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What causes the action force when a rocket rises?

A launching rocket follows Newton's third law, which states that every action has an opposite and equal reaction. The controlled explosion inside the rocket's engine is the pressure that creates the force. The pressure pushes the rocket one way and the gas the other way. The rocket lifts because the thrust (expelling of gas) from the engine is greater than the mass of the rocket. An unbalanced force is exerted. The amount of force is determined by the mass of the burned rocket fuel and by how fast the gas is expelled from the rocket. The motion is equal to and in the opposite directi..

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How do you determine air changes per hour?

To calculate the air change rate per hour, the velocity of the fresh air supplied by the ventilation equipment is multiplied by 60, with the velocity expressed in terms of cubic feet per minute. This number is then divided by the volume of the room in cubic feet. The volume of the room is calculated by multiplying the room's length by its width and height. The formula is n = 60q / V.\nBuilding code regulations, particularly mechanical specifications and ventilation design standards, usually specify the minimum required air change rate for different classes of buildings and certain types o..

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How many amino acids are considered to be essential amino acids?

The nine essential amino acids for humans are histidine, leucine, isoleucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. Other organisms have different essential amino acids. Nonessential acids do not need to come from food because they can be made by the body. Only 20 amino acids are used by all life forms; however, 500 different amino acids exist on Earth.\nProteins come from a string of monomers, or building blocks, called amino acids. These amino acids combine with one another to produce the large number of proteins used for various structural and functional needs..

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What is the empirical formula of ethyl butyrate?

The empirical formula is also known as the simplest formula.\nEthyl butyrate has the chemical molecular formula of CH3CH2CH2COOCH2CH3. For the empirical formula, separate the elements. In one molecule, there are six atoms of carbon, 12 of hydrogen and two of oxygen. Divide the numbers of elements by two to find that three carbon, six hydrogen and one oxygen remain. The resultant empirical formula is C3H6O.

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What is a normal size for a uterus and ovaries?

The uterus can grow slightly in size after a woman gives birth, adds Dr. Dileo. Doctors use a pregnancy scale to describe the size of the uterus. For instance, if the uterus is enlarged to 12 centimeters, it can be described as being "10 weeks size," meaning it's the same size as in the 10th week of pregnancy.

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What are some common features of a constellation map?

When using a star chart, hold the chart up in front of you, and rotate it so that the direction you are facing is on the bottom of the chart. Then, hold the chart up in front of you, and compare the stars in the sky to the stars on the map.\nStar charts represent constellations and stars when viewed from a specific latitude, so depending on how above or below that latitude you are standing, the stars shift accordingly. Because the earth is constantly rotating, star charts are only accurate for a certain time of the year, usually divided by month. Star visibility also differs by the time of day..

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What are the four types of erosion?

Sheet erosion occurs when a very thin layer of surface dirt or soil is removed from a large area. The result of rill erosion is a set of small channels viewed on a slope that are caused by running water. Gully erosion exists when larger and wider channels are cut out of slopes by running water. Splash erosion is caused by the movement of splashing water.

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What animals live in the Amazon River?

The Amazon River contains some famous species, such as its dolphins, along with lesser-known organisms and those awaiting classification. Some Amazon creatures classify as endangered or vulnerable, such as the Amazon River dolphin. This dolphin, also called the pink dolphin, survives only in freshwater habitats. Pink dolphins live in tributaries and estuaries of many Amazonian nations, including Ecuador, Brazil and Peru. The giant river otter, an endangered species, relies on a diet of fish. These otters reach up to six feet as adults and weigh over 200 pounds. They face threats from several s..

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What is a beaker tong?

The grips of beaker tongs can burn when they become too hot, releasing an unpleasant odor. Beaker tongs are generally found in a laboratory setting alongside beakers, Bunsen burners, Bunsen burner rings, wire gauze pads or hot plates. The tongs are used to handle beakers that have been heated over either a Bunsen burner or a hot plate.

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What is an equatorial climate?

Tropical rain forests receive an average of 4 inches of rain every month. Because the air in these areas is so humid, at least 50 percent of the rainfall received is formed in the area rather than travels to the area from somewhere else. After the rain falls, it is heated by the sun and turned into vapor which is pulled back up into the air, creating more rain. Equatorial climates have a large number of trees with wide leaves and branches. This canopy of trees keeps a large amount of the rainfall the area receives from ever reaching the ground. The water primarily stays in the trees. Because o..

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