Science & Mathematics - 2 November 2007

Titanium (work function= 6.94*(10^-19) Joules) and Silicon (work function=7.77*(10^-19) Joules) surfaces are irradiated with UV radiation with a wavelength of 241 nanometers.

What is the wavelength of the electrons emitted by the Titanium surface?

2007-11-02 08:53:23 · 2 answers · asked by majoraganondorf 1 in Physics

A)sulfur dioxide
B)carbon dioxide
C)ash

2007-11-02 08:52:24 · 11 answers · asked by Anonymous in Earth Sciences & Geology

Carbon Dioxide is a mix of 1 carbon and 2 oxygen. Where does the carbon come from?

2007-11-02 08:51:59 · 10 answers · asked by Ethan F 1 in Biology

There is a 3.7 mass on a frictionless inclined surface and is connected to a 2kg mass. The pulley has no mass or friction. The 2kg mass is acted upon by an upward force of 3.9N, and a downward acceleration of 4.6m/s^2. I found the tension in the connecting string and it was 6.5N what I don't get is how to find the angle please help me with this someone else tried and they did 4.6=gsin, but that was wrong and I don't think the other person is going to answer. Please help me.

2007-11-02 08:51:03 · 1 answers · asked by tanya 1 in Engineering

Phosphoric acid is produced through the reaction between tetraphosphorous decoxide (P4O10) and water.

2007-11-02 08:50:30 · 5 answers · asked by Caramel 2 in Chemistry

I'm having troubles trying to figure out where these places are..could someone help me?

52(degrees)27'N 13(degrees)18'E
45(degrees)27'N 9(degrees)17'E
48(degrees)53'N 2(degrees)20'E

2007-11-02 08:50:16 · 4 answers · asked by Verity 2 in Mathematics

In Example 8-10, mass m1 = 2.40 kg is connected to mass m2 = 1.80 kg as shown. Suppose the two masses start from rest and are moving with a speed of 2.10 m/s just before m2 hits the floor.

http://i214.photobucket.com/albums/cc30/bkoz319/08-10ex.gif

(a) How much conservative work was done on this system?

(b) How much nonconservative work was done on this system?




Thanks sooooo much for your time!!!!

2007-11-02 08:48:46 · 5 answers · asked by SurferGirl9 1 in Physics

2007-11-02 08:48:09 · 1 answers · asked by Marina C 1 in Zoology

would we be re-assembled with our soul ?

2007-11-02 08:47:54 · 12 answers · asked by Zipperhead 6 in Physics

If anyone knows any cool tips and tricks please reply. I been explained it, I just want to know if any of you know any shortcuts along the way. I know theres a lot of methods. Thanks.

2007-11-02 08:45:56 · 6 answers · asked by grfisgd 6 in Mathematics

1) What is the wavelength of a 100 M-Hz(100FM) radio signal?
2)What would be the frequency of an electromagnetic wave with a wavelength of 12800?
3)Estimate the frequency of an electromagnetic wave having a wavelength equal to the size of the period at the end of this sentence. In what part of the electromagnetic spectrum would such a wave lie?
4) What would be the wavelength of an electromagnetic wave having a frequency equal to the clock speed of a 3.2GHz personal computer? In what part of the electomagnetic spectrum would the wave lie?
Thanks!

2007-11-02 08:41:56 · 4 answers · asked by Anonymous in Astronomy & Space

2007-11-02 08:40:19 · 6 answers · asked by viinardo92 1 in Zoology

Can someone please advise me the correct final unit of measurement should be in the following simple calculation?

Velocity = volume per unit time/cross sectional area.

Volume per unit time = 10.08 litres per minute = 10080 millilitres per minute. 10080/60 = 168 millilitres per second.

Cross sectional area = pi radius sqared. (pi is rounded to 3 for simplicity) = 3 x 1cm sqaured = 3 cm sqared.

Velocity therefore = 168 millilitres per second (or cubic cm per second)/3 cm squared = 56..... but 56 what? 56 cm per second?

2007-11-02 08:38:14 · 4 answers · asked by natrub 2 in Mathematics

2007-11-02 08:34:26 · 1 answers · asked by Anonymous in Engineering

I don't know.

