Science & Mathematics - 11 December 2006

i need help...

2006-12-11 11:45:02 · 2 answers · asked by Risa 1 in Mathematics

2006-12-11 11:43:58 · 7 answers · asked by Rob P 1 in Biology

I suck at chemistry...what are the names of these?(This isn'tmy homework) maybe you can tell me how you make the names...?
SiCl4 PCl3 NO3 - SF6 PCl5 IF3 XeF5 + SO4 2-

2006-12-11 11:43:06 · 3 answers · asked by Jake 1 in Chemistry

I want to know ist like hydrogen something.

2006-12-11 11:42:19 · 6 answers · asked by italinfroboy 2 in Biology

Thousands of birds come the same time everyday, stay about half hour and fly on. Does anyone know why? Thanks

2006-12-11 11:42:07 · 4 answers · asked by mamaray4u 1 in Zoology

Can some one tell me some info on the mad cow disese please?

2006-12-11 11:42:02 · 3 answers · asked by ~*Jess*~ 2 in Zoology

Please Help:

93.0 ml of 0.150 M magnesium hydroxide is added to 57.0 ml of 0.4 nitric acid. Magnesium nitrate and water are formed. What is the concentration of the magnesium nitrate after the reaction.

Ok know that the answer is 0.152M I just don't knwo how my teacher got it.

2006-12-11 11:40:55 · 1 answers · asked by slickestboy2 1 in Chemistry

Use absolute value notation to describe the given statement?

1 The distance between x and 7 is at least 4.
2 The distance between x and 25 is no more than 10
3 The distance between y and -30 is less than 5
4 The distance between y and ½ is more than 2

2006-12-11 11:39:33 · 5 answers · asked by Hamza 1 in Mathematics

i would like to get some answers please i have a science project due tomorrow!
HELP ME lol

2006-12-11 11:38:56 · 3 answers · asked by beecckkyyy 2 in Zoology

Please Help:

What volume of 0.27 M Sodium hydroxide is needed to reactc with 29.5 ml of 0.55 M phosphoric acid.

Ok I know the answer is 180ml I just dont know how my teacher got that.

2006-12-11 11:38:44 · 1 answers · asked by slickestboy2 1 in Chemistry

Help. I follow this problem except for one very big problem. How is it that .01490 turns into 0.149?

200.0 J of heat is required to raise the temperature of an object by 3.00 C. If the specific heat of the object is .01490 J/gC... what is the mass of the sample?

I understand that I have to solve for mass and therefore isolate it.
Therefore:
200.0 = ____ x .01490 x 3.00C
200 = M(0.149)(3)
From there, I understand that 200 = 0.447

But I do NOT understand how .01490 becomes 0.149.

2006-12-11 11:38:19 · 2 answers · asked by ♥ Mommy To Be 12/20/09 ♥ 3 in Chemistry

Same about Geography

2006-12-11 11:38:10 · 5 answers · asked by haley 1 in Geography

A 100 kg basketball player can leap straight up in the air to a height of 80 cm. You can understand how by analyzing the situation as follows: The player starts solid on the ground, with his knees bend ready to jump. THe instant he leaves the ground his head has moved vertically 60 cm, but remember his knees were bent to begin with. The max height from his feet to the ground is 80 cm
With what speed must the player leave the ground to reach a height of 80 cm?
m/s

What was his acceleration, assumed to be constant, as he jumped?

2006-12-11 11:36:33 · 3 answers · asked by MattS 1 in Physics

Four 9.0 kg spheres are located at the corners of a square of side 0.64 m. Calculate the magnitude and direction of the total gravitational force exerted on one sphere by the other three.

2006-12-11 11:36:01 · 1 answers · asked by Anonymous in Physics

I need 2-3 for each one.Thank you for your help.

-~♥~Sania~♥~

2006-12-11 11:34:36 · 4 answers · asked by ~♥~ 1 in Zoology

a map not colored please

2006-12-11 11:34:32 · 3 answers · asked by Veronica C 1 in Geography

2006-12-11 11:32:40 · 5 answers · asked by sue m 2 in Mathematics

Say that a deciduous tree's leaves fall each year, and they are not allowed to decompose and reenter the soil. Why doesn't the tree deplete its soil of nutrients? Does the tree resorb nutrients from the leaves before they fall off? I would imagine that all that chlorophyll requires a whole lot of magnesium from the soil each year, so why doesn't the tree run out of it?

2006-12-11 11:32:30 · 6 answers · asked by adsfasdfasf 2 in Botany

2006-12-11 11:28:35 · 7 answers · asked by James C 1 in Astronomy & Space

i need to convert from feet per second to miles per hour, 5 feet per second. thank you

2006-12-11 11:28:20 · 3 answers · asked by bckeys44 2 in Mathematics

The asteroid Ceres has a mass of 7.0 * 10^20 kg and a radius of 500 km.

a. What is the gravity on the surface of Ceres?

b. How much would a 90-kg astronaut weigh on Ceres?

Please help me with this problem.
I'm having trouble understanding it.

2006-12-11 11:27:57 · 2 answers · asked by vicky p 1 in Physics

Somebody told me they were dyed. I don't believe her. I think it is naturally occurring coloration of the rock.

2006-12-11 11:24:48 · 2 answers · asked by John L 5 in Earth Sciences & Geology

2006-12-11 11:23:44 · 6 answers · asked by Shadow 1 in Astronomy & Space

How long does it take from when the shuttle leave the ground to when it reaches orbit. Also, How long from the ground to reach the ISS?

2006-12-11 11:23:36 · 1 answers · asked by Paul M 2 in Astronomy & Space

Editon Longwell invested $33,600, part at 5% interest and the remainder at 8% interest. If he earned twice at much from his 5% investment at his 8% investment, how much did he invest at each rate?

2006-12-11 11:23:17 · 2 answers · asked by Anonymous in Mathematics

2006-12-11 11:21:56 · 6 answers · asked by Anonymous in Mathematics

2006-12-11 11:21:00 · 9 answers · asked by sue m 2 in Mathematics

I need this information for a graduation project. If you have any websites, articles, or books that could be helpful I would be more than grateful. Thanks!

2006-12-11 11:20:33 · 3 answers · asked by sarah l 1 in Physics

How would I go about solving

Evaluate double integral of (F dS) if F=(4xy)i(–6x^2)j+(4yz)k and the surface S is given by z=xsin(3y) for 0 double integral of (F dS)=

I started out geting P,Q,R
P = 4*x*y
Q = -6*x^2
R = 4*y*z = 4*y*x*sin(3y)

Now I wanted to use the forumula
double integral of (F dS) equal Double integral over D of (-P dg/dx -Q dg/dy + R) dA
(note: d = partial)

but I can't figure what dg/dx and dg/dy mainly because I don't know what g would be.

2006-12-11 11:19:15 · 2 answers · asked by need4 1 in Mathematics

2006-12-11 11:19:14 · 5 answers · asked by Anonymous in Zoology