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What is the function of force table?

The force table is composed of a circular ring attached to chains or strings from which weights may be dangled. The ring and attached strings are suspended over a protractor disk that measures the angle of the strings. To use the force table in a physics experiment, weights are attached to three or more strings connected to the ring. As each weight is applied, the string pulls the ring towards its side. When another weight is placed on a separate string on the opposite side, it will also pull the central ring towards its direction. This creates a state of tug-of-war between the weights as the ..

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How do stratovolcanoes form?

Stratovolcanoes feature gently sloped lower elevations, steep upper elevations and a small vent at the top. Part of the reason that stratovolcanoes grow so large is that their magma has an exceptionally high viscosity and percentage of dissolved gases. This thick lava does not spread out like it does in shield volcanoes, which form low, flat structures.\nStratovolcanoes differ from both shield volcanoes and scoria volcanoes, the other two major types of volcano, in their rate of eruptions. Stratovolcanoes take a long time to develop enough magma to cause an eruption. Unfortunately, this means ..

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What are some examples of rectilinear motion?

When studying physics, the most common examples of rectilinear motion use falling objects. Because of the effects of gravity and friction on anything moving in a horizontal direction, having those objects continue to move in a perfectly straight line is extremely unlikely. Even in the case of the train, having a perfectly straight track for the complete duration of the trip is not a realistic scenario. However, tracking a falling object involves a straight line, because gravity forces that object to take the straightest path to the ground.\nOther physics problems examine the effects of forces ..

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What is a particle of light called?

Einstein predicted in 1905 that light might have an actual physical form, which was proved correct in the following decades. It was still several more decades before enough experiments were done for Einstein's ideas to become the standard with regard to light and photons. Einstein worked on his light theory for the rest of his life, but it took the creation of the field of quantum electrodynamics to answer all of the questions about light and his theories.

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Why is geography considered a science?

Geographical discoveries, including the north and south poles, the earth’s magnetism, and rotation and revolution were made through observations, hypothesis and experimental testing.\nThe study of geography as a science underwent a transformation in the late 1950s due in part to the work of Kurt Schaefer, a German professor at the University of Iowa, who published a 1953 paper that attempted to redefine the notion of geography in scientific terms. Prior to Schaefer's paper, the common belief was that geography was mainly focused on sociological relationships. This belief undermined the ..

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What are the requirements for wiring a GFCI circuit?

A GFCI, which keeps electricity from flowing where it shouldn't, prevents fires and electrocutions. GFCIs are designed to shut off power quickly when they detect a difference in current flowing out and in along the circuit conductors. A GFCI is not itself a circuit. Rather, it is a component that monitors the rest of the circuit. Circuits without GFCIs do not differ in any substantial way from circuits without them, although they are considered less safe to use.\nThe NEC, which is the governing body over electrical regulations in the United States, changes GFCI requirements on an almost a..

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What are some examples of polygenic inheritance?

The following are also examples of polygenic traits in humans:WeightLupusFingerprintsHeart healthBehavioral traitsThese traits have the following genetic characteristics:At least two genes contribute to the phenotypic expressionThe traits are typically quantified using measurement, rather than counting as with Mendalian inheritanceThe phenotypic expression of the trait can vary over a wide range

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When did the first eclipse occur in 2010?

The rest of the eclipses that 2010 held were a partial lunar eclipse on June 26, a total solar eclipse on July 11 and a total lunar eclipse on December 21. The first eclipse occurred in western Sagittarius at the moon's ascending node. It was seen in eastern Asia, central Africa and the Indian Ocean. The eclipse started at 5:14 Universal Time in the westernmost part of Central African Republic.

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What are two major forces that shape the earth?

There are both internal forces and external forces that shape the surface of the Earth. Erosion, in the form of wind, water and ice, is an external force. It is a natural process, though it is increased due to humans' land use. Volcanoes are an example of internal forces at work shaping the Earth. Magma is forced to the Earth's surface, becoming hot lava and creating changes in the surface of the Earth.

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How is radioactive dating used to determine the age of an object?

The key to an age of a substance is the decay-product ratio. The ratio of the original isotope and its decay product determines how many half-lives have occurred since the sample formed. A half-life measures the time it takes for one half of a radio isotope's atoms to break down into another element. For instance, if an object has 50 percent of its decay product, it has been through one half-life.\nA popular way to determine the ages of biological substances no more than 50,000 years old is to measure the decay of carbon-14 into nitrogen-14. This process begins as soon as a living thing d..

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