Science & Mathematics - 28 December 2007

the pain is mostly in upper left chest below the nipple but it often radiates up to collar bones and right shoulder and down to belly button, this is often coupled with extreme light headedness and a sensation that my chest is full of helium, this has been going on for a year now im 20 years old and my ecg came back fine with no abnormal heart rythm, i have an appointment with physician comming up soon, but was curious if anyone had any ideas what might be up, needless to say im a little freaked out

2007-12-28 06:02:08 · 21 answers · asked by Anonymous in Medicine

Tracey has two empty cube-shaped containers with sides of 5 inches and 7 inches. She fills the smaller container completely with water, and then pours all the water from the smaller container into the larger container. How deep, to the nearest tenth of an inch, will the water be in the larger container?

Please tell me how you did it. If possibe, show work.

THANKS! :)

2007-12-28 06:02:07 · 13 answers · asked by Anonymous in Mathematics

When someone asks you where the country of Paraguay is, do you know where it is without looking at a map?

I'm paraguayan and when I tell people where I'm from they have no clue where it is located. Some people think it is a middle eastern country. Where would you say it was located?

2007-12-28 06:01:13 · 9 answers · asked by der Schmetterling 3 in Geography

2007-12-28 06:01:04 · 4 answers · asked by Short Round 1 in Earth Sciences & Geology

The value ∆H = 6.01 kJ mol^-1

The value ∆S = 22.0 J K^-1

2007-12-28 05:59:19 · 4 answers · asked by Jerome D 1 in Chemistry

I NEED TO SOLVE THIS AND FIND THE CENTER AND RADIUS OF THE CIRCLE. Please show me the steps / answer and you'll get best answer :) PLEASE HELP


(x-4)^2 + (y+3)^2 = 16

2007-12-28 05:58:00 · 3 answers · asked by Jaz 'ma' Taz 2 in Mathematics

Does this country have another name now?

2007-12-28 05:57:21 · 5 answers · asked by Good-american 4 in Geography

10. Carbon tetrachloride may be prepared by the reaction of natural gas (methane CH4) and elemental chlorine gas in the presence of ultraviolet light. Write the UNBALANCED chemical equation for this process.

A. CH4 (g) + Cl2 (g) --------> C(Cl)4

11. Calcium oxide reacts with moisture in the air and is converted to calcium hydroxide. Write the UNBALANCED chemical equation for this process.

A. CaO (aq) + H2O (l) --------> CaOH

12. Ammonium nitrate breaks down into nitrogen gas, oxygen gas, and water vapor. Write the UNBALANCED chemical equation for this process.

A. NH4NO3 (aq) --------> N2 (g) +O2 (g) + H2O (g)

2007-12-28 05:52:18 · 2 answers · asked by Anonymous in Chemistry

sorry mi english is really bad

2007-12-28 05:49:28 · 2 answers · asked by Anonymous in Geography

F : x --> x ?

one-to-one function?
bijection?
surjection?

2007-12-28 05:46:39 · 3 answers · asked by UnknownD 6 in Mathematics

Find one ordered pair solution for the equation below, when x=2.

f(x)=2x3+x2-10x-5

Given a zero: x=2, of the polynomial: x3-4x2+21x-34=0, find the others.

2007-12-28 05:46:07 · 5 answers · asked by Anonymous in Mathematics

Why?

2007-12-28 05:43:13 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-28 05:42:53 · 2 answers · asked by Nes Fan 2 in Medicine

Comment on each result and draw a possible structure for each sensible formula:
a) C4H6NO2
b) C5H12O3
c) C4H3N
d) C4H8CI4O2

2007-12-28 05:41:43 · 2 answers · asked by Jerome D 1 in Chemistry

2007-12-28 05:41:30 · 3 answers · asked by Anonymous in Physics

A.radiometric dating.

B.relative dating by presence in a specific stratum of rock.

C.both radiometric dating and relative dating.

D. use of C-14 for the oldest fossils.

E. All of the above are used.

2007-12-28 05:39:52 · 3 answers · asked by Anonymous in Earth Sciences & Geology

A.) A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 16.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration of 4.10 m/s^2 and travels 43 m to the edge of the cliff. The cliff is 37m above the ocean. The acceleration of gravity is 9.81 m/s^2.
How long is the car in the air? Answer in units of s.

