Science & Mathematics - 30 January 2007

2007-01-30 12:33:45 · 7 answers · asked by jkdtieuytihjkluotr 1 in Chemistry

"K2(CO3)+2HCl=2KCl+CO2+H2O"
Is this balanced equation of a chemical reaction between potassium carbonate and hydrochliric acid is right??

2007-01-30 12:32:46 · 2 answers · asked by Anonymous in Chemistry

When you're balancing an equation, how do you know whether or not to add a plus sign or what to do? For example, when you balance say
5O(2)+C(3)H(8) (Parantheses mean subscript)
you get 3CO(2)+4H20

My question is how did it end up to being PLUS 4H20?
Any explanation will be greatly appreciated.

Chemistry is so confusing, if anyone has simpler steps or shortcuts to arriving to an answer, please let me know. Thank you.

2007-01-30 12:31:51 · 6 answers · asked by Lahmsdagr8est! 2 in Chemistry

hurryyy

2007-01-30 12:31:08 · 6 answers · asked by DMcCormack 1 in Chemistry

has anyone noticed this..that when you are swimming underwater and look at someones hair, it's all fluffy and light like a shampoo commercial. why is this?

2007-01-30 12:29:54 · 6 answers · asked by deejay 3 in Other - Science

ASAP

A physics tutor no more than $20 an hour.

2007-01-30 12:28:40 · 2 answers · asked by Mutual Help 4 in Mathematics

I think this is the answer 1 and 1 over 3
I'm not sure.

2007-01-30 12:27:31 · 24 answers · asked by Anonymous in Mathematics

12. A body with a mass of 7 kg is accelerated at a rate of 24 m/s^2. What force is required?

13. Aforce of 565 N is needed to produce an accleration of 22 m/s^2. What is the mass of the acceleration body?

14.What is the rate of acceleration when 75 N of force are applied to an object with a mass of 15 kg?

15. Mom's old Cadillac (a 1974) has a mass of 1500 kg. What is the weight of the old heap?

16. An astronaut's weight on the moon is only 75 N and his mass was calculated to be 45.92 kg. What is the rate of acceleration due to gravity on the moon?

17. The Kentucky Derby winner has a mass of 556 kg. What is the weight of the animal?

18. Baby Huey has been in the refrigerator and pantry again! He is now up to 888 N. What is the mass of the bouncing baby boy?


PLEASE SHOW WORK AND FORMULA
THANK YOU

2007-01-30 12:27:24 · 4 answers · asked by J 6 in Physics

Help with these factoring problems:

1. x^2 + 6x + 9y^2

2. x^3 - 25x

3. 18m^2 - 8y^2

4. 2a^5 - 162a

2007-01-30 12:27:10 · 7 answers · asked by Mia16 3 in Mathematics

2007-01-30 12:25:11 · 6 answers · asked by astronomy 101 1 in Astronomy & Space

2007-01-30 12:25:02 · 6 answers · asked by Anonymous in Zoology

f(x) = x^2, x= 1

formula in use lim f(x+h)-f(x) / h
h-->0

2007-01-30 12:22:11 · 1 answers · asked by Anonymous in Mathematics

don't give any stupid or ignorant answers thanks!

2007-01-30 12:21:09 · 2 answers · asked by miamigreenkitty 2 in Biology

Please put these in order from the bottom up
Earths Surface
Thermosphere
Mesosphere
troposphere
Stratosphere
Stratopause
Mesopause
Ionosphere
Tropopause
Exosphere
Thank you to anyone who answers please answer only if you ARE SURE This is very Important, thanks.

2007-01-30 12:20:41 · 7 answers · asked by Anonymous in Astronomy & Space

2007-01-30 12:19:15 · 5 answers · asked by LadyRebecca 6 in Earth Sciences & Geology

I still don't understand how to simplify radicals. In the example √36x^2y^12, it equals 6√x^2y^12, which equals 6xy^6. I understand the 6 and the x, but I don't understna how you get y^6.
When you find the square roots of variables to powers, don't you divide the even numbered power by two to take the variable out of the radical?
And how do you do odd powered powers? For example, when you have √8x^3, don't you get 2√2x^2x, which equals 2x√2x ?

