Science & Mathematics - 29 August 2007

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What is Chaos Theory?

2007-08-29 23:59:58 · 10 answers · asked by Jim 7 in Other - Science

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A woman of mass m stands at the edge of a solid cylindrical platform of mass M and radius R. At t=0, the platform is rotating with negligible friction at angular velocity ωo about a vertical axis through its center, and the person begins walking with speed v (relative to the platform) toward the center of the platform.

a. Determine the angular velocity of the system, as a function of time.
b.What will be the angular velocity when the woman reaches the center?

2007-08-29 23:58:16 · 1 answers · asked by physics maniac 2 in Physics

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Peace036 – Are you in favor that we changeover from the present Gregorian calendar to a perpetual one?

The present calendar was promulgated by Pope Gregory XIII in 1582. It replaced the more than 1600-year-old Julian calendar that Julius Caesar instituted in the Roman Empire in 45 BC.

The Gregorian has several problems that it needs to be reformed. How would you like that we changeover to a perpetual calendar so that we don’t change the calendar anymore? The new calendar will still have 365 days in a common year and 366 days in a leap year, 12 months in a year starting from January 1 and ending on December 31, and with the same rules for leap year.

To make it perpetual and more uniform, we just make each quarter equal to 91 days or 13 weeks. The fourth quarter will have 92 days with December 31 as a no-weekday and an official public holiday throughout the world. During leap years, the second quarter will have 92 days also with June 31 as a no-weekday and a bonus public holiday.

2007-08-29 23:49:51 · 1 answers · asked by Peace Crusader 5 in Other - Science

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Would it be possible to see the landing site on the moon with a very powerfull telescope?

If so, has anyone done it? are there photo's of it? And how many people have actually been on the moon?

2007-08-29 23:36:07 · 6 answers · asked by Anonymous in Astronomy & Space

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How long to thunder storms normally last?

I live in Switzerland and a couple of days ago the storm started at about 10.00 a.m. and continued for 24 hours. There was a short pause and then they started again.The last flash of lightning and thunder roll was round about 4.00 p.m.. That's 30 hours! Can anyone beat this?

2007-08-29 23:29:05 · 5 answers · asked by cymry3jones 7 in Weather

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Sodium carbonate. Is this the same as the Washing Soda which I have?

I bought a 'Qwicksilver' electrolytic cleaning plate. It acts with sodium carbonate to clean all kinds of metal and jewellery. Is this the same as Washing Soda?

Also, how does sodium carbonate differ from bicarbonate of soda?

2007-08-29 23:28:35 · 10 answers · asked by Songbird 3 in Chemistry

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If we look at sun during solar eclipes even for 16th part of second our retina may burn why??

But it is not that harmful during normal days why??

2007-08-29 23:27:51 · 4 answers · asked by Zany 1 in Astronomy & Space

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Want list of microorganisms causing intestinal diseases badly?????

Can anyone just help me find out microorganisms causing intestinal diseases...... thank you in advance.......

2007-08-29 23:26:34 · 1 answers · asked by Anonymous in Medicine

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What's the most venomous insect in the UK?

2007-08-29 23:17:24 · 15 answers · asked by Anonymous in Zoology

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When you use a microwave, does it change the molecular structure of food cells?

2007-08-29 22:58:30 · 10 answers · asked by Kathie 4 in Other - Science

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What is the role of intuition in the area of Natural Sciences?

How does intuition help in Natural sciences..like Chemistry, Biology & Physics...

2007-08-29 22:47:32 · 1 answers · asked by Abc 2 in Other - Science

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Was that Uranus I saw?

No. This is not a joke. Please people. (funny though)

Anyway, last night from 9pm to 10pm I happened to saw a planet.

However I was very sure which planet it was. I am thinking maybe Uranus? As you know, it is just a day or two after a full moon and the planet was south of the moon. (meaning when i was facing the moon, the planet was behind me) It was also rather bright and did kind of stood out.

