 - A simple pulley system - a single movable pulley lifting a unit weight. The tension in each line is half the unit weight, yielding an advantage of 2.Diagram 2a - Another simple pulley system similar to diagram 2, but in which the lifting force is redirected downward.A practical compound pulley corresponding to diagram 2a.
- Types of Pulleys
- Theory of Operation
- Uses of Pulleys
- External Links
Pulleys have been used for lifting for thousands of years. The most prevalent and oldest example are their uses on ships and boats. The block and tackle have been a key tool for raising sails and cargo. Another major use for pulleys is with cranes. Pulleys continue to be used in modern times with various machines and systems. Even in the space age, pulleys play an important role in the construction and operations of spacecraft and aircraft. It is with a pulley system that rudders for an aircraft are controlled. In fact, pulleys are commonly used in everyday life, from vehicles to moving equipment.Arnold, Dieter. Building in Egypt: Pharaonic Stone Masonry. Oxford University Press, 1991. ISBN 978-0195063509Delta Education. Levers and Pulleys. Nashua, NH: Delta Education, 2000. ISBN 0875048110Hellman, Harold, Hal Hellman, and Lynn Sweat. The Lever And Pulley. New York, NY: M. Evans and Company, Inc., 1971. ISBN 0871310724Moorey, P.R.S. Ancient Mesopotamian Materials and Industries. Eisenbrauns, 1999. ISBN 978-1575060422
All links retrieved January 13, 2021. 1. How a Block and Tackle Works – How Stuff Works. 2. Pulleys - Explain That Stuff!
- Basic Components
- Types of System
- Lifting Advantage
- Common Examples
Engineers generally talk about “simple machines” in six different categories: inclined planes, levers, screws, wedges, wheel and axels, and pulleys. All are made of basic, everyday components and all make humans’ work simpler in one way or another. Pulleys are usually most concerned with lifting and moving large objects. In its most basic form, this tool consists of little more than a wheel with a groove. A rope, belt, or cable runs inside the groove. That mechanism can be used alone or connected with others in a pulley system. The greater the number of pulleys in the system, the less force it will take to lift the object.
There are three basic types of system: (1) fixed, with a fixed axle; (2) movable, with a free axle; and (3) compound, with a combination of fixed and movable axles Movable and compound axles, by multiplying the force, tend to be more efficient than fixed systems. Wheel-and-rope tools can also be used in combination with other tools for more specific purposes. The so-called “belt and pulley system” is one example. These tend to be “closed” systems in which several grooved wheels are connected by one circular, connected belt, and are designed for the transmissionand amplification of energy rather than straight lifting power.
One of the biggest benefits of this type of machine is the ability to move heavy objects and channel lifting energy without exerting much force. In general, the heavier the object the more force a person must exert to move it. Channeling that energy up a rope and around a wheel — or series of wheels, depending on the weight of the object &madash; can make the overall exertion, which is commonly known as “lifting advantage,” much more efficient. For example, a person will typically need to exert about 10 pounds (4.5 kilograms) of force to lift a 10-pound (4.5-kg) weight, and in most cases that force will need to be applied in a straight upwards motion. If the weight is attached to a pulley, the person will still need to exert the same amount of measured force, but the direction it needs to be exerted in changes. Once attached to the rope system, the person must pull down rather than lift up. This makes more efficient use of the individual’s body weight and exertion. The more wheels t...
These tools can be found in many modern day settings. Elevators are perhaps one of the most common: though they aren’t seen on the outside, large systems of spinning wheels and cables help the cars move up and down. In most cases these are controlled by computers and are lifted through mechanical means rather than manpower, but the efficiency is the same. Many car engines also depend on belted systems to help shuttle energy from the engine to the wheel shafts and other moving parts. Sailboats frequently use them to control tension in the sails, and they're common in cranes and other machinery, too.