Science & Mathematics - 11 September 2007

term of rise from 27 silious

2007-09-11 05:35:00 · 3 answers · asked by ziad f 3 in Weather

Find all solutions to these problems

2007-09-11 05:33:24 · 8 answers · asked by Anonymous in Mathematics

An excited ion emits radiation at a wavelength of 654.1 nm in the visible range of the spectrum. Calculate the frequency of a photon of this radiation (in hertz).

2007-09-11 05:30:22 · 1 answers · asked by sean b 1 in Chemistry

I'd like to see what each planet's surface looks like, wouldn't you?

2007-09-11 05:28:45 · 6 answers · asked by Anonymous in Astronomy & Space

i found it in sarra blonca

2007-09-11 05:24:39 · 6 answers · asked by nathankell9 2 in Earth Sciences & Geology

1.has an excess of electrons
2.has a deficiency of electrons
3.has an equal number of protons and neutrons
4.has an equal number of protons and electrons

2007-09-11 05:21:50 · 4 answers · asked by tia 3 in Physics

In Canada and the U.S, a billion has 9 zeros but everywhere else it has 12 zeros. A trillion 12 here and there 18.A decillion 33 here and there 60 zeros.In Europe the word milliard is used and it has 9 zeros.??????

2007-09-11 05:19:09 · 4 answers · asked by Don Verto 7 in Astronomy & Space

force) how can we predict how the universe should have formed with a poor understanding of GUT, unified field theory or a string theory?

2007-09-11 05:18:48 · 2 answers · asked by Anonymous in Physics

Would you go find Will Smith?

2007-09-11 05:18:08 · 14 answers · asked by Bill W 【ツ】 6 in Astronomy & Space

2007-09-11 05:15:59 · 8 answers · asked by Joey 2 in Weather

Right now i am in the Marine Corps. I have 2.5 years left before my first contract is done. I didnt join till i was 22 because i did some college and worked. I did good in all my classes want finished with a 3.8 but it was Paralegal. Now i am a Marine Air Traffic Controller and im pretty good at it. I just dont want to stay in doing it or get out and do ATC. I want to check out EE but dont know how hard it is or if it makes okay money. Can anyone let me know some details, am i smart enough to make it through the college, does it support a family well?

2007-09-11 05:13:31 · 7 answers · asked by D T 1 in Engineering

First of all I will type the question and then explain what my problem is.

A 41 m guy wire is attached to the top of a 34.6 m antenna and to a point on the ground. How far is the point on the ground from the base of the antenna, and what angle does the guy wire make with the ground?

I found that the point from the ground to the base of the antenna is 22 m, which according to my book is correct. Now, I know there is a 90 degree angle in there, but I'm confused as to how to find the other angles since no other angles were given. Can someone please explain to me how to do this?

2007-09-11 05:12:45 · 5 answers · asked by Nicky 2 in Mathematics

Consider a solution separated from pure water by a semipermeable membrane that permits the passage of water,
but not solutes. Which statement is false?

a) Osmotic pressure depends upon the size of the solute molecules.

b)Osmosis is the movement of solvent from a region of high solvent concentration to a solution of lower solvent concentration.

c)Osmotic pressure is the pressure that must be applied to the solution to prevent the inflow of water.

d)Osmotic pressure could be eliminated if enough solute were added to the region of pure water.

explanation please thanx

2007-09-11 05:11:54 · 4 answers · asked by Anonymous in Chemistry

If an airplane were to hover over Greenwich, and continued hovering in space, would it actually have had covered some distance, if it came down after five hours?
Theoretically, it should almost have the same result as an airplane that is covering distance by flying over earth.
how much would inertia affect the outcome?why would it not cover distance if it hovered long enough? would gravity actually pull the hovering plane along with it?

2007-09-11 05:11:24 · 2 answers · asked by Sooban 1 in Physics

i have a hard time to understand stable molecule or not
Carbon :some time carbon have 0 formal charge, +1 formal charge, - 1 formal charge ( not stable)

can you explain it to me, and how do you know when they are stable or not by looking at molecule.
thank for all participates.

2007-09-11 05:10:36 · 2 answers · asked by phong pham 2 in Chemistry

In this:
http://img237.imageshack.us/my.php?image=49711639db7.jpg
angle BCD=140degrees
AB=AC=AD=8
calculate BD

Please show me the way.
Please don't use Cosine Law because this question is in the part of the book that is a lot before the cosine law and there should be a solution without it.

