We use orbital angular momentum when we talk about an object (like a planet) orbiting around some axis that is not moving (like the Sun). That is, part of its motion is in a direction that is neither towards nor away from the axis; at least part of its motion is going around the axis. The orbital angular momentum also measures how hard it would be to stop the object from continuing to orbit around the axis.
Angular momentum is a conserved quantity—an object's angular momentum stays constant unless an external torque acts on it.
Axle
An axle is a central shaft for a rotating wheel or gear. In some cases the axle may be fixed in position with a bearing or bushing sitting inside the hole in the wheel or gear to allow the wheel or gear to rotate around the axle. In other cases the wheel or gear may be fixed to the axle, with bearings or bushings provided at the mounting points where the axle is supported. Sometimes, especially on bicycles, the latter type is referred to as a spindle.
Axles are an important structural component of a wheeled vehicle. The axles maintain the position of the wheels relative to each other and to the vehicle body. Since for most vehicles the wheels are the only part touching the ground, the axles must bear the weight of the vehicle plus any cargo.
Gear
Gears are mechanical parts with cut teeth designed to fit with teeth on another part so as to transmit or receive force and motion. Gears are also sometimes called toothed wheels or cogged wheels or cogs. The cut teeth are also sometimes called cogs.
Numerous nonferrous alloys, cast irons, powder-metallurgy and even plastics are used in the manufacture of gears. However steels are most commonly used because of their high strength to weight ratio and high cost.
Gear (disambiguation)
A gear is a toothed wheel designed to transmit force (torque) to another gear or toothed component.
"Gear" can also mean:
GEAR may refer to:
Gearshift
A gearshift (US English), gearstick, or gear lever (both UK English) is a metal rod connected with the manual transmission of an automobile that is used to choose the gear. In an automatic transmission, the same rod is usually called a gear selector.
Transmission
In mechanics, a transmission or gearbox means gears working together. The most common transmission is the transmission in a car.
In a car, the engine makes the crankshaft spin. The crankshaft makes the transmission's gears spin, which spin some more parts, which make the wheels spin. But the wheels do not spin as fast as the engine makes the crankshaft spin. That is because the gears are made to slow down the spinning. The gears also give the spinning more force (or to be more scientifically exact, more torque), so the wheels can make the entire car move. most transmissions have a breather vent to let hot air escape.
A transmission has some gears that change the torque more than other gears. That is why a transmission has a first gear, second gear, third gear, and sometimes more gears. There is also a reverse gear and neutral. An automatic transmission shifts between gears by itself (except reverse gear, and a parking gear). A manual transmission needs the driver to decide when to shift gears. Manual transmission is also called standard transmission. This is confusing because almost all cars in the U.S. have automatic transmission. In other words, since the late 20th century "standard" transmission has been unusual. A manual transmission usually has a clutch pedal, which the driver must press while shifting gears. An automatic transmission has a fluid coupling called a torque converter instead of a clutch. Some cars have a "clutchless" manual (semi-automatic) transmission, which has an automatic clutch (no clutch pedal), but does not shift gears by itself.
A layshaft is the middle shaft within a gearbox (transmission). When the clutch is engaged, the layshaft turns constantly. All gears on the layshaft turn at the same rate and are permanently attached. It carries gears but does not transfer the primary drive of the gearbox in of the gearbox or out of the gearbox. Layshafts are mostly known through their use in car gearboxes. The oil level in a gearbox is set to layshaft height. That way the spinning gears distribute oil to all the gears.
Not all transmissions are in cars. For example, bicycles have transmissions. You can see the gears, so it is easier to see how it works.
Hydraulics
Hydraulics is a topic of science and engineering subject dealing with the mechanical properties of liquids. Many machines work on hydraulic power.
One of the founders of modern hydraulics was Benedetto Castelli, a student of Galileo Galilei.
Fluid mechanics provides the theoretical foundation for hydraulics, which focuses on the engineering uses of fluid properties.
List of U.S. states and territories by area
This is a complete list of the U.S. states, federal district, and its major territories ordered by total area, land area, and water area.
Notes
Tom Vilsack
Thomas James Vilsack (born December 13, 1950) is an American politician. Vilsack is the 32nd and current United States Secretary of Agriculture since 2021 during the Joe Biden presidency. He was also the 30th Secretary of Agriculture from 2009 to 2017 during the Barack Obama presidency. He was the Governor of Iowa from 1999 to 2007.
Vilsack was born in Pittsburgh, Pennsylvania. At college, he met and married his wife, Christie. They moved to Iowa after graduation. They have two children.
Vilsack served in the Iowa State Senate before he ran for governor in 1998. He won that election and the next one in 2002. He chose not to run again in 2006.
In December 2006, Vilsack said he would run for the Democratic presidential nomination in 2008. He dropped out of the race a few months later. He endorsed New York Senator Hillary Clinton.
In December 2020, then-President-elect Joe Biden nominated Vilsack to serve as Agriculture Secretary for a second time. On February 23, 2021 the United States Senate confirmed Vilsack's nomination a second time with a 92-7 vote.
Actinide
The actinide series is the 15 chemical elements between actinium and lawrencium on the periodic table. They have the atomic numbers between 89 and 103. The actinide series is named after actinium. All of the elements are radioactive. Uranium is the most common natural actinide, and thorium second.
Opera Software
Opera Software is a company in Oslo, Norway that makes Opera, a set of tools for using the Internet.
Latin Grammy Award
The Latin Grammy Awards are awards given yearly by the Latin Recording Academy (an association of professionals who work in the Latin music industry) for outstanding work in the Latin music field. The award process is very similar to its American counterpart, the Grammy Awards. The Latin Grammy Awards was created because its organizers thought that the many musical styles of Latin music was too big to fit on the Grammy Awards. The Latin Grammy Awards focuses on music that comes from Latin America, Spain, Portugal, and the United States. One major difference between the Grammy Awards and the Latin Grammy Awards is that a recording that does not have to be released in the United States. To be considered for a Latin Grammy nomination, the song or album must be sung in Spanish or Portuguese.
Tiananmen Square
Tian'anmen Square (Tian'anmen Guangchang) is a large plaza near the center of Beijing, China. It is named after the Tian'anmen ("Gate of Heavenly Peace") which sits to its north, separating it from the Forbidden City (Zijincheng). Outside of China, the square is well known for the Tian'anmen Square protests of 1989.
The square is 880 meters south to north and 500 meters east to west, a total area of 440,000 square meters. It is the largest open-urban square in the world.
Hot sauce
Hot sauce, chili sauce, or pepper sauce are all spicy condiments made from chili peppers.
University of Prishtina