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How is wind energy obtained?

A wind turbine works in a way opposite to that of a fan. Whereas a ceiling fan uses electricity to rotate and make wind, a wind turbine takes the kinetic energy of wind and turns it into electricity. A wind turbine has assessment equipment that positions the blades in the optimal angle for wind capture. When wind blows, blade rotation triggers an internal shaft connected to a gearbox that, in turn, increases the rate of rotation and powers a generator that produces electricity.\nAs the wind turbine produces energy, it sends the electricity to a main power grid, from which smaller distribution ..

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What is a naturally magnetic rock?

All magnetite minerals display magnetism, but lodestone is the only one possessing north-south polarity. This property was noticed as early as the 4th century B.C. by the Chinese, who used primitive compasses made with lodestone. Another well-known property of lodestone is its ability to attract iron, which was first noted by the ancient Greeks in 600 B.C. This phenomenon was unexplained until scientist Peter Wasilewski demonstrated that lodestone may develop strong magnetic fields after being struck by lightning.

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What is a Durham fermentation tube?

The carbohydrate fermentation test helps identify different types of bacteria based on which sugars they are able to ferment. If a bacterium can ferment the sugar, it results in acid production, gas production or both. If fermentation results in acid production, the broth changes colors. Gas production is seen as a gas bubble in the Durham fermentation tube. If the bacteria cannot ferment the sugar, there is no change in the broth.

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How many gallons of water fill a 4-inch by 200-foot pipe?

The formula for volume of a cylinder is the cylinder’s radius at one end squared times the cylinder's height times the constant Pi, or 3.14. Using this formula, the volume of a 4-inch by 200-foot pipe is 30,159.36 cubic inches. Since 1 cubic foot contains 1,728 inches, the pipe’s volume is 17.45 cubic feet. Since 1 cubic foot of volume holds 7.48 liquid gallons, 130.56 gallons of water fill the pipe.

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How do you view a color chart with the different shades of purple?

Some shades of purple are electric purple, royal purple and Han purple. Others include the colors lavender, plum, orchid, fuchsia and magenta. Violet, while typically considered a shade of purple, is actually one of the true colors in the visible spectrum of light, whereas purple is a mix of two other true colors: blue and red.\nIn antiquity, the color purple was symbolic of royalty. Tyrian purple, the shade from which this symbol originates, was created with a dye from a mollusk harvested on the shores of Tyre in ancient Phoenicia. Only the very wealthy could afford the dye, so Tyrian purple ..

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What does the nucleus contain?

The chromosomes in the nucleus contain DNA, or nucleic acid, which holds heredity information and instructions for cell growth, development and reproduction. Ribonucleic acid, also known as RNA, is combined with proteins to create dense structures called ribosomes, which are also contained within the nucleus. Ribosomes basically organize and manage inner-cell proteins. The nucleoskeleton is a part of the nucleus that adds mechanical support to the overall cell.\nThe nuclear membrane, which consists of an inner membrane and an outer membrane, completely separates the nucleus from the rest of th..

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Do toenails grow back?

If the lunula is damaged, a toenail still grows back, but nail growth is permanently changed. These changes can include the nail having a bumpy texture or the nail becoming much thicker.\nNail loss can be due to a trauma or a fungal infection, which can cause the nail to become detached from the nail bed. A detached toenail appears white in the area that has separated from the nail bed.

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Is sodium carbonate a strong base?

An acid is defined as an element that breaks apart in water to produce positively charged hydrogen (H+) ions, while a base reacts with water to form negatively charged hydroxide (OH-) ions. Acids are defined as anything with a pH below seven, while a base is any solution with a pH higher than seven. The pH scale runs from zero to 14, meaning sodium carbonate with a pH of just over 11 is only a medium-strength base

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Are boys naturally stronger than girls?

The study by the University of Indiana examined the athletic performance between boys and girls, using data compiled by USA Swimming. The researchers compared performance in the 50-meter freestyle among swimmers aged 6 to 19 years old, analysing roughly 1.9 million swims in all. They selected this specific race, as performance at this distance is dictated by muscular power and function rather than training. Performance was identical between boys and girls at age 8 or younger, and little difference was found between the sexes at the ages of 11 to 12 years. Significant differences in performance..

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What are the large sections of the lithosphere called?

The tectonic plates are an important part of understanding the evolution of the appearance of the Earth through the years. In general, the plates measure about 100 to 200 kilometers thick. Underneath these tectonic plates, the hot asthenosphere moves and causes the movement of the plates above.\nThe movement of these plates causes the land masses to slowly move. Earth looks very different in modern times than millions of years ago. Continents collide and move apart as a result of the plates. The movement of two plates against one another causes earthquakes and forms mountains.

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