Science & Mathematics - 25 September 2007

apperently theres a 12th planet which is going to kill us all is it true? (im 51% sure its fake)

2007-09-25 04:56:50 · 6 answers · asked by Ben M 1 in Astronomy & Space

If the Quadratic equation αx2 + βx + a2 + b2 + c2 – ab – bc – ca = 0 has imaginary roots, then

1. 2(α – β ) + (a-b)2 + (b-c)2 + (c-a)2 > 0
2. 2(α – β ) + (a-b)2 + (b-c)2 + (c-a)2 < 0
3. 2(α – β ) + (a-b)2 + (b-c)2 + (c-a)2 = 0
4. none of these

2007-09-25 04:53:36 · 3 answers · asked by Navalendu P 1 in Mathematics

I live in Northern Utah. Temperatures have dropped down 20 degree's. It's down right chilly at night. Furnace is already on and running. I think Winter is not far away. WE already have snow in the upper benches. Do you think we are in for a harsh winter?

2007-09-25 04:46:02 · 2 answers · asked by angelikabertrand64 5 in Weather

2007-09-25 04:45:02 · 9 answers · asked by surlygurl 6 in Physics

2007-09-25 04:38:43 · 4 answers · asked by student 1 in Mathematics

How can you do well on a test even if you dont get enough sleep?

2007-09-25 04:37:48 · 22 answers · asked by ? 1 in Biology

Can anyone explain to me about Bernoulli Principle?

2007-09-25 04:36:25 · 6 answers · asked by yie 1 in Engineering

My family has some interest in some property. The interest is divided as follows:

1/24 x 7/8 = .03645833 - $1455 appraised value my share
1/24 x 1/8 = .00520330 - $2358 appraised value rest of family's share
$3813 Total appraised value
The ownership is changing as follows:

1/24 x 1/4 = .01041667 for my share
1/24 x 3/4 = .03125000 rest of family's share
I need to reapportion the total appraisal of $3813 among the new figures. Can you give me the correct calculation, not just the answer? I have been pretty sick lately and can't seem to work this out in my head the right way.

2007-09-25 04:30:35 · 3 answers · asked by lavenderbluelassie 3 in Mathematics

2007-09-25 04:26:49 · 5 answers · asked by Anonymous in Biology

There a contest going that will require you to pick 2 bags (with winning certificates) out of 20. The other 18 bags are losers.

2007-09-25 04:23:00 · 7 answers · asked by Jennield 6 in Mathematics

what are the 3 co ordinates of f(x)=x(x-4)(x+2)....

i know that the 3 co ordinates of, say, f(x)=(x-2)(x-3)(x-1) are 2, 3, and 1. But I'm not sure when there aren't 3 set brackets like in the question.

Thanks

2007-09-25 04:20:50 · 5 answers · asked by jenny 1 in Mathematics

2007-09-25 04:20:48 · 6 answers · asked by fishburn7 2 in Mathematics

2007-09-25 04:15:38 · 5 answers · asked by shell 1 in Chemistry

what number plugged into e^x gives you 0?

2007-09-25 04:11:58 · 4 answers · asked by fishburn7 2 in Mathematics

(a) A circle has radius 2cm (in that circle there is an triangle AOB) and the chord AB has length 3cm. AO is 2cm and BO is 2cm. O is the centre of the circle.

(b) consider a paper disc whose boundary is the circle in part (a). The sector AOB is removed from the paper disc and the remaining paper is bent round to form a shallow cone by joining the edge OB to the edge OA.

(i) Which arc becomes the circle that is at the base of the cone? Find the angle subtended by this arc in the original circle (in radians), and hence find the length of the arc.

(ii) Hence find the radius of the circle that is at the base of the cone.

(iii) Find the perpendicular height of the cone.

(iv)Given that the formula for the volume of a cone is
V = 1/3 pie r^2 h
(Where r is the radius of the base and h is the perpendicular
Height), find the volume of the cone in this question.

