Science & Mathematics - 21 November 2007

2007-11-21 11:18:46 · 15 answers · asked by ? 2 in Weather

Could any one tell me if LVEF- which is Left Ventricular ejection fraction. If this was low would it cause the left side lower extremities feel num, have a burning sensation in the left shoulder and neck and lower chest cavaty on the left side. all this with a blood presure of 117 over 80 also I have diabetes type 1?

2007-11-21 11:04:44 · 2 answers · asked by jimmy s 1 in Medicine

http://news.yahoo.com/s/afp/20071121/sc_afp/nirelandbritainanimalsfish

BELFAST (AFP) - Northern Ireland's only salmon farm was completely wiped out by a freak jellyfish attack, the owners said Wednesday.

ADVERTISEMENT

More than 100,000 fish worth more than one million pounds (2.1 million dollars, 1.4 million euros) were killed in the invasion at Glenarm Bay and Red Bay, on the County Antrim north-east coast.

We are still assessing the full extent, but it's a disaster," said John Russell, managing director of Northern Salmon Co. Ltd.

"In 30 years, I've never seen anything like it. It was unprecedented, absolutely amazing. The sea was red with these jellyfish and there was nothing we could do about it, absolutely nothing.

"I have never experienced such concentrations of jellyfish spread over such a wide area. The vastness was unbelievable."

The seven-hour attack over Tuesday and Wednesday last week saw the jellyfish covering a sea area of up to 10 square miles (26

2007-11-21 11:01:46 · 11 answers · asked by J7 3 in Paranormal Phenomena

I recently performed an amino acid experiment with chromatography paper using a mixture of ethanol, ammonia and water as the solvent in a ratio of 8:3:1. Individually the substances are polar, but are they polar mixed? is it a mixture or compound now?

2007-11-21 10:59:59 · 1 answers · asked by jabohio 2 in Chemistry

2007-11-21 10:59:46 · 1 answers · asked by meow 1 in Chemistry

Solid ammonium chloride is added to water in a beaker and dissolves. The beaker becomes cold to the touch.
a. Make an appropriate choice of system and surroundings and describe it unambiguously.
b. Explain why you chose the system and surroundings you did.
c. identify transfers of energy and material into and out of the system that would be important for you to monitor in your study.
d. Is the process of dissolving NH4Cl solid in water exothermic or endothermic?

2007-11-21 10:54:15 · 3 answers · asked by loone 2 in Chemistry

the measure of the vertex angle of an isosceles triangle is 76 degrees. find the measure of the base angle?

how would you do this?

also help with this equation?

solve for x: 2/5x - 7= -3


please and thanks!

2007-11-21 10:51:03 · 1 answers · asked by nala 4 in Mathematics

1. Give an example of an open cover of (-1, 1] which does not have a finite subcover.

2. Give an example of a function f: (A U B)-->R such that f is uniformly continuous on A and B but not on (A U B). U denotes union and R denotes the set of real numbers.

3. Give an example of two uniformly continuous functions f,g : D -- > R such that f*g is not uniformly continuous. R denotes the set of real numbers.

2007-11-21 10:47:19 · 1 answers · asked by Gabe 3 in Engineering

A playground merry go round of radisu 2.15 m has a moment of inertia 245 kg. m^2 and is rotatings at 5.6 rev/min about a friction-less vertical axle. Facing the axle, a 21.3 kg child hops onto the merry go round, and sits down on the edge.
What is the new angular speed of the merry go round? Answer in units of rev/min
if anybody do that please reply at manon457@yahoo.com

2007-11-21 10:44:34 · 1 answers · asked by manon 1 in Physics

if electricity costs .09 per kilowatt hour, how much does it cost per megajoule?

2007-11-21 10:44:27 · 1 answers · asked by loone 2 in Chemistry

Ive been trying forever and I cant get the answer. If anyone knows how to work this out, please feel free to help out. Also, Please explain how you did it so can understand how to do it. Thanks!