2007-01-30 12:15:24 · 5 answers · asked by ♥♥♥ 2 in Mathematics

which fraction is equialent to 3 2/3 ... 24/7...143/39...121/33...45/14...110/30...66/18...95/26...36/12
you can pick more than one

2007-01-30 12:14:12 · 4 answers · asked by Anonymous in Mathematics

Hi, can someone explain to me why there is an increase in urine output with patient that is diabetes mellitus? thank You.

2007-01-30 12:13:11 · 8 answers · asked by Anonymous in Medicine

Do you know what 3/4 + 5/6 is anyone can show me i would appreciate it?

2007-01-30 12:13:09 · 11 answers · asked by Christal R S 1 in Mathematics

I know that Cathode rays exist in the form of streams of high speed electrons emitted from the heating of a cathode inside a vacuum tube, at its rear end.The emitted electrons form a beam within the tube due to the voltage difference applied across the two electrodes (the CRT screen typically forms the anode). The beam is then perturbed (deflected), either by a magnetic or an electric field, to trace over ('scan') the inside surface of the screen (anode). The screen is covered with a phosphorescent coating (often transition metals or rare earth elements), which emits visible light when excited by the electrons.Which means you need a curved surface to make the image appear undistorted so how do they do it with a flat surface?

Thanks ahead of time!

2007-01-30 12:12:35 · 1 answers · asked by Anonymous in Physics

2007-01-30 12:11:54 · 6 answers · asked by to protect and serve 2 in Weather

I don't get this promblem some1 help!

2007-01-30 12:11:51 · 8 answers · asked by Anonymous in Mathematics

2007-01-30 12:10:57 · 6 answers · asked by to protect and serve 2 in Weather

What is this technology called and how does it work?

2007-01-30 12:10:29 · 5 answers · asked by Goodtimes 2 in Astronomy & Space

i dunno where to start with this question, because i don't really know what it means

Let G be a group. The centre Z(G) of G is defined by

Z(G)={g in G : gx=xg for all x in G}

show that Z(G) is a normal subgroup of G.

Then, let Z=Z(GL(2, reals)), i.e. the set of all 2x2 matricies with real entries and non-zero determinant, that is, Z is the centre of GL(n, reals) and show that Z= the matrix

a 0
0 a

such that a belongs to the set of the reals star, which means all the real numbers except zero.

Any help would be greatly appreciated.

2007-01-30 12:10:17 · 3 answers · asked by drummanmatthew 2 in Mathematics

2007-01-30 12:10:15 · 5 answers · asked by Pinkie 1 in Chemistry

A ten meter pole casts a 17 meter shadow directly down a slope when the angle of the sun is 42 degrees. Find the angle of the elevation of the ground.


This one needs to be drawn out. But, I am so confused. I know that you need to make a right triangle. That means that the right angle is below ground. The 42 degrees is then the angle from underground to the top of the telephone pole. I need to know the angle from the underground portion of the corner to the bottom of the pole. Help please.

2007-01-30 12:09:03 · 3 answers · asked by snipps 4 in Mathematics

i have a 30hp induction motor which powers a screw type extrusion with heavy load. my guess is the pressure inside the cylinder can reach up to or more than 1,500 psi which can cause over or under pressure. in effect, over pressure causes over coating, over heating, wear & tear to the cylinder and screw. (screw @ constant 30rpm, thats why it tends to over pressure. because it just keeps going and continue to build up pressure) under pressure causes undercoating. my intentions are to control the pressure inside by replacing induction motor to a hydraulic motor, my guess is that it would control the pressure inside by self adjusting the screw rpm, if i set a certain pressure to the hydraulic pump, will it maintain the set pressure inside the cylinder?? or self adjust the rotation speed?? like if the cylinder is overpressure it will slowdown to maintain the set pressure and if its under pressure it will compensate and attain the set pressure by rotating the screw faster??

2007-01-30 12:03:17 · 2 answers · asked by well_behaved_guy 1 in Engineering

If you are breathing a gas mixture that is 79% nitrogen and 21% oxygen, are there risks to your general health?

2007-01-30 12:03:15 · 3 answers · asked by Anonymous in Medicine

E.G. is there another world in this world but traped in another dimention.is there like a string of worldswhere we all exsist but do thing just a tiny bit different whitch results in different fates for us in all these different worlds.sorry if i totally confused evey one

2007-01-30 12:01:41 · 20 answers · asked by Heather H 2 in Astronomy & Space