2007-09-25 04:10:56 · 1 answers · asked by Anonymous in Mathematics

I missed a day and now I'm a little behind. I have an idea of how to do these, but I just want to make sure I'm right before I spend 2 hours doing a whole page of them.

1) A balloon rises at the rate of 8 feet per second from a point on the ground 60 feet from an observer. Find the rate of the angle of elevation when the balloon is 25 feet above the ground.

2) The height of a cylinder with a radius of 4 cm is increasing at a rate of 2 cm/min. Find the rate of change of the volume of the cylinder when h=10 cm.

2007-09-25 04:10:50 · 3 answers · asked by Anonymous in Mathematics

2007-09-25 03:58:54 · 11 answers · asked by Anonymous in Zoology

And no, I don't plan on strapping them to a lawn chair and going airborne.

Just curious.

2007-09-25 03:57:27 · 4 answers · asked by opjames 4 in Astronomy & Space

2007-09-25 03:54:09 · 5 answers · asked by Winifred D 2 in Biology

Just to clarify a prior question, I had; I've heard that ionized air can be potentially harmful (i.e. free radicals) so I want to avoid air cleaners that ionize air. The 3M Filtrete electrostatic polyolefin-based filters (very common in furnace filters, and now as part of a standalone air purifier) are pre-charged with a static charge to attract dirt, dust, and particles of inflowing air.

My question is, as non-ionized (regular) air travels through the filter (via a simple fan, there is no ionizer involved) is there any way that it could pick up any of the charge on the electrostatic filter, or that the air can become somewhat ionized in any way or form after it leaves the filter? Now, AFAIK, air doesn't conduct charges well, so my guess would be no, but I'd like to have an expert opinion.

2007-09-25 03:51:36 · 3 answers · asked by Joe Jevers 1 in Engineering

a. annelida
b. arthropoda
c. mollusca
d. echinodermata
e. nematoda

2007-09-25 03:50:33 · 5 answers · asked by Mike G 1 in Biology

1. x:[0,2] dx / (2x+5)
2. x:[1, e^6] dx / xsqrt(lnx)
3. x:[8,21] (e^x^(1/3)) / x^(2/3)

2007-09-25 03:50:15 · 4 answers · asked by simonkf2002 1 in Mathematics

The medical thermometer commonly used in homes can be read +/-0.1 F, whereas those in the doctor's office may be accurate to +/- 0.1 C. in degrees Celsius, expres the percent error expected from each of these thermometers in measuring a person's body temperature of 38.9 C

2007-09-25 03:48:18 · 1 answers · asked by Anonymous in Chemistry

A ski resort is installing tows on its new ski runs. One hill has a vertical height of 500.0 metes and it is inlcined at 42 degrees.
Determine the approxmate length of the t-bar cable if it goes to the top of the hill and returns.

I am having trouble getting a diagram ,and having trouble solving this please help!!!

2007-09-25 03:45:55 · 5 answers · asked by Anonymous in Mathematics

2007-09-25 03:43:24 · 3 answers · asked by coolbunty_87 1 in Engineering

SCIENCEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

2007-09-25 03:43:12 · 4 answers · asked by Anonymous in Botany

a. 5y + 20 =
b. 7x - 28 =
c. 8a + 10b - 18c =
d. 9a + 27b + 81 =

I'm not sure how to set it up

2007-09-25 03:42:20 · 6 answers · asked by Tiffany S 1 in Mathematics

what can you tell me about distance and displacment and do u know any websites about it?

2007-09-25 03:40:52 · 3 answers · asked by Sara *Life is so unlike theory* 5 in Physics

2007-09-25 03:33:40 · 3 answers · asked by reshma p 1 in Mathematics

radical of(x-1) + radical of(y-2) + radical of(z-3) + 5.25 = x+y+z
i need to find out x, y and z

yeah... im not american or english and i hope i wrote it correctly 'radical of' cause i dont know how to make the symbol on a keyboard...

2007-09-25 03:29:41 · 3 answers · asked by paolomoldovan789 2 in Mathematics