Science & Mathematics - 25 November 2007

2007-11-25 02:29:28 · 7 answers · asked by Jon W 1 in Physics

now imagine theres a point A at height of 40 metres . now from that point a thin non elastic lace (thread) starts to materialize(magically orignate) and run down and hits the ground due to gravity. the lace keeps on appearing and its like endless. now when it appears at point A its velocity is zero but it gets jerked up to a velocity . now what would be the vellocity of the lace when hits the ground after runnin down 40 metres. AIR RESISTANCE IS TAKEN AS ZERO. here gravity is acting on the vertical length of the lace which is forty metres. according to me the lace can have a maximum velocity of only 20 m/s. which is less than 28 m/s when u drop something from a height of 40 metres..

2007-11-25 02:19:35 · 5 answers · asked by balaji.k 2 in Physics

do you know some interesting facts about oxygen, is there any dangers associated with it, and where is it found in nature

2007-11-25 02:15:38 · 6 answers · asked by Anonymous in Chemistry

2007-11-25 02:12:47 · 11 answers · asked by Jacqui S 1 in Mathematics

2007-11-25 02:12:36 · 1 answers · asked by Anonymous in Other - Science

2007-11-25 02:12:15 · 10 answers · asked by Tracy Terry 2 in Astronomy & Space

2007-11-25 02:11:58 · 8 answers · asked by Anonymous in Biology

2007-11-25 02:11:46 · 1 answers · asked by Anonymous in Earth Sciences & Geology

Please don't fool around.

2007-11-25 02:10:58 · 2 answers · asked by Anonymous in Weather

Other than it being the end of the Mayan calender and of course the Olympics in england etc...
I'll paste somethings that are meant to happen:

1. Humanity and Planet Earth are currently going through a huge change or shift in consciousness and reality perception.

2. The Mayan civilization of Central America was and is the most advanced in relation to time-science knowledge. Their main calendar is the most accurate on the planet. It has never erred. They actually have 22 calendars in total, covering the many timing cycles in the Universe and Solar System. Some of these calendars are yet to be revealed.

3. The Mayan fifth world finished in 1987. The sixth world starts in 2012. So we are currently "between worlds". This time is called the "Apocalypse" or revealing. This means the real truth will be revealed. It is also the time for us to work through "our stuff" individually and collectively.

4. The Mayan sixth world is actually blank. This means it is up to us, as co-creators.

2007-11-25 02:10:06 · 17 answers · asked by Missy 4 in Astronomy & Space

A person lifts a 3.8 kg cement block a vertical distance of 1.42 m and then carries the block horizontally a distance of 10.30 m.

2007-11-25 02:09:55 · 8 answers · asked by Anonymous in Physics

I have heard several contidictory answers.

2007-11-25 02:08:45 · 7 answers · asked by Anonymous in Astronomy & Space

2007-11-25 02:07:43 · 3 answers · asked by sen_arabinda3 1 in Weather

2007-11-25 02:00:39 · 7 answers · asked by Anonymous in Biology

2007-11-25 01:54:30 · 6 answers · asked by Leece..<3 1 in Physics

science homework: how does a helicopter work, please help

2007-11-25 01:53:17 · 2 answers · asked by Anonymous in Engineering

Hiya!
Could you please tell me
1. How could a satellite be placed in orbit around Mars &
2. How can it stay in orbit around Mars?

Any web pages and things like that would be very useful :)

2007-11-25 01:49:42 · 4 answers · asked by Anonymous in Astronomy & Space

I have 188 problems to do and I can only do about 160... the rest throw me off a bit. Please help! Thanks.

A voltaic cell is constructed that uses the following reaction and operates at 298 K.

Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s)

(b) What is the emf of this cell when [Ni2+] = 2.26 M and [Zn2+] = 0.116 M?
Answer in Volts...
(c) What is the emf of the cell when [Ni2+] = 0.239 M and [Zn2+] = 0.829 M?
Answer in Volts....
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(a) A Cr3+(aq) solution is electrolyzed using a current of 8.25 A. What mass of Cr(s) is plated out after 2.20 days?
Answer in Grams...
(b) What amperage is required to plate out 0.255 mol Cr from a Cr3+ solution in a period of 8.00 hr?
Answer in A...
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2007-11-25 01:49:01 · 1 answers · asked by Jen 1 in Chemistry

2007-11-25 01:47:17 · 2 answers · asked by আমন্দ 3 in Medicine

we r made to memorize the properties of the VECTOR SPACE . But i want to understand its importance in physical sence. thanks

2007-11-25 01:46:25 · 2 answers · asked by zaeee 1 in Physics

if so which ones?

2007-11-25 01:41:31 · 7 answers · asked by Ste B 5 in Astronomy & Space

I've been wanting to learn about Dark Matter. Have we found it yet? Have we even obtained some? My friend once told me a couple of weeks ago that scientists have, over the last seven years, gained around... oh say a square inch of it. Is that even true? Thanks for your responces!

2007-11-25 01:40:52 · 4 answers · asked by Samson 4 in Other - Science

In terms of physiogomy, what characteristics are associated with an "earth" body type?

2007-11-25 01:36:47 · 3 answers · asked by Anonymous in Other - Alternative

the earth has a crust mantle and core. We have never dug below the crust,so how do we know? tell me how scientists have investigated the structure of the earth. Tell me if you know!!!!!! and serious answers

2007-11-25 01:36:40 · 5 answers · asked by aakruti4u_irock 1 in Earth Sciences & Geology

2007-11-25 01:33:16 · 8 answers · asked by ? 2 in Biology

i thought it was because the Earth orbits the Sun in an oval rather than a circle and summer was when we were closest to it, but since its summer south of the equater now that can't be it, so is it the tilt of the Earth that causes it or something else?

2007-11-25 01:31:27 · 8 answers · asked by Ste B 5 in Weather

or are some places having summer while we in the uk are in winter.

2007-11-25 01:17:56 · 7 answers · asked by Ste B 5 in Weather

2007-11-25 01:14:45 · 4 answers · asked by medicine wheel 3 in Physics

Can someone help me figure out this one problem??

square root of x+1/x^3

thanks..

2007-11-25 01:10:08 · 3 answers · asked by chhtdelilah 2 in Mathematics

studing As level sciences or mathematics early?

should i focus on my GCSEs?

2007-11-25 01:07:20 · 5 answers · asked by Nick 4 in Physics