Science & Mathematics - 25 August 2007

1. The soln of 9Xsquare+30x+25=0 is a ______set.
Means Singleton, Infinite or Null?
2. If H.C.F of p(x) and q(x) is 1, what's their L.C.M?
3.For what value of discriminant D, quadratic equation doesnot have real root?
4.By which number the sum of a two digit number and number obtained by interchanging it's digits is always divisible?
5.The sum of digits of a two-digit number is same as product of it's digits. Then, the number is_______. i.e. a.11 b.23 c.10 d. 22

2007-08-25 03:40:56 · 8 answers · asked by Anonymous in Mathematics

Why is the Black Widow Spider so called? Please answer in very explainatory manner...please!

2007-08-25 03:38:20 · 6 answers · asked by rox 1 in Zoology

what would the balanced equation be??
i got 7O2 + 14 H2 yeilds 14 H2O
but could i use O2 + 2 H2 yeilds 2 H2O?
the next question is what is the limiting reactant

2007-08-25 03:34:42 · 5 answers · asked by Christine 2 in Chemistry

2007-08-25 03:33:38 · 6 answers · asked by Anonymous in Earth Sciences & Geology

like how many spaces to move the decimal and stuff? with examples? thanks soooo much!

2007-08-25 03:33:37 · 3 answers · asked by ineedmathhelppeas 1 in Mathematics

when dividing exponents do you subtract them?

2007-08-25 03:23:34 · 4 answers · asked by xrandomnessx 2 in Mathematics

Plz. Help me in finding out Project Management Course in mumbai for Mechanical Engineer.

2007-08-25 03:10:26 · 3 answers · asked by Hemant Kumar 1 in Engineering

theta^3/3!

what does the explanation point mean in the above fraction?

2007-08-25 03:08:00 · 2 answers · asked by RogerDodger 1 in Mathematics

humans aren't able to go deep enough underwater because the weight will crush the machines or and will possibly lose reception if it's wireless.

there are many species down there that we have yet to discover. what if there are species down there that are as intelligent as us, with creativity and such. and to them, they cannot go up here to the surface because the weight of the water supports their body, or they die from oxygen up on earth. and they do not float so if they die, they stay down there, or if they die, their body will somehow decay and vanish before it reaches the surface.

anything is possible down there, what is down there? we do not know yet. but someday if we manage to get so deep down there, maybe there are species as smart as us. maybe they will look like us but with fins. maybe they will reach us before we reach them. who knows? maybe they've developed technology down there like atlantis technology. maybe theres magic down there. who knows.

what do you think?

2007-08-25 03:06:33 · 4 answers · asked by Dave 3 in Earth Sciences & Geology

There have been suggestions that there is such a thing as the male menopause, so haven't they then got a 'time of the month'? (e.g. a monthly cycle of their hormones that changes their 'performance' generally. Tiredness/increased agitation/increased sweating/clumsiness/ decreased coordination/spots etc. Not sure what to suggest really!)
Men, have you noticed anything about yourselves that would suggest this is true?
I know Women's cycles are for the purpose of preparing the womb for pregnancy. And so the male cycle would not be for reproduction purposes, but is there such a 'thing'?

2007-08-25 03:00:38 · 13 answers · asked by Anonymous in Other - Science

Only serious answers, please.

2007-08-25 02:47:25 · 4 answers · asked by Pie 3 in Astronomy & Space

1. A stone is thrown horizontally at a speed of 5m/s from the top of a cliff 78.4m high.

a) How long does it take the stone to rech the bottom of the cliff?

b)How far from the base of the cliff does the stone strike the ground?

c) What are the horizontal and vertical components of the velocity of the stone as it hits the ground?

d) What is the final speed of the stone as it hits the ground?
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2. How would the answers to a,b,and c change:

a) If the stone were thrown with twice the horizontal speed? (Explain)

b) If the stone were thrown with the same speed but the cliff were twice as high? (Explain)

2007-08-25 02:42:31 · 4 answers · asked by boy101 3 in Physics

2007-08-25 02:39:25 · 2 answers · asked by paradkar_2000 1 in Chemistry

I don't know what wrong i've done,I can't get the right answer for these.