2007-11-02 08:32:35 · 7 answers · asked by Anonymous in Zoology

What volume (to the nearest 0.1 mL) of 4.30-M HCl must be added to 0.350 L of 0.200-M K2HPO4 to prepare a pH = 7.80 buffer?

I keep getting 13mL by making a rxn table and finding x. Then converting from L-Ml I am doing something wrong.

PH=Pka+log(b/a)
H3O+HPO4<->H30+H2PO4
x........(.07)........n/a........0
-x........-x............n/a........+x
0........(.07-x).....----........x

I found x to be .0557mols

.0557mols=4.30M * (#L)
(#L)=.01295L *1000mL=12.95mL

What am I doing wrong?

2007-11-02 08:32:25 · 1 answers · asked by Anonymous in Chemistry

2007-11-02 08:31:34 · 2 answers · asked by Anonymous in Weather

2007-11-02 08:31:25 · 17 answers · asked by Anonymous in Astronomy & Space

Me again

Fact: Bugs have a body diameter of only 2cm as they breather through spiracles and not lungs. The ratio of respiration with a concentration of oxygen at 21% (todays enviroment) prevents them from getting bigger as it would be extremely difficult to load oxygen over a lobnger distance to respirinig tissue.

This prevents bugs getting any bigger than 2cm in diamtere

Execptions to this are things like Stag or Rhino beatles, but their large body index is due to their exoskelteon casing, which is made up of chitin and is non respiring.

Back in the days..lets use evo years for arguments sake
bugs were gigantic, Everyones favourite paleontologist ross Geller from Friends has a fossil of A dragon fly with a wingspan over 30 inches on his wall i am sure you have all seen it.

Ok here's the second fact

A dragon fly may rise to an enormopus size and have a wing span over 20 inches becuase it's able to load its body with enoguh oxygen

2007-11-02 08:27:32 · 1 answers · asked by Anonymous in Zoology

2007-11-02 08:20:48 · 3 answers · asked by Anonymous in Physics

Do you believe it??

2007-11-02 08:20:39 · 7 answers · asked by Deenie 6 in Paranormal Phenomena

anybody else think that its so pathetic how scientists research and spend money on such useless research.
why in the world would we need super mice for f. sakes..
what happaned to the third world countries.

http://uk.news.yahoo.com/skynews/20071102/twl-mighty-mouse-key-to-a-human-breakthr-3fd0ae9.html

2007-11-02 08:19:49 · 7 answers · asked by ? 2 in Zoology

If you call 911 and EMS has to take you to the hospital, how much is the bill that you get in the mail later on for ambulance services? If you were taken in for alcohol poisoning.

2007-11-02 08:19:05 · 20 answers · asked by babygirl 1 in Medicine

Why?

2007-11-02 08:18:02 · 4 answers · asked by Marina C 1 in Zoology

2007-11-02 08:12:50 · 5 answers · asked by yogi 5 1 in Geography

2007-11-02 08:12:48 · 5 answers · asked by Anonymous in Physics

As winter approached the men decided that they must burn fire in the fireplace to stay warm.

First man went into the forest and brought back 3 sacks od firewood.
Second man brought back 4 sacks od firewood.
third man brought back 5 sacks od firewood.

The fourth man said:
'We've got enough firewood already, do not we? Instead of bringng more firewood let me pay the three of you total $24 for your efforts',
and everyone agreed.

How should the three men divide $24?

2007-11-02 08:12:28 · 6 answers · asked by Alexander 6 in Mathematics

Rank the following 0.10 M solutions in order of increasing pH (lowest pH to highest pH):

HOCl HNO3 HF NaCl

Rank the following 0.10 M solutions in order of increasing pH:

HC2H3O2 NaCl NH3 HCl KOH

2007-11-02 08:11:57 · 3 answers · asked by Guinness 3 in Chemistry

I heard that when I was little but never knew if it was true.

2007-11-02 08:09:08 · 22 answers · asked by MJ 1 in Biology

2007-11-02 08:06:16 · 2 answers · asked by Anonymous in Medicine