Science & Mathematics - 6 October 2006

Hey, I study Astronomy at GCSE level and have recently studied black holes. I have, of course, come across the normal theory of what a 'black hole' is - a star which has died and is so dense, and has such a strong gravitational force, that light simply cannot escape from it. But, after reading an Astronomy textbook written by Patrick Moore, I have come across another, slightly different theory for it.

It states that when a star (with a mass 8 times larger than that of our own Sun) dies, it collapses, extremely violently, and keeps doing so until the rate of its collapse exceeds the speed of light - thus being faster than light itself and not alowing any to escape. The nearest black hole similar to this is said to be Cygnus X-1, 6500 light-years from the Solar System.

I cannot find any other reference to this theory. Are black holes caused by strong gravity or bloody high speeds? Or have I just mis-interpreted the text?

2006-10-06 11:41:39 · 6 answers · asked by Anonymous in Astronomy & Space

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What is the answer to (m)(m)-2m, if m=2?

2006-10-06 11:38:35 · 16 answers · asked by Carlyn 2 in Mathematics

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If a man gets a sex change and becomes a woman, can he have babies?

If a woman gets a sex change and becomes a man, can she get another woman pregnant?

2006-10-06 11:32:41 · 39 answers · asked by Emily 3 in Medicine

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ok explain pyroclastic clouds?

2006-10-06 11:32:23 · 4 answers · asked by STORMY K 3 in Earth Sciences & Geology

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A boggling puzzle?

A heavy armchair is currently on a black tile on the floor. You want to move it so it is on the adjacent white tile, facing the same way. It is so heavy that you can only move it by swiveling it by 90 degrees around one of its corners. Is it possible to make the move?

2006-10-06 11:29:41 · 5 answers · asked by Algorithim007 1 in Mathematics

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Can something have energy without having momentum? Can something have momentum without energy?

2006-10-06 11:29:19 · 9 answers · asked by whoknows 1 in Physics

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Why @ certain speeds a car with its windows open and with the air conditioner turned off can consume more fuel

2006-10-06 11:27:34 · 13 answers · asked by whoknows 1 in Physics

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can mitosis occur without cytokinesis?

I know sometimes meiosis can occur in error, i.e. some cells are left with an extra chromosome which can lead to disorders such as down syndrome. Prior to meiosis, however, animal cells undergo mitosis and cytokinesis. Mitosis occurs when the nucleus splits, and cytokinesis occurs when the cytoplasm, or essentially the rest of the cell splits. It appears to be generally accepted that the 2 occur in sync. But I wonder if mitosis could just occur without cytokinesis occuring? Like could the nucleus just spit into 2 (mitosis), but the cytoplasm still remain intact, resulting in a single cell with 2 nuclei? And if so what would be the results of such an occurence?

2006-10-06 11:27:18 · 8 answers · asked by Anonymous in Biology

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what is the advantage of vibration diagnostics of gear box?

2006-10-06 11:23:50 · 2 answers · asked by Anonymous in Engineering

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What is the equivalent of 6ft in inches?

2006-10-06 11:22:43 · 21 answers · asked by willow 1 in Mathematics

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Why does the force of gravity do no work on a bowling ball rolling a long a bowling alley?

2006-10-06 11:21:51 · 13 answers · asked by whoknows 1 in Physics

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How do I determine an angle in a right triangle if I know all of the leg lengths?

2006-10-06 11:20:34 · 14 answers · asked by toast442005 1 in Mathematics

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I need to find a symbol for discontinuity, continuity, for all the types of curves and for undefined functions

I'm a fan of math symbols. I would like to write all my math statements using symbols. I also need to write "if" using a symbol.
Send me the symbols I asked for and also others, the most you can put your hands on.

2006-10-06 11:18:05 · 5 answers · asked by Arc 2 in Mathematics

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What is nanotechnology?

2006-10-06 11:15:50 · 101 answers · asked by Ala 1 in Engineering

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formula to figure out area of concrete to redi mix bags?

2006-10-06 11:15:41 · 4 answers · asked by vivian a 1 in Mathematics

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Math help please??

Katherine runs her own pizza shop. For each pizza she spends $3.92. She sells it for $5.84. How much % profit does she make??

2006-10-06 11:15:07 · 10 answers · asked by z 2 in Mathematics

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How can I extract the carbohydrates?

I am interested in extracting carbohydrates from isotonic drinks and then working out % by mass in solution.

2006-10-06 11:11:48 · 6 answers · asked by Anonymous in Chemistry

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How can i make a big crystal out of alum or any other type of crystal making mineral that u can buy?

Well im interested with crystals and have a smithsonian crystal making set with 9 crystals.they r all small and now i want to make a big crystal out of sum kind of mineral that u can buy at a store.can any1 help?thx for answers!im accepting answers for life!

2006-10-06 11:11:00 · 1 answers · asked by APew! 2 in Chemistry

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