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What is chemical energy used for?

Many sources of energy, or fuels, are forms of chemical energy. The method for using the chemical energy in fuels is by burning them. Wood, coal, gasoline and natural gas are burned to release heat through a chemical reaction called combustion, which is a reaction that produces thermal energy. Chemical energy is the most commonly used form of energy by humans. From TV remotes and battery-powered cellphones to gas-powered automobiles, this energy performs many important functions. Reactions that occur in chemical compounds produce chemical energy. Food consumption is a simple example of obtaini..

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What is a Canadian cherry tree?

Canadian cherry trees are native to North America and grow to a maximum height of 16 feet. They are very hardy trees that tolerate a wide range of environmental conditions and can survive in temperatures as low as -40 degrees Fahrenheit. In the autumn, leaves turn a deep maroon color. Chokecherries can be eaten from the trees by humans and are often used in jams, jellies and syrups. The chokecherry fruit also makes excellent bird food.

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What type of energy does a spinning turbine have?

An object's mechanical energy never changes, even though kinetic and potential energy are variable. This is because if kinetic energy increases, potential energy drops equivalently, and vice versa. To use the turbine example, if the turbine begins to spin faster, its kinetic energy increases while its potential energy decreases. If the turbine begins to spin more slowly, its potential energy increases while its kinetic energy decreases. Either way, the turbine's mechanical energy remains exactly the same because it is the sum of the two other varying energy types.

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What color complements pink?

If walls are painted a pale pink or darker salmon color, mint green and creamy yellow accent pieces can be introduced to create a whimsical feel. Avocado green pairs well with a darker pink. Better Homes and Gardens suggests painting walls lemon yellow and the ceiling pale blue and introducing hot pink accents to a room. A bedroom with chocolate brown walls, pink bedding and crisp white accents creates a sophisticated look.

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How do you calculate gear ratios?

Gears consist of toothed wheels that are attached to shafts. The teeth are interlocked in a manner such that as one wheel rotates, the adjacent wheel rotates in the opposite direction. The rotating wheels also differ in speed. When a number of gears are connected together, they form a system referred to as a gear train. Input is connected to the driver gear, while the output is connected to the driven gear.\nIf the connected wheels have varying sizes, the smaller gear rotates faster. The gear ratio, also known as the velocity ratio, is the difference between the speeds of the varying wheels. T..

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Where is the deepest hole dug by humans?

Prior to the Sakhalin 1 project, the deepest hole ever dug by humans had been a project begun by the Soviet Union on the Kola Peninsula in Russia near Murmansk, which was later abandoned, and a project completed in the Al Shaheen oil field in Qatar in 2008. The Al Shaheen well was drilled by Transocean for Maersk Oil.

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Why must a purine pair with a pyrimidine?

Matching base pairs composed of one purine and one pyrimidine form hydrogen bonds. Purines have a double ring structure, and pyrimidines have a single ring structure. Adenine and thymine both have two sites where they form hydrogen bonds to each other, while guanine and cytosine have three sites. Bonded together, these nitrogenous bases form the rungs of the DNA ladder, or double helix.\nThe hydrogen bonding between rings is only possible in specific tautomeric form. As explained by the University of Maine’s Department of Chemistry, tautomers are isomers related by the changing position of a..

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What is formed when copper reacts with oxygen?

The black copper oxide that is produced can be restored to original copper color through a reaction with hydrogen. Heated black copper oxide that is placed within a hydrogen atmosphere results in not only the original copper but water as well.\nIf the heated copper is removed from the hydrogen atmosphere, it turns black, forming copper oxide once again. This occurs because the copper is still warm enough to cause the original reaction between copper and oxygen.

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What is the density of mild steel?

The amount of carbon mixed with iron helps determine the properties of steel. Steel is stronger and less brittle than iron products, such as cast iron or wrought iron. There are more than 3,500 grades of steel, all with varying chemical and physical make-ups. Henry Bessemer created the process by which modern-day steel is produced. The Bessemer Process has been the basis for ongoing technological advances in steel.

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How fast does the space shuttle go?

The speed of the space shuttle varied according to how far it is from the Earth. To reach those high speeds, the space shuttle used a mixture of very cold oxygen with hydrogen as fuel. The ship also uses hydrazine, monomethylhydrazine and nitrogen tetroxide. The fuels burn so hot that the shuttle had a necessary heat protection system, which was made mostly of sand formed into tiles. Because the shuttle was able to go so fast, astronauts got to see more than their share of sunrises and sunsets as one or the other happens every 45 minutes.\nNASA actually built six space shuttles to orbit the Ea..

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