Science & Mathematics - 1 October 2007

so i can explain to my son. I never took Pre-Algebra

2007-10-01 11:13:39 · 5 answers · asked by MELANIE L 1 in Mathematics

What's the difference between cold and warm fronts?

2007-10-01 11:13:27 · 3 answers · asked by ? 1 in Weather

Give the names of the following compounds:

1.) Al203 = dialuminum trioxide right guys? I have no clue. I tried to work them out on my own, but I would like other people's input.

2.) Ammonium hydroxide =

3.) Bismuth(3)chloride =

4.) Copper(2)sulfate =

5.) Silver carbonate =

6.) Sodium bicarbonate =

7.) Tin(4)oxide =

8.) (NH4)2S=

9.) NiF2=

10.) H2S04(aq)=

11.) K2Cr2O7=

12.) Calcium cyanide=

13.) Copper(1)sulfide=

14.) Sb(ClO3)3=

15.) KCN=

16.) Formula for Ammonia=

17.) Aluminum fluoride=

18.) Chloric acid=

19.) Arsenic (3) oxide=

20.) Chromium (3) sulfite=

21.) Pb(HCO3)2=

22.) Ni(MnO4)2=

23.) AgC2H3O2=

24.) Arsenic (3) iodide=

25.) Titanium (4) bromide=

Thank You!

2007-10-01 11:08:05 · 2 answers · asked by danie 2 in Chemistry

2007-10-01 11:04:19 · 1 answers · asked by Buck BUCK 2 in Engineering

What would be the effects of an explosion completely tearing away Hoover Dam? How large of an area would be flooded? How many would lose power due to power supply being cut of from this source? What would be all the effects including possible casualties if this ever happened?

2007-10-01 11:01:25 · 7 answers · asked by Anonymous in Geography

My mom has a black tounge, she is not on any new medicene, and hasn't eaten anything but a bagel. help, is it serious???

2007-10-01 11:01:06 · 2 answers · asked by tink7155 2 in Medicine

2007-10-01 10:59:23 · 8 answers · asked by Nezar 1 in Weather

Determine any relative maxima or minima of the function and the intervals on which the function is increasing or decreasing.

f(x) = x^2 -2x +3

2007-10-01 10:59:03 · 4 answers · asked by Anonymous in Mathematics

2007-10-01 10:58:30 · 2 answers · asked by jimmy 1 in Engineering

can you tell if it is a compound or a mixture? Explain.
you cant right? but i dont know how to explain

2007-10-01 10:56:56 · 8 answers · asked by Anonymous in Chemistry

Write a slope intercept equation for a line passing through the given point that is paraelle to the given line. Then write a second equation for a line passing through the given point that is perpendicular to the given line.

(8, -2), y = 4.2(x - 3) + 1

2007-10-01 10:56:32 · 5 answers · asked by Anonymous in Mathematics

Is that 7x?

2007-10-01 10:55:28 · 10 answers · asked by Nicole W 2 in Mathematics

2a² + 6a=8 , a=?

2007-10-01 10:55:27 · 4 answers · asked by iHeartChem 2 in Mathematics

I love science but one thing has always bugged me about chemistry. How in the world is it even possible for Oxygen to have an atomic weight of 15.9994 which is LESS than 16? Every other element has a weight equal to its number of protons and neutrons. (Or more if it is an isotope.) Is there some rare form of Oxygen (O 15) where it actually has one less neutron and is a lighter isotope? This is the only possible explanation I can come up with. I realize that Hydrogen (Protium) has only a proton and is missing its neutron. (Then there are the 2 heaver forms, Duterium and Tritium.) But other than Hydrogen there are NO other examples in the whole periodic table where there is a lighter isotope (missing a neutron) other than that. If this is NOT the reason why Oxygen has a weight less than 16.0000 please tell me WHY is does? Thank you very much.

2007-10-01 10:55:01 · 3 answers · asked by Becky 3 in Chemistry

4.00 cm2 in cross-sectional area. A) Determine the elongation of the cable. B) By what additional amount does the cable increase in length if the object is accelerated upward at a rate of 3 m/s2? C) What is the greatest mass that can be accelerated upward at 3 m/s2 if the stress in the cable is not to exceed the elastic limit of the cable, 2.2 x 108 Pa?