1) Use the expansion of (2-x)^5 to evaluate (1.98)^5 .

2) The first term of an arithmetic progression is a and the common difference is d. If the 5th, 9th and 16th term form a three term geometric progression with common ratio r, find the value of d in terms of a.

2007-08-25 02:37:33 · 3 answers · asked by aMused 2 in Mathematics

Is it scientifically feasible that the guy was perfectly fine in 2001 A Space Oydssey when he was without a helmet for a few seconds in deep space?

2007-08-25 02:34:00 · 16 answers · asked by Parker128k 2 in Astronomy & Space

2007-08-25 02:33:34 · 4 answers · asked by secret 1 in Earth Sciences & Geology

Against between these two phenomena and Neumena, which one is powerful ?

2007-08-25 02:24:05 · 4 answers · asked by skylarks_25 3 in Other - Science

2007-08-25 02:20:18 · 4 answers · asked by secret 1 in Earth Sciences & Geology

I was looking up UFOs or Aliens and I found about this guy who was with the CIA or FBI and had a speech about Aliens and UFOs and everything he saw while working with the CIA or FBI and I remember seeing his Speech on You Tube but I can't find it and I don't remember his name
he was overweight and white thou
oh and he killed himself like a week or so after that
and everyone is saying the government killed him
anyone know what I'm talking about?

2007-08-25 02:12:02 · 2 answers · asked by William S 1 in Paranormal Phenomena

2007-08-25 02:05:06 · 8 answers · asked by pete the pirate 5 in Astronomy & Space

How hot is a / an :
Sun's Core
Animal that's hibernating
Refrigerator
Match Stick that just light up

And how did they measure it??

2007-08-25 02:01:00 · 2 answers · asked by Kenny 1 in Physics

2007-08-25 01:58:55 · 2 answers · asked by secret 1 in Earth Sciences & Geology

we arestudying compressibility with different states of matter so.....

Explain why AIR is used to inflate tyres...
and
Explain why STEEL is used to make railways..

i need "science like" answers...

PLEASE HELP THANKS!

2007-08-25 01:51:57 · 4 answers · asked by Anonymous in Physics

Binomial expansion:

Use the expansion of (x+y)^4 to evaluate (1.03)^4 .

2007-08-25 01:49:18 · 7 answers · asked by aMused 2 in Mathematics

2007-08-25 01:45:12 · 2 answers · asked by ibmzee 1 in Chemistry

2007-08-25 01:39:34 · 4 answers · asked by gaara35 1 in Earth Sciences & Geology

My mind is going blank this morning as I try and finish my overdue homework!! Please walk me thru a couple problems using the Addition Method..

1) x+y=1
2x-y=5

2) x-2y=7
3x-2y=9

3) 4x-8y=5
8x+2y=1

4)3x+6y=7
2x+4y=5

5) 3x-4y=0
4x-7y=0

THANKS A MILLION FOR ANY HELP!

2007-08-25 01:33:24 · 7 answers · asked by ♥ ღAngelicaღ♥ 2 in Mathematics

2007-08-25 01:33:10 · 31 answers · asked by danjambo 2 in Geography

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 01:29:44 · 1 answers · asked by balaji.k 2 in Physics

Hey if u could explain these to me:

1) "Lisa finds that when she increases the voltage across an ohmic resistor from 6 V to 10 V the current increases by 2 A.
What is the resistance of this resistor?"
OK so if u work out the gradient that's 4/2 = 2. The answer gives 2 ohms, but isn't resistence the inverse of the gradient, so it should be 1/2 ??

2) The resistance of a certain piece of wire is found to be 0.8 ohm. What would be the resistance of a piece of wire of twice the diameter?
if it's twice then shouldn't u do 0.8/2 = 0.4? But my book says it's 0.2 ohm.

2007-08-25 01:29:13 · 6 answers · asked by Anonymous in Physics