Science & Mathematics - 28 January 2007

2007-01-28 04:12:58 · 3 answers · asked by linifer74 1 in Earth Sciences & Geology

2007-01-28 04:12:55 · 6 answers · asked by Anonymous in Physics

2007-01-28 04:10:37 · 11 answers · asked by thesupergothshow 1 in Medicine

y = radical (4 - x^2)?

I do not know at all :( I know the correct answer is supposed to be
(- infinity, 2]

2007-01-28 04:10:36 · 4 answers · asked by Anonymous in Mathematics

1.a,b,c are three numbers and their scales is from 0 to 9;
2.a,b,c could be the same;
3.(a+b+c)must be 12 or 13 or 14or 15.
who can tell me how many permutions are there and give me the outputs!

and
1.a,b,c,d e are five numbers and their scales is from 0 to 9;
2.a,b,c,d,e could be the same;
3.(a+b+c+d+e)must be 21 or 22 or 23 or 24 or 25.
who can tell me how many permutions are there and give me the outputs!

2007-01-28 04:09:26 · 4 answers · asked by fred 1 in Mathematics

During nuclei fission, large nuclei with high masses are split into two nuclei with smaller masses. During nuclear fission, two nuclei with low masses are combined to form one nucleus of larger mass. How are the two processes similar? ( i hate "think critically" questions)

2007-01-28 04:08:17 · 3 answers · asked by YYYpunk 3 in Physics

DNA is found in:

a. prokaryotic cells only
b. eukaryotic cells only
c. both prokaryotic and eukaryotic cells
d. none of the above

2007-01-28 04:07:47 · 2 answers · asked by shane200388 1 in Biology

2007-01-28 04:07:35 · 5 answers · asked by snitta 1 in Other - Science

2007-01-28 04:07:34 · 3 answers · asked by Phoyos 1 in Earth Sciences & Geology

AHHHHHHHH!!! After asking several people I haven't been able to figure out this simple algebra for my calculus class... so how do I isolate x?

[(4x-3)/(2x+1)]=y

2007-01-28 04:07:18 · 4 answers · asked by Anonymous in Mathematics

2007-01-28 04:06:27 · 9 answers · asked by Anonymous in Zoology

What would happen If I took thirty multivitamin tablets in one day ?

2007-01-28 04:04:03 · 15 answers · asked by Anonymous in Medicine

2007-01-28 04:03:49 · 9 answers · asked by devan d 1 in Astronomy & Space

the issues that our own Government and Nasa fabrocated the first landing on the moon. How do you feel about these issues and do you think man actually landed on the moon? There are alot of pro's and con's on this issue.

2007-01-28 04:03:10 · 5 answers · asked by shuggabhugga05 4 in Astronomy & Space

2007-01-28 03:59:30 · 6 answers · asked by Anonymous in Engineering

2007-01-28 03:59:19 · 15 answers · asked by Anonymous in Physics

what kind of rock is the grand cayon like: Metamorphic, Igneous or sedimentary?

2007-01-28 03:59:17 · 5 answers · asked by Phoyos 1 in Earth Sciences & Geology

Estimate the asymptotic efficiency of a rocket (or other launch vehicle - Saturn V, Delta, Ariane, Space Shuttle, whatever). A rough estimate would be ok.

As in: what proportion of the total chemical energy in the fuel at launch is ultimately converted into gravitational potential energy + kinetic energy of the launch vehicle/payload?
(To get that PE I expect you integrate Newton's Law of Gravitation, from ground to final altitude, using only the mass of the payload. To get the KE you need to know the final velocity components - is that radial and tangential to the earth orbit?)

For a bonus, what was the single biggest cause of inefficiency, and can you quantify it? (I think it is lifting your own fuel, followed by air resistance)

(I don't just mean the engine efficiency of the engine, I mean the whole deal.)

(Not sure where to put it - this question is a little chemistry, a little physics and a little astronomy)

2007-01-28 03:56:50 · 1 answers · asked by smci 7 in Other - Science

For those floridians, we will be waking up with temperatures between 27-49 degrees depending on where you are in the state. 27 degrees in North Florida and temperatures as low as 49 or lower in Miami expected. Those in the middle of the state varies. What are your thoughts?