I've worked out the problems below but I'm not sure if I did the calculations correctly. If you see an blatant errors, please point them out. Thank you :)

A) F/A= Y(Change in L)/ L
800 kg = 7840 N
7840 N/ 4 x 10^-4 m^2 = (20 x 10^10 Pa)(change in L)/ 25.0 m
Change in L = 2.45 mm
B) F=(mass)(acceleration)
F=(3.0 m/s^2)(800 kg) = 2400 N
F/A= Y(Change in L)/ L
2400 N/ 4 x 10^-4 m^2 = (20 x 10^10 pa)(change in L)/ 25 m
change in L = 0.75 mm
C) F=mass x acceleration
F= (3.0 m/s^2)m
F/A = 2.2 x 10^8 Pa
(3.0 m/s^2)m / (4 x 10^-4 m^2) = 2.2 x 10^8 Pa
m = 29333.3 kg

2007-10-01 10:53:40 · 2 answers · asked by Diff 1 in Physics

If AD = 2x + y, BC = 7y - 2x, and x = 3, find AD

plz explain....is it like this
2x + y
2(3) + y
6 + y
if it is like this^ what is 6+y equal to?

2007-10-01 10:51:37 · 9 answers · asked by Anonymous in Mathematics

1. 5x+9-4x=17

2. x+10-7x=-44

3. 10+5x+6x=98

4. x+2-7x=-34

5. -2x-6+x=6

6. 1=x-5x+9

7. 35=-4x+7x-1

8.10+3x-7x=10

9.-3+x+3x=41

10.5-5x-3x=-51

11. 4x+8-x=8

12. 3=6x-4x-9

13. -6x+2+x=17

2007-10-01 10:50:13 · 2 answers · asked by Anonymous in Mathematics

n elevator (cabin mass 570 kg) is designed for a maximum load of 2300 kg, and to reach a velocity of 3.5 m/s in 3 s. For this scenario, what is the tension the elevator rope has to withstand?

2007-10-01 10:50:07 · 1 answers · asked by jULIAN C 2 in Physics

2007-10-01 10:47:37 · 5 answers · asked by Anonymous in Physics

I need the answer for the science... Beside being food for the dragonflies, why does ticks exists to begin with?
I need help.

2007-10-01 10:45:59 · 3 answers · asked by Anonymous in Zoology

2007-10-01 10:45:22 · 1 answers · asked by Anonymous in Mathematics

2007-10-01 10:44:58 · 4 answers · asked by navy15seal 1 in Mathematics

Given t1/2 to be 0.0133 seconds, how long should it take to reach 87.5% of maximum charge?
time = _________________seconds.
(Answer with three significant figures or N/A if there is no answer.)

please help and explain how to do this, thanks

2007-10-01 10:43:37 · 1 answers · asked by Anonymous in Physics

A spherical soap bubble with radius of 2 cm lands on a flat surface. Its shape changes to that of a hemisphere. Assuming that none of the air inside the bubble escapes, determine the radius of the hemisphere.

2007-10-01 10:42:00 · 2 answers · asked by Anonymous in Mathematics

I'm not anti-evolution. I'm just wondering, how can a species evolve from asexuality to sexuality? Would it have to go through a period where it could do both?

And what came first, the ability to have sex to have kids, or the pleasure the comes from having sex? Neither would help much without the other.

2007-10-01 10:41:32 · 3 answers · asked by PW 2 in Biology

a car started out from mephis toward little rock at the rate of 60 km/h. a sceond car left from teh same point two hours later and drove along the same route at 75 km/h. how long did it take for the second car to overtake the first?

please EXPLAIN your answer<3
and fyi, im doing my own homework, i got 80 minutes for this problem, but im almost sure its rong and i dont know why...

2007-10-01 10:39:29 · 6 answers · asked by suni 5 in Mathematics

1. Iceland consists of several small islands. Some of its land mass was formed by:
a. layers of ice sheets
b. volcanoes
c. Land moved by glaciers
d. Coral reefs

2. "Salarium" was an allowance of salt given to Roman soldiers. Later, it became money they were given to buy salt. What does this special form of payment tell us about salt in ancient Rome?

2007-10-01 10:31:23 · 5 answers · asked by surmy 2 in Geography

calculate the rate of change of the volume of a cube (V) with respect to its surface area (A)

2007-10-01 10:31:12 · 1 answers · asked by Mr. Vill 1 in Mathematics

2007-10-01 10:30:13 · 4 answers · asked by Anonymous in Physics

y=1+2 x+6 x2.

Find the slope of the tangent line to the parabola at the point where x=4.

2007-10-01 10:29:34 · 3 answers · asked by Ar J 2 in Mathematics