Diameter Black
Diameter Black
Predict the cost of buying a 32 cm diameter Black forest cake?
A bakery sells cakes by the kilogram. A black forest cake that has a diameter of 20cm and weighs 1kg sells for 12$. The following table shows some of the diameters of Black forest cakes of the same height versus their price.
Diameter of cake: 20, 28, 35, 40, 45, 53, 60
Price : 12, 24, 36, 48, 60, 84, 96
Predict the cost of buying a 32 cm diameter Black forest cake?
How high is the cake?
20cm cake: area of top of cake ~ 314.16
32cm cake: area of top of cake ~ 803.84
If 20cm of cake costs $12, I would think that a 32cm cake would cost around $30.70 since the cost per sq. cm is 12/314.16, or $0.038197.
Hope this helps.
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Black holes are probably the most fascinating (theoretical) things in astronomy. These objects, which scientists believe must exist, could explain the rate of rotation of our galaxy, which can be explained by the combined weight of visible stars. But what exactly are black holes?
In a document "Philosophical Transactions of the Royal Society of London," written in 1783 by John Michell, a Cambridge professor, noted how a star was massive and compact enough to have such a gravitational pull that no light can escape. It took the Einstein's general theory of relativity in the 20th century and the work of a graduate student from India, Subrahmanyan Chandrasekhar in 1928 to work in the mathematical details how massive a star should generate a black hole.
A black hole is thought to start with a star. The sun, with a diameter of about 865.400 miles, is considered an average size of stars, and it is basically a huge thermonuclear reactor, which fuel "enough" to maintain for very many generations. But what happens when fuel is a star burned?
There are several scenarios, depending on the size of the star. A cold (burning) star about one and a half times the size of the sun (now known as the Chandrasekhar limit), will collapse under its own weight. A star of life, although many times the size of the sun not sink into abroad because of their powerful force generated by nuclear explosions. When this force is going nuclear, however, that these massive bodies undergo dramatic changes.
A star less massive than the Chandrasekhar limit further the ability to stop the recruitment a radius of a few thousand miles. In this state is called a "white dwarf", and one inch cube of its mass weighing several hundred tons.
Another scenario for a cold star with respect to one or two times the mass of our sun is getting a "neutron star". A neutron star may have a radius of ten kilometers and weigh up to hundreds of millions of tons per cubic centimeter.
Since the gravitational attraction increases with mass, when a star dies, its surface gravity becomes stronger at become more compact. Indeed, a neutron star, for example, you can have a body with a radius of ten miles, exert gravitational attraction equal to and once more stars the size of the sun. And it is massive (in the familiar sense)!
But as spectacular transformations as it may seem, are nothing compared to the collapse of a star many times the size of the sun. In this case, the collapse does not stop at a radius of several thousand or even ten miles. The strength of its massive weight guarantees its collapse continued until it reaches a point, according to relativity General, which has infinite density and space-time curvature. Its radius is a fraction of a neutron star. And, therefore, a "black hole" invisible - if you shine the brightest light in this organism could not see because the light is trapped in the black hole and do not back to reach his eyes. In addition, in a black hole, the laws of nature as we know it would break down completely, leaving no viable method of predict future events in the black hole.
But if we see black holes, how do we know it exists? Although direct evidence of their existence is always referred to us, we seem to support the evidence (not proof) of their existence. We have cases of a star revolves around an invisible object, it is sometimes assumed to be a black hole. Sometimes we see the spectacular fireworks in remote regions space, which is sometimes regarded as produced by matter spiraling into a black hole, creating waves of powerful energy. (The reason for this energy is able to reach us is because it has not yet entered the "black hole event horizon, the point of no return, from which nothing can escape.)
So now, every year, but not fully proven, are based on mathematical calculations, logical deductions and observations. However, some fanciful speculations that go beyond the basics, it seems that the borders of the strange. One theory suggests that through a black hole, if feasible, would be like going through a wormhole "in space. This means that you can find in a completely different part of space.
As you can see, scientists sometimes go beyond verifiable risks into the unknown and even in the strangest. What I find even more strange is that some of the same scientists not to venture into the concept of God, despite the fact that there is logic that sufficient evidence to suggest that an intelligent creator must go. Why? Because they can not "prove" the existence of God? Since we can not really show anything that is accepted as science.
by Josh Greenberger of shopndrop.com
About the Author:
Josh Greenberger: A computer consultant for over two decades, the author has developed software for such organizations as NASA's Goddard Institute of Space Studies, AT&T, Charles Schwab, Bell Laboratories and Chase Manhattan Bank. Since 1984, the author's literary works have appeared in such periodicals as The New York Post, The Daily News, The Village Voice, The Jewish Press, and others. His articles have ranged from humor to scientific to topical events. Visit his site: shopndrop.com
Article Source: ArticlesBase.com - Black Holes (Astronomy)
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