2007-01-28 03:54:24 · 5 answers · asked by Justin 6 in Weather

Sally is a surveyor in the badlands in South Dakota. At point A on the south side of a deep canyon, she sights across to a fire tower on the north side of the canyon at point B. Then she moves a measured 500 feet along the south rim of the canyon to a point C on a line perpendicular to her original sight line AB. Setting up her transit again, she finds that her line of sight, CB, to the tower is 84 degrees. Correct to the nearest whole foot, how far is point C from the tower?

2007-01-28 03:52:48 · 3 answers · asked by Olivia 4 in Mathematics

Do you think that it is possible, for life to exist on Mars? Why or why not?

2007-01-28 03:50:24 · 10 answers · asked by kristine 2 in Astronomy & Space

Or was it artificially orchestrated in an attempt to intimidate the Soviet Union, who was the first nation to put a human into space?
What do you think, and why?

2007-01-28 03:50:23 · 11 answers · asked by Great Dane 4 in Astronomy & Space

Can someone give me some websites that helps kids with homework mainly with pre algebra?

2007-01-28 03:49:38 · 4 answers · asked by Anonymous in Mathematics

What mappingrule describes the transformation of graph 1 onto graph 2?

Graph 1's points are: (0,0),(-1,1),(1,1),(-2,4)(2,4)
Graph 2's points are:(-6,3)(-8,3)(-7,-5)

(x,y) --> (x+5, -1/2y - 7)
(x,y) --> (x+5, -2y + 7)
(x,y) --> (x-7, -1/2y - 5)
(x,y) --> (x-7, -2y + 5)

How exactly would you figure it out? Any help?

Also: for domain and range of a function (not related to the above question), what is the easiest possible way to find the domain, range, or both, to a function? How would you write it? Thanks :)

2007-01-28 03:49:06 · 1 answers · asked by Anonymous in Mathematics

year10 group year 11 group
boys 75 50
girls 60 30

above, shows the number of boys and the number of girls in year10 and year11 of a school.
The headteacher wants to find out what pupils think about a new year 11 common room. A stratified sample of size 50 is to be taken from year 10 and year 11.

a) calculate the number of pupils to be sampled from year 10.

two pupils are to be chosen at randon to speak to the headteacher.

one pupil is to be chosen from year 10.
one pupil is to be chosen from year 11.

b) calculate the probability that both pupils will be boys.

however, the headteacher decides to choose one boy at random from all the boys in year 10 and 11 together and one girl at random from all the girls in year 10 and 11 together.

c) calculate the probability that exactly one of the pupils will be from year 10.

2007-01-28 03:48:33 · 1 answers · asked by jenny 1 in Mathematics

a diagram shows a rectangle with length x+4 and width x-1.
the area of the rectangle is 'A' square cms.
therefore A=x^2+3x-4

When A=10, x satisfies the equation x^2+3x-14=0.
Find the length of the rectangle.

2007-01-28 03:46:21 · 2 answers · asked by jenny 1 in Mathematics

we could be ready if we had large buildings conected to atomic reactors for powering large where hoses of plants that would be grown with lights and underground wells could provide water we could have living quarters this could be done on a large scale every city could be connected empty buildings in cities could provide the facility what do think could this work

2007-01-28 03:45:27 · 3 answers · asked by Anonymous in Astronomy & Space

I cant seem to find where it was found. My project is due tommorow! Can someone please tell me the place, and if you can find it, a photo, of Argon. THANKS!!!! :)

2007-01-28 03:43:40 · 5 answers · asked by lol4lisa 1 in Earth Sciences & Geology

Find the volume of the solid obtained when the region bounded by the curves y = squareroot(x) and y = x is rotated around the line y = 2.

I got a volume of pi/2.

I was wonder if anyone could confirm this with me. Thank you!!!

2007-01-28 03:42:57 · 4 answers · asked by Johnny O 1 in Mathematics

arrow, starting from rest, leaves the bow with a speed of 28.5 m/s. If average force on the arrow by the bow were doubled, all else remaining the same, what speed would the arrow leave the bow?


i'm completely lost by this problem........

2007-01-28 03:41:10 · 6 answers · asked by imjustmewhatelseshouldibe 1 in Physics