Science & Mathematics - 4 December 2007

2x^+ 8x + 3 = O
This is how far I got: x^2 + 8x + 3/2 = 0
x^2 + 8x = -3/2
but not sure how to proceed from here. the book is really confusing.

2007-12-04 18:23:05 · 9 answers · asked by lcollis2002 1 in Mathematics

Can't US government or CIA use Hubble telescope as a spy satellite to view high resolution images on earth?

2007-12-04 18:17:55 · 7 answers · asked by EraTH 1 in Astronomy & Space

2007-12-04 18:15:35 · 6 answers · asked by Savannah J 2 in Mathematics

2007-12-04 18:11:43 · 4 answers · asked by Anonymous in Astronomy & Space

A gas is compressed at a constant pressure of 0.800 atm from 8.00 L to 1.00 L. In the process, 360 J of energy leaves the gas by heat.
(a) What is the work done on the gas?
__J
(b) What is the change in its internal energy?
__J

2007-12-04 18:08:10 · 2 answers · asked by Anonymous in Physics

A sample of Freon-12 (CF2Cl2) occupies 25.5 L at 247.3 K and 127.6 kPa. Find its volume at STP.

10 pts for best answer

2007-12-04 18:03:06 · 2 answers · asked by Anonymous in Chemistry

2007-12-04 17:59:52 · 5 answers · asked by Savannah J 2 in Mathematics

A weather balloon is filled with 11 L of helium on the ground wher the atomospheric pressure is 0.9 atm on that day.. If the balloon rises to a height of the atmosphere where the pressure is 0.3 atm, what will the new volume of the balloon be?

2007-12-04 17:57:48 · 3 answers · asked by Anonymous in Chemistry

find the length of a diagonal from a corner on the floor to the opposite corner on the ceiling

2007-12-04 17:56:11 · 5 answers · asked by Savannah J 2 in Mathematics

How many pieces of square floor tile, 1 ft on each side, would you need to buy to tile a floor that is 11'6'' by 8'?

2007-12-04 17:54:56 · 2 answers · asked by Savannah J 2 in Mathematics

the answer is given 1.25 M but how do I get that?
thanks, studying for a Thursday test.

2007-12-04 17:54:01 · 2 answers · asked by Boo Radley 4 in Chemistry

http://www.whatthebleep.com/crystals/

Apparently thoughts can directly affect our environment, but how can they without physical contact, without being detectable?

2007-12-04 17:51:50 · 6 answers · asked by Be My Angel :] 4 in Physics

Can mechanical energy ever be transformed completely into heat or internal energy? Can the reverse happen? In each case, if your answer is no explain why not: if yes give an example.

2007-12-04 17:49:09 · 1 answers · asked by ~♥ LilPink ♥~ 2 in Physics

A 500g hockey puck experiences an applied horizontal force of 50N [W] as it slides across the ice with an acceleration of 2.3 m/s2 [W] against the force of friction. Determine the magnitude and direction of the frictional force acting on the hockey puck.

2007-12-04 17:44:33 · 1 answers · asked by myname_isalbert 1 in Physics

I know its bit of a silly question but I have this Pharmacy prep class in high school and it was a question on a test, if anybody has a clue why, please help

2007-12-04 17:44:25 · 8 answers · asked by Dat Chick 1 in Medicine

2007-12-04 17:34:21 · 13 answers · asked by XXXiLLUmiNaTiXXX 1 in Geography

2007-12-04 17:34:06 · 7 answers · asked by jan28 1 in Astronomy & Space

2007-12-04 17:31:07 · 1 answers · asked by chisoxfan1998 1 in Biology

2007-12-04 17:30:38 · 2 answers · asked by chisoxfan1998 1 in Medicine

2007-12-04 17:29:58 · 2 answers · asked by chisoxfan1998 1 in Biology

Given that every proton-proton chain from hydrogen to helium produces gamma rays; so I have read.

2007-12-04 17:27:16 · 5 answers · asked by Ultraviolet Oasis 7 in Astronomy & Space

how do i show without graphic?

2007-12-04 17:26:48 · 3 answers · asked by Anonymous in Mathematics

An investor has $59,000 to invest in three types of bonds. They are short term, intermediate term, and long term. How much should she invest in each type to satisfy the given conditions? Short term bonds pay 4% annually, intermediate term bonds pay 6%, and long term bonds pay 8%. The investor wishes to have a total annual return of $3,800 on her investment, with equal amounts invested in intermediate term and long term bonds.

2007-12-04 17:25:52 · 2 answers · asked by Rachel 1 in Mathematics

a) write down the system in the matrix from AX=B
b) obtain the determinant and inverse of A
c) compute the matrices: A^2,A^3,(A^-1)^2,(A^-1)^3 and thier determinants.
d)solve the system

Please help.

2007-12-04 17:23:36 · 2 answers · asked by tony2007 2 in Mathematics

I know why, I just want to here what everyone else thinks.

2007-12-04 17:21:24 · 18 answers · asked by Jaws 2 in Zoology

6. Two spacecraft in outer space attract each other with a force of 20 N. What would the attractive force be if they were one-half as apart?



8. The gravitational force between two very large metal spheres in outer space is 50 N. How large would this force be if the mass of each sphere were cut in half?




10. How does the Earth’s gravitational force on you differ when you are standing on Earth and when you are riding in a space shuttle 400 km above Earth’s surface? Earth’s radius is 6400 km.




16. The acceleration due to gravity on Titan, Saturn’s largest moon, is about 1.4 m/s/s. What would a 50-kg scientific instrument weigh on Titan?



22. By what factor is Earth’s gravitational field reduced at a distance of 5 Earth radii from the center of the Earth?

2007-12-04 17:19:31 · 1 answers · asked by Danielle P 1 in Physics

How many pieces of square floor tile, 1 ft on each side, would you need to buy to tile a floor that is 11'6'' by 8'?

2007-12-04 17:18:05 · 3 answers · asked by michelle r 1 in Mathematics

Acid rain can form from the combustion of nitrogen gas producing HNO3(aq) in a two-step process.
N2(g) + 2O2(g) → 2NO2(g)
3NO2(g) + H2O(g) → 2HNO3(aq) + NO(g)

a. A car burns 420. g of N2 according to the above equations. Howmany grams of HNO3 will be produced?

b. For the above reactions to occur, O2 must be in excess in the first step. What is the minimum amount of O2 needed in grams?

c. What volume does the amount of O2 in part b occupy if its density
is 1.4 g/L?


I don't get it. If you can help, thanks a ton !
much help appreciated ! :D

2007-12-04 17:17:01 · 1 answers · asked by ♥ ♥ ♥ 3 in Chemistry

Any help would be greatly appreciated.
1. Write the pH of the following solutions:
a. [HNO3=1.0 x 10 -3M
b. [H3O+]=2.5 x 10 -4M
c. 1.0 x 10 -2M KOH
d. [OH-]=0.00037M

2. Hydrocyanic acid, HCN, reacts with water to form a solution containing CN- and hydronium ion. Write the chemical equation to show the reaction of hydrocyanic acid with water. List the formula of the conjugate base of HCN; List the chemical formula of each acid in the equation. Then write the Ka expression for this reaction.

3. The value of the acid ionization constant, Ka, for HCN is 4.4 x 10 -10. What is the concentration of H3O+ in a 1.65M solution of hydrocyanic acid? Show set-up.

4. What is the pH of the 1.65M HCN solution?
Thanks in advance!!

2007-12-04 17:16:45 · 1 answers · asked by ortegaphoto 1 in Chemistry

i m single

2007-12-04 17:13:03 · 2 answers · asked by Anonymous in Medicine