Also, I often get confused with spotting Jupiter and Saturn. I understand Jupiter is brighter but it is often hard to tell the difference between them. Can anyone help me with this also?

2007-08-29 22:45:12 · 12 answers · asked by questionsohquestions 1 in Astronomy & Space

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do u know why fig tree latex can heal warts?

2007-08-29 22:42:32 · 3 answers · asked by Anonymous in Botany

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Prove that alpha^2 + beta^2 + gamma ^2 = 1?

The direction cosines of a vector are the cosines of the angles it makes with the coordinate axes. The cosine of the angles between the vector and the x, y, and z axes are usually called in turn alpha, beta, and gamma. Prove that alpha^2 + beta^2 + gamma ^2 = 1, using either geometry or vector algebra.
(more interested in how to prove it with vector algebra, but geometry is fine too.)

2007-08-29 22:38:34 · 3 answers · asked by tyj8tim 1 in Mathematics

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Seek help on divisibility?

show that 27 x 23^n + 17 x 10^2n is divisble by 11 for all positive integers n.

Appreciate if anyone can assit. Thanks

2007-08-29 22:33:29 · 5 answers · asked by silent 1 in Mathematics

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Trigonometry?

Find the sum to n terms of the series
Cos^2 a + Cos^2 2a+Cos^2 3a+………..

Find Sina - Sin2a + Sin3a - Sin4a ………. n terms.

2007-08-29 22:24:27 · 2 answers · asked by TiMe_on_WeeLz 2 in Mathematics

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how to develop our communication?

2007-08-29 22:05:53 · 2 answers · asked by BHUVANA K 1 in Engineering

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Question for PHYSICS WIZARDS out there!?

this is about torque,,,A magnetic tape is being played on a cassette disk. the tension in the tape applies a torque to the supply reel. assuming the tension remains constant during playback, discuss how this torque varies as the reel becomes empty.

2007-08-29 22:05:32 · 5 answers · asked by Anonymous in Physics

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how are reptiles distributed zoogeographically?

I would like to know how reptiles are distributed zoogeographically

2007-08-29 21:50:31 · 2 answers · asked by Anonymous in Zoology

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how do cans of drink get the design on?

sprayed with ink, thin layer of something....we're being inquisitive!!!

2007-08-29 21:35:12 · 9 answers · asked by Carrot 4 in Engineering

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Why do most people think that Evolution is bogus while the majority of Scientists do not?

Something like 99% of biologists think that evolution via natural selection explains the creation of human beings. Why do most people doubt this? And why do they think there is a controversy among scientists where none exists? It's true there are biologists (like Michael Behe) who doubt evolution. But the overwhelming majority do not doubt it.

Now, it's one thing to doubt Evolution, but it's entirely different to claim THAT THERE IS A CONTROVERSY AMONG SCIENTISTS WHERE NONE EXISTS.

http://www.talkorigins.org/faqs/steve/

2007-08-29 21:26:32 · 6 answers · asked by heartfelt_atheist 2 in Biology

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when did god give man permission to invent a robot,?

that is like being god like because god made man
and we will do the next best thing like that,

wea re aere all copy cats

2007-08-29 21:24:23 · 7 answers · asked by Anonymous in Engineering

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how to prove this express is larger than the other one?

Can anyone give me a hint on prove this
Summation from k=1 to n
log(n!/(n-k)!)*log(n-k)

is larger than this

Summation from k=2 to n
log((k-1)!)*log(k+1)

2007-08-29 21:18:24 · 1 answers · asked by Mgccl 1 in Mathematics

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AP Biology Challenge Question about Vitalism?

I'm having trouble answering this questions. Can someone please help me?

Vitalism is the belief that life possesses supernatural forces that cannot be explained by physical and chemical properties. explain why the concept of emergent properties does not lend credibility to vitalism?

2007-08-29 21:09:54 · 2 answers · asked by APerfectSonnet 2 in Biology

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