If Jack and Jill each flip a coin three times, what is the probability they will get the same number of heads?

2007-11-21 10:44:12 · 1 answers · asked by Richard 1 in Mathematics

A rancher wants to fence in an area of 3,200,000 square feet in a rectangular field and then divide it in half with a fence down the middle parallel to one side. What is the shortest length of fence that the rancher can use?

2007-11-21 10:42:20 · 4 answers · asked by joe j 2 in Mathematics

2007-11-21 10:41:47 · 5 answers · asked by bbygurl09 1 in Mathematics

it seems like we only see the stars around us...wat about beneath us? I kno its not hell..but wat is under

2007-11-21 10:41:28 · 14 answers · asked by Anonymous in Astronomy & Space

2007-11-21 10:39:37 · 3 answers · asked by timz11 1 in Mathematics

Which of the following is not true of an isosceles triangle?

A. It has a base that is opposite a vertex angle.

B. The measure of a base angle and the measure of its vertex angle can never be equal.

C. The sides opposite its base angles are congruent.

D. The angles opposite its legs are congruent.

2007-11-21 10:38:32 · 3 answers · asked by x j 1 in Mathematics

just thinking if they can other stars and all that..then why not direct the Telescope at a planet like mars?

2007-11-21 10:38:27 · 5 answers · asked by Anonymous in Astronomy & Space

2007-11-21 10:37:25 · 5 answers · asked by Anonymous in Botany

2007-11-21 10:35:17 · 8 answers · asked by Anonymous in Mathematics

2007-11-21 10:34:22 · 9 answers · asked by clue2 1 in Geography

x-2y=1
x^2+y^2=29

without a calculator i really cannot do this totally and find x and y. I found y=-0.4 plus or minus SQRT(-544) which is impossible atleast i thought.

Any ideas, i would usually get these straight away but really cannot today. This is in an AS level C1 exam from May 2005, so no calculator and it obv can be done, using the knowledge available to people at that point in the AS level course.

2007-11-21 10:31:22 · 10 answers · asked by Anonymous in Mathematics

2007-11-21 10:27:29 · 6 answers · asked by Smudge 3 in Zoology

How much energy is required to change a 42g ice cube from at -11C to steam at 111C?

2007-11-21 10:23:16 · 2 answers · asked by summersun 1 in Physics

are there proofs to support it. any sites you can recommend related to this topic? thanks

2007-11-21 10:22:13 · 6 answers · asked by airUbreathe 2 in Astronomy & Space

If water in a sealed, insulated container is stirred, is its temperature likely to increase slightly, or decrease slightly, or stay the same? Explain your answer.

Given your answer to the above statement, why does stirring a hot coffee cool it down?

2007-11-21 10:21:56 · 3 answers · asked by summersun 1 in Physics

If you cannot answer that question, then I would be satisfied with just the antiderivative of (sin x)^2

2007-11-21 10:17:30 · 5 answers · asked by B.B. 3 in Mathematics

I'm doing a rpoject on how plants never get sunburned. I read an article that said that plants have this enzyme called the scissor which undo gene damage from UV rays. Does anyone know anything about that?

2007-11-21 10:12:15 · 4 answers · asked by Sheelan Y 1 in Botany

x/((x+1)(x+3))+(x+12)/(x^2-9). EXpress it as a single fraction in its simplest form. show all working

2007-11-21 10:11:22 · 5 answers · asked by pearls3212 4 in Mathematics

A poster is to contain 120 square cm of printed matter, with margins of 5.5 cm each top and bottom and 1.5 on each of the sides. Find the minimal cost of the poster if it is to be made of material costing 18 cents per square cm.
The minimal cost in dollars is_______???

2007-11-21 10:11:05 · 2 answers · asked by joe j 2 in Mathematics

1+1=
seriously.......help?

2007-11-21 10:10:09 · 11 answers · asked by laffy-taffy 3 in Mathematics