Science & Mathematics - 25 August 2007

x^2/9-y^2/81=1

2007-08-25 06:03:10 · 2 answers · asked by Anonymous in Mathematics

A small light fixture is on the bottom of a swimming pool, 0.50 m below the surface. The light emerging from the water forms a circle on the still water surface. What is the diameter of this circle?

________m

2007-08-25 06:00:50 · 1 answers · asked by Anonymous in Physics

2007-08-25 06:00:13 · 11 answers · asked by need2noplz 1 in Mathematics

is 5 or less

2007-08-25 05:57:23 · 5 answers · asked by Anonymous in Mathematics

I need to find a topic for a written report, and it needs to be about a new discovery, or a new thing made thanks to biology or any of its sub-categories, like biotechnology, etc. Any ideas or suggestions? Thanks in advance.

2007-08-25 05:52:46 · 2 answers · asked by metalheart210 1 in Biology

|1 0 4| |1 0 4|
|3 0 9| = k |3 0 9|
|5 5 20| |5 5 20|

2007-08-25 05:47:48 · 2 answers · asked by Anonymous in Mathematics

As we neared the end of the flight we flew over what I believe was one of the great lakes. Does anyone happen to know what lake that might have been? I'm thinking Lake Erie? Also saw a snaking type river that seemed to flow from the lake could that have been the Erie canel? It would be wonderful if the Airlines would announce as they are flying over landmarks of interest. I know they are busy flying the plane but a little commentary would be nice. The east coast is just beautiful from the air.

2007-08-25 05:47:06 · 3 answers · asked by shirl 3 in Geography

pls help

2007-08-25 05:45:43 · 6 answers · asked by Anonymous in Chemistry

2007-08-25 05:44:39 · 8 answers · asked by Anonymous in Astronomy & Space

7 4
5 4

2007-08-25 05:44:29 · 2 answers · asked by Anonymous in Mathematics

If i go from Dammam to Abha directly in a car?

2007-08-25 05:39:39 · 3 answers · asked by raza5sa 3 in Geography

solve the system of equations algebraically

y=x^2-2x-3
y=x+1

2007-08-25 05:39:05 · 4 answers · asked by Anonymous in Mathematics

A spherical balloon with radius r inches has volume defined by the function below. Find a function that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r + 2 inches.

I took V(r)=4/3pi(r+2)^3 and subtracted it from the orignal formula V(r)=4/3pir^3 now do the 4/3pi cnacel each other out? leaving me with 6r^2+12r+8? or do you just subtract the (r+2)^3 from r^3 leaving you with 8pir^2+16pir+(32/3pi)?

2007-08-25 05:38:39 · 1 answers · asked by m_carl 1 in Mathematics

2007-08-25 05:31:30 · 8 answers · asked by shawna 2 in Mathematics

If so I am interested in your opinion of climate change, man or nature etc

2007-08-25 05:31:03 · 20 answers · asked by willow 6 in Earth Sciences & Geology

Suppose you are given the formula (y+3)/4 = ± (x+2)/9 for the asymptotes of a hyperbola. What is the formula for the hyperbola?

A You can’t tell because when you square both sides you might introduce extraneous roots.
B (y+3)^2/16 – (x+2)^2/81 = 1
C (y+3)^2/4 – (x+2)^2/9 = 1
D (x+2)^2/81 – (y+3)^2/16 = 1
E (x+2)^2/9 – (y+3)^2/4 = 1
F You can’t tell because you don’t know whether it opens to the sides or up-and-down.

2007-08-25 05:29:04 · 2 answers · asked by Anonymous in Mathematics

If it's not a black hole then what is it?

http://www.unexplained-mysteries.com/viewnews.php?id=103877

2007-08-25 05:27:01 · 13 answers · asked by Anonymous in Astronomy & Space

the earth went into total darkness? Would we freeze in a matter of seconds? or would we live in fear and lonely panic for a day or so?

2007-08-25 05:24:39 · 4 answers · asked by Anonymous in Astronomy & Space

I something was eating my tomato plant, since I saw only stumps of the leaves remain on the vine. And when I saw this gigantic green caterpilar that's almost as long and thick as my finger(I am a grown person), I almost fainted.

What on earth is this???

2007-08-25 05:21:48 · 6 answers · asked by Anonymous in Biology

2007-08-25 05:21:40 · 15 answers · asked by Anonymous in Mathematics

Equation #1 =
-u^2 = 6 + 7u

Equation #2=
-((2x+1)/x) = 6+7( sqrt ((2x+1)/x))

Solve for x.
(notice that equation 2 is equation 1 when sqrt ((2x+1)/x) is substituted for u)
(i got that "u"= -6,-7 and then i set it equal to sqrt ((2x+1)/x) but it doesn't work out... please help!)

2007-08-25 05:21:33 · 4 answers · asked by dunnohow 4 in Mathematics

Do stars appear to move clockwise or counterclockwise around the north celestial pole? If you lived in Australia and were looking at the south celestial pole, would your answer be any different?

2007-08-25 05:20:48 · 2 answers · asked by ChEMIsTrY ChICkiE 1 in Astronomy & Space

when a body of mass m moves up on an incline plane of angle A through a distance s show that the work done against the friction is umgcosA.s where u is the coeficient of friction of plane

2007-08-25 05:09:43 · 3 answers · asked by sameerteacher01 1 in Physics

Now Imagine theres a point 'A' vertically above the surface of earth. the distance of point A from the horizontal plane is given by X metres .also, imagine theres no atmosphere.

Now Imagine from within that point A , a chain {made of identical oval shaped rings linked sequentially} keeps on appearing {materializing}

and it starts to fall down due to gravity and hits the ground.the liks which appear from within point A are static and are pulled down by the links below them i.e., the faster you pull the faster the new links materialize. now what will be the velocity of the chain { particularly the rings} when they hit the ground if X = 20 metres .(remember the chain keeps on materializing from the point A}.

i think the terminalvelocity of the chain can be given by Vt = squarerootof (Xg)

where g = acceleration due to gravity(take g= 10 m/s^2).
now sqrroot of(20*10) = 14.14.so , here Vt = 14.14.

2007-08-25 05:07:55 · 3 answers · asked by balaji.k 2 in Physics

2007-08-25 05:07:44 · 9 answers · asked by Anonymous in Medicine

2007-08-25 05:07:29 · 8 answers · asked by Sheri 1 in Astronomy & Space

a block of mass 2 kg is kept on a rough inclined plane of inclination 30 fixed in an elevator. the elevator starts to come down with an acceleration of 2ms and block remains at rest on the incline. whate is the work done by the normal force acting on the block in 4 second
answer 96 j

2007-08-25 05:04:44 · 3 answers · asked by sameerteacher01 1 in Physics

How could you show the presence of both the carbonate and the chloride ions in this mixture....?

as you can see im not very good at chemistry if some one can help...thanks =)

2007-08-25 05:04:37 · 4 answers · asked by Anonymous in Chemistry

are aliens real i have seen tv documentrys and they say they have seen aliensa but i don't now wat to belive i need help please!
do they exsist??

2007-08-25 05:04:27 · 27 answers · asked by mehreen 2 in Astronomy & Space

I want to actually be able to get a good look at stars, planets, cosmos, etc. If I pay in the 200-500 range, can I expect that? Or will I merely be seeing a one centimeter circle we call the moon? Can anyone recommend a certain type, or anything at all? Thanks

2007-08-25 05:03:01 · 7 answers · asked by mj.obrien 1 in Astronomy & Space