Science & Mathematics - 17 October 2007

2007-10-17 05:25:10 · 40 answers · asked by lil shorty 2 in Astronomy & Space

(a) CO3^2-/OH-
(b) CO3^2-/