B.) What is the car's position relative to the base of the cliff when the car lands in the ocean? Answer in units of m.

2007-12-28 05:39:33 · 1 answers · asked by Melissa 1 in Physics

2007-12-28 05:39:30 · 1 answers · asked by Anonymous in Physics

6. Silver will dissolve in concentrated nitric acid, producing NO gas and leaving a solution of silver nitrate in water. Write the UNBALANCED chemical equation for this process.

A. Ag (s) + HNO3 (aq) --------> NO (g) + AgNO3 (aq)

7. Calcium carbonate reacts by combining with hydrochloric acid, producing a solution of calcium chloride, converting the acid into water, and releasing carbon dioxide gas. Write the UNBALANCED chemical equation for this process.

A. CaCO3 (g) + HCl (aq) --------> CaCl2 (aq) + CO2

8. Hydrogen sulfide burns in air, producing sulfur dioxide gas and water vapor. Write the UNBALANCED chemical equation for this process.

A. H2S (g) --------> SO2 (g) + H2O (g)

9. The group 2 metals (Ba, C, Sr) can be produced in elemental state by the reaction of their oxides with aluminum metal at high temperatures, also producing solid aluminum oxide as a by-product. Write the UNBALANCED equation for the formation of ozone gas from oxygen gas.

A. What?

2007-12-28 05:38:11 · 2 answers · asked by Anonymous in Chemistry

Solve the rational equation below
1. z^2/8 -7z/8 =1

2. 2n^2/2 - 5n/6

2007-12-28 05:37:42 · 4 answers · asked by Anonymous in Mathematics

2007-12-28 05:35:49 · 8 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-28 05:33:05 · 4 answers · asked by Anonymous in Zoology

the ones near your heart

2007-12-28 05:31:00 · 6 answers · asked by grahmcracker 1 in Biology

......then out through the other side of the earth and then you jumped down it, would you fall straight through to the other side of the earth? Would gravity take over in the middle of the earth and you'd be floating?

2007-12-28 05:29:35 · 16 answers · asked by Tracie E 1 in Physics

I saw the pump on the show numbers i forgot what they called it but it started with an H all it had was 3 glass tubes and like glass reservoir's they said that once the water level was just right the air pressure would cause the water to flow up the glass tube and be collected at the bottom and back up again
if you know the name or can find it online fell free to post it

2007-12-28 05:27:06 · 2 answers · asked by Talking Hat 6 in Other - Science

The earth does heat up and cool down naturally

2007-12-28 05:24:30 · 4 answers · asked by elfy1960 2 in Weather

The molar mass of Isotope A is 10.0 g/mol and % abundance is 19.9 %. The molar mass of Isotope B is 11.0 g/mol and % abundance is 80.1 %.

What is the average molar mass of this element?

What element is it?


=0 Help?

2007-12-28 05:24:09 · 2 answers · asked by Anonymous in Chemistry

2007-12-28 05:20:21 · 4 answers · asked by clunny 1 in Earth Sciences & Geology

2007-12-28 05:16:56 · 18 answers · asked by Yahoo Sucks 5 in Other - Alternative

If they are wrong can you tell me the right answer?

1. Balancing an question for a reaction ensures that the number of each type of atom is (blank) on both sides of the equation.

A: equal

2. How do we indicate the physical state of a substance when we write a chemical equation for a reaction?

A: Using either (s), (aq), (l), or (g)

3. In a chenical equation for a reaction, the notation "(aq)" after a substance's formula means that the substance is dissolved in (blank).

A. Liquid water

4. Propane (C3H8) burns in oxygen gas, producing carbon dioxide gas, water vapor, and heat. Write the UNBALANCED chemical equation for this process.

A. C3H8 (g) + O2 (g) --------> CO2 (g) + H2O (g) + heat

5. Pure hydrogen gas is ignited very carefully, the hydrogen burns gently, combining with the oxygen gas of the air to form water vapor. Write the UNBALANCED chemical equation for this reaction.

A. H2 (g) + O2 (g) --------> H2O (g)

2007-12-28 05:15:53 · 4 answers · asked by Anonymous in Chemistry