Science & Mathematics - 23 August 2007

this is new to me,instructions are vague,would like to know how you say thank you on here when someone goes out of thier way to help????

2007-08-23 23:52:49 · 20 answers · asked by peanut m 1 in Astronomy & Space

And how concerned about my cat should I be? Also if it helps at all I live in a new housing development in Phoenix, AZ. http://www.flickr.com/photos/76337285@N00/

2007-08-23 23:40:11 · 5 answers · asked by Clyde B 1 in Zoology

Assuming we can pass through lavas, etc inside the earths core with some special equipment.

2007-08-23 23:39:26 · 13 answers · asked by Raja S 2 in Physics

If a plane is travelling faster than the speed of sound but emits no sound. do you still get the sonic boom

2007-08-23 23:34:40 · 8 answers · asked by leerobo 2 in Physics

2007-08-23 23:33:05 · 17 answers · asked by arvind s 1 in Astronomy & Space

Weather forecast for Mornington Peninsula 15th September 2007

2007-08-23 23:28:18 · 1 answers · asked by Anonymous in Weather

1. The sum of two sinusoidal traveling waves is also a sinusoidal traveling wave only if:
A. Their amplitudes are the same and they travel in the same direction.
B. Their amplitude are the same and they travel in opposite direction.
C. Their frequency are the same and they travel in the same direction.
D. Their frequency are the same and they travel in opposite direction.
The answer is C. Why? Does it mean that is their frequency aren’t the same, no traveling wave will be formed?

2. When 450 nm light is incident normally on a certain double slit system, the number of interference maxima within the central diffraction maximum is 5. When 900 nm light is incident on the same slit system the number is:
A. 2
B. 3
C. 5
D. 9
Please show solution and explanation, thanks!

2007-08-23 23:07:35 · 2 answers · asked by MatT 7 in Physics

2007-08-23 23:00:17 · 9 answers · asked by Anonymous in Astronomy & Space

1. In displacement vs. time graph, does it represent the period or the wavelength? If so, what represents the other?

2. The displacement of a string carrying travelling sinusoidal wave is given by y(x,t) = A sin (kx-wt+φ). At time t=0 the point at x=0 has a displacement of 0 and is moving in the +y direction. The phase constant φ may take the value of 180 deg. Why?

3. A source of frequency f sends waves of wavelength λ travelling with speed v in some medium. If the frequency is chaged from f to 2f, then the new wavelength and new speed will be? What is the formula/equation to use?
a. λ/2, v or b. λ, 2v

2007-08-23 22:58:00 · 2 answers · asked by MatT 7 in Physics

this is probably a basic question, but i was called to transfer the contents of a glass bottle from the ultrasound room to the tech center which held, i'm assuming, liquid from a patient via a standard thoracentesis procedure.

when i picked it up, the doctor told me to be extra careful with it; if i dropped it, it would implode because the bottle was in a vacuum-ous(?) state. i've heard of solid matter imploding, but not liquid. or, was he referring to the bottle itself imploding? i'm guessing that would make a lot more sense.

i was just wondering if anyone knew any more on this subject. i know the difference between an explosion and an implosion, but does anyone know what it would look like for a glass jar containing liquid to implode on itself?

2007-08-23 22:57:18 · 3 answers · asked by Iphgeniea 3 in Other - Science

What's the minimum that is considered vast majority?

2007-08-23 22:49:59 · 5 answers · asked by Anonymous in Mathematics

2007-08-23 22:48:31 · 11 answers · asked by Anonymous in Astronomy & Space

2007-08-23 22:38:43 · 2 answers · asked by seph 2 in Medicine

2007-08-23 22:30:55 · 15 answers · asked by Anonymous in Mathematics

it is the biggest i ever seen!! i hate them and cant concentrate! what if it comes in my office

2007-08-23 22:30:02 · 25 answers · asked by Anonymous in Zoology

Self explanatory question

2007-08-23 22:29:22 · 10 answers · asked by Analyst 2 in Biology

2007-08-23 22:24:01 · 14 answers · asked by Anonymous in Astronomy & Space

2007-08-23 22:15:16 · 7 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-23 22:15:07 · 7 answers · asked by Anonymous in Biology

Or milk of magnesia kind of substances

2007-08-23 22:10:37 · 3 answers · asked by scienceNiu 1 in Chemistry

2007-08-23 21:58:53 · 15 answers · asked by sharifjunaid 3 in Zoology

"Out-of-body experiences have fascinated mankind for millennia. Their existence has raised fundamental questions about the relationship between human consciousness and the body," said Henrik Ehrsson, a neuroscientist formerly of University College London, and now at the Karolinska Institute in Sweden.
http://news.yahoo.com/s/afp/20070823/ts_alt_afp/usscienceparanormal
http://www.heraldextra.com/index.php?option=com_content&task=view&id=235425&Itemid=99999999
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/08/24/MNHHRO66H.DTL&feed=rss.news
more;
http://news.search.yahoo.com/search/news?p=Out+of+body+experiences&fr=&ei=UTF-8

2007-08-23 21:56:02 · 5 answers · asked by kokopelli 6 in Paranormal Phenomena

Assume that a, b and c are positive integers.
Questions like this is not very easy to answer - as far as my math knowledge is concerned. :)

2007-08-23 21:55:40 · 6 answers · asked by John J 1 in Mathematics

The wind is the lack of air movement not the movement of it. There should always be a slight breeze, as the atmosphere follows a spinning earth, but it tilts different angles, along its eliptical orbit, the mountains/buildings push and the temperature of the ocean, causing warm rising swirls that become hurricanes/tornadoes... it seems an intellegent species on this same senario of planet, would have solar powered refrigeration units off the Carribean, so those swirls, would not even happen in the first place. Also a computer simulation of our "topgraphy's influenence" according to different angles/times.Refined correlation of data would advance predictability. Structures then placed at certain locations to smooth/cancel negative functioning results. Earth perpetually in a pleasant state, as we evolve into a "Team Human" populate the universe, logical best possibility chance for realization of existence experience as human, since we are recycled back into it, lets all stop the stupid.

2007-08-23 21:38:59 · 7 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-23 21:38:51 · 5 answers · asked by Anonymous in Chemistry

The ion particle are accelerated out the back of the space ship using a electrostatic grid. The ion particles are accelerated to a top speed of 100 000 km/h. If you are placing more electrostatic grids along the back of the engine, will the ion particles go faster then 100 000 km/h ?

2007-08-23 21:36:58 · 2 answers · asked by seeker 2 in Physics

2007-08-23 21:33:13 · 3 answers · asked by mohammad s 1 in Zoology

imagine theres a horizontal planeA bove which the effects of gravity are not felt. any object above the plane just floats and gravity has no influence on it.
now take a chain(for e.g:made of small steel ring) of length hundred metres above the planeA and arrange it so that its in a heap just above the planeA. but take care the chain is not entangled and should be easy to stretch along its length.

now pull the lower end of the thread below the planeA and the chain runs down like a single thread and hits the ground and as links pull down on the ones they are linked to , the whole length of the chain will run like a thread and hit the ground in some time. now take planeA is 20metres above the ground surface. the terminal velocity of links when they hit ground will be around 14 metres .
now consider hundred metres of the chain weighs 100 units. the potential energy of the chain just above the planeA will be m*g*h =100 *9.8*20
=19600 units.

2007-08-23 21:29:25 · 2 answers · asked by balaji.k 2 in Physics

2007-08-23 21:09:26 · 4 answers · asked by deepak_8584 1 in Engineering

2007-08-23 21:07:39 · 1 answers · asked by deepak_8584 1 in Engineering