Science & Mathematics - 17 November 2007

2007-11-17 07:28:29 · 14 answers · asked by Anonymous in Mathematics

2007-11-17 07:21:00 · 5 answers · asked by Scythian1950 7 in Mathematics

prove or disprove
every group of prime order is cyclic

2007-11-17 07:19:34 · 2 answers · asked by Dana S 1 in Mathematics

f(x,y)= e^(-x^2)(y^2+1)

i got fx= =2xe^(-x^2)(y^2+1)
fy=2ye^(-x^2)

my problem is solving the equations and getting the critical points. Also, how can we get y in terms of x to solve the equation???

help much appreciated

2007-11-17 07:18:52 · 1 answers · asked by xoom 2 in Mathematics

Is water unique in having its solid form less dense than its liquid?

2007-11-17 07:18:45 · 4 answers · asked by Ptericytol 1 in Chemistry

i need th proof for it. and make sure u know that all that stuff is on the bottom and only dx is in the numerator

2007-11-17 07:18:23 · 3 answers · asked by Pika 4 in Mathematics

4x2-2x-10=0

solve by completing the square.... thank you so much.

2007-11-17 07:17:35 · 3 answers · asked by Smart S 2 in Mathematics

or 1 mertic ton

2007-11-17 07:14:38 · 3 answers · asked by dylan h 1 in Mathematics

Find two values (c) lying on (-2,2) that satisfy the conclusion of MVT (i.e. x = 0)

My answer:
f'(x)= -8x^3+7x
f(-2) = -30
f(2) = -18

so, -18 - (-30) = -8x^3+7x(2 - (-2))
-48 = -32x^3+28x

But I only get one zero and I think I messed up in the equation somewhere. Please advise :)

2007-11-17 07:13:29 · 2 answers · asked by John Avry 2 in Mathematics

The parachute on a race car that weighs 7250 N opens at the end of a quarter-mile run when the car is traveling 45 m/s. What total retarding force must be supplied by the parachute to stop the car in a distance of 1100 m?
_N

2007-11-17 07:13:03 · 1 answers · asked by Anonymous in Physics

It's a question I have for math homework. I have to solve inequalities, but instead of giving the last number, they give clues, and you have to figure out the answer and then substitute it for the number.

ex. 5n-46> the number of stars on the U.S flag in 1945.

I have a few more, but for right now, I only need this one.
PLEASE HELP!
:]

2007-11-17 07:12:28 · 8 answers · asked by Kay 3 in Mathematics

Hey Thanks for reading. I am doing my science fair on carnival games. I am expeimenting to see how carnys use science to make the dart and ballon game,tip a troll game and the ball and bucket toss. All I have is my topic, what should i do next?

2007-11-17 07:09:19 · 1 answers · asked by ron 1 in Physics

Pleas help me solve for x in (x^2)/(0.100 -x)=1.00e-5

2007-11-17 07:08:44 · 2 answers · asked by Paul G 1 in Mathematics

Neglect air resistance.

2007-11-17 07:08:16 · 1 answers · asked by Anonymous in Physics

how is the expression of aconitase protein regulated?
Where can i found out the regulation of gene expression for this protein?

2007-11-17 07:07:48 · 1 answers · asked by simplycurious 2 in Botany

a wrench falls from a helicoper that is rising steadily at +6.0m/s. After 2.0 seconds

a. what is the velocity of the wrench
and how far below the heliocper is the wrench?

2007-11-17 07:07:36 · 2 answers · asked by Rachel P 1 in Physics

Coursework. Thank you very much.

2007-11-17 07:05:45 · 2 answers · asked by Anonymous in Engineering

I tried sketching it and possibly couldnt come up with the ewuation. Need help .... The question is

A rancher wants to fence in an area of 2,400,000 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?

2007-11-17 07:03:30 · 4 answers · asked by Amer 1 in Mathematics

A box is to be constructed so that its heights is 10 inches and its base is X inches by X inches. Suppose that X has a continuous uniform distribution on the interval [8,11].
What is the probability density function of the random variable X?
Express the volume V of the box as a functio of X, and determine the expected volume of the box in cubic inches?

Just help me if you know ANYTHING

2007-11-17 06:58:41 · 1 answers · asked by Lin-z 2 in Mathematics

A circular disk with mass m and radius R is mounted at its center, about which it can rotate freely. The disk has a moment of inertia I = 1/2 m (R squared) . A light cord wrapped around it supports weight mg. Find the total kinetic energy of the system when the weight is moving at a speed v.

2007-11-17 06:56:31 · 2 answers · asked by Anonymous in Physics

Hi All

This year we seem, here in SW Ireland, to have been plagued by loads more flies than usual. Flies of all types, large and small! But a lot of them left patches of black speckles on things (lampshades, windowsills, floor, ceiling, you name it!). I take it this is them sicking up; anyone have any knowledge of this phenomena? Is it some kind of regurgitation? Or is it faeces. It's really tarry, if it dries hard is difficult to get off.

I'd love some proper David Attenborough info on this!

Thanks in advance.

2007-11-17 06:54:05 · 12 answers · asked by Gardenclaire 3 in Zoology

As every schoolgirl/boy knows, fusion within stars results in the formation of helium from hydrogen. Does this mean, then, that evenually the amount of hydrogen in the universe will be insufficient to enable the creation of new stars? Or, are there some processes going on in the universe that result the creation of new hydrogen to replace the hydrogen used up in star fusion?

2007-11-17 06:50:06 · 9 answers · asked by Ptericytol 1 in Astronomy & Space

2007-11-17 06:45:06 · 1 answers · asked by little bird 2 in Chemistry

And how far ago was that?

2007-11-17 06:44:23 · 9 answers · asked by Anonymous in Mathematics

a, drug strength
b. sustitution authorization
c. dosage strength
d. drug name

my answer is b.

2007-11-17 06:41:05 · 6 answers · asked by Anonymous in Medicine

A 15 g bullet traveling horizontally at 865 m/s passes through a tank containing 13.5 kg of water and emerges with a speed of 534 m/s. What is the maximum temperature increase that the water could have as a result of this event?

All that I could think of is using the Quantity of heat equation of course ( Q=mc(change in)T). I have no idea what temperatures to start out with and how to use the velocity. Thanks for any inputs!

2007-11-17 06:37:26 · 3 answers · asked by Neil L 1 in Physics

No, i'm not looking to blow up the world. I have to do a report on it, but i don't have the slightest idea.

2007-11-17 06:35:47 · 4 answers · asked by hope 2 in Engineering

2007-11-17 06:35:39 · 5 answers · asked by Anonymous in Mathematics

removed to cool and freeze the water at 0 degrees C?

2007-11-17 06:34:25 · 2 answers · asked by Anonymous in Physics

My answer: T, assuming f'(c) exists. At the extreme point in f the slope is equal to 0, leaving the slop of the tangent line (f'(c)) = 0.

Correct?

2007-11-17 06:34:03 · 1 answers · asked by John Avry 2 in Mathematics