2007-09-11 05:06:37 · 2 answers · asked by Anonymous in Mathematics

The combined total mass in grams of a beaker and pure water is 95.175g

1. Find the Volume of water in liters(hint: water has a density of 1g/mL)

2. What is the density (g/mL) of a solid with a mass of 4.75g and a volume of 6.2mL?

3. Find the mass (g) of a sample if 257mL of it has a specific gravity of 1.75?

4. Design an experiment to determine the density of lead and that of aluminum. Predict which one of the two metals has a higher density and explain your answers. (Hint: read this experiment carefully before you answer)

2007-09-11 05:03:59 · 5 answers · asked by Gumby 1 in Chemistry

2007-09-11 05:02:58 · 14 answers · asked by toria_coombes 1 in Astronomy & Space

If so what would the offspring look like? Would it look different depending on which species was the father?
Are there photos of such crosses?

2007-09-11 05:02:57 · 13 answers · asked by Anonymous in Zoology

2007-09-11 05:00:50 · 3 answers · asked by Anonymous in Astronomy & Space

i just moved to missoula from boston, and i know it's dry here but does it get a fair snow fall?

2007-09-11 05:00:15 · 3 answers · asked by sandy c 2 in Weather

please help me!!

2007-09-11 04:58:33 · 5 answers · asked by ? 1 in Biology

2007-09-11 04:58:02 · 4 answers · asked by Anonymous in Astronomy & Space

I'm doing an experiment in chemistry that involvesmath and measurements, and we're supposed to find Delta T using all these measurements and I'm not good at it at all. so if someone coujld please help me, that would be awesome!

here are the experiment details:

we have the mass of metal: 28.4g
mass of a calorimeter: 10.5g
mass of calorimeter with water in it: 466.5g
mass of calorimeter with water minus the mass of calorimeter: 456g

the temp. of water after 3 min: 25 degrees celcius.
what we had to do is drop a peace of lead that was in boiling water into room tem. water and watch how the temperature changed, but the temp did not change.
anyways....
the final temperature is: 25 degrees celsius
after this we have to determine how much heat the metal transferred to the water but there was no heat transferred so we just used 26 degrees celsius instead. so after that we need to use this eqaution: q= m times c times delta t, but i'm stuck from there. its long, but i'm stuck!

2007-09-11 04:57:03 · 8 answers · asked by singingfrog_92 2 in Chemistry

A field goal is attempted when the football is at the center of the field, 40 yd from the goalposts. if the kicker gives the ball a celocity of 40ft/s toward the goalpost at an angle of 45 degrees to the horizontal, with the kick be good? the crossbar if 10 ft above ground and must clear this height.

2007-09-11 04:52:30 · 1 answers · asked by port 1 in Physics

I put a drop of NaOH into a beaker that had a buffer with a pH of 7 in it, and the pH rose by 0.01 and then i put 3 moe drops of NaOH and the pH rose by 0.01. How does the buffer control the pH.

Then I put a drop of HCl into another beaker with a buffer with a pH of 7 in it, and the pH rose by 0.05 and then i put 3 more drops of HCl into the same beaker and the pH lowered by 0.03. Then I put 6 more drops of HCl into the same beaker and the pH lowered by 0.01. why did the pH rise then lower, and how does the buffer control it.

2007-09-11 04:50:48 · 2 answers · asked by robert johnson 2 in Chemistry

2007-09-11 04:48:23 · 10 answers · asked by Boogie 2 in Mathematics

recipe
subscript
formula

2007-09-11 04:44:18 · 3 answers · asked by tia 3 in Chemistry

In a gamma decay process, the internal energy of a nucleus of mass M decreases, a gamma photon of energy E and linear momentum E/c is emitted and the nucleus recoils. Find the decreases in internal energy.

2007-09-11 04:43:06 · 1 answers · asked by rock_bottom456 2 in Physics

What integers are on each side of the two cards?

Explain how you worked out your answer.

Sorry I am trying to help my daughter with this but I have brain drain.

Can anybody please help.

Thank you.

2007-09-11 04:39:38 · 5 answers · asked by cat1967 2 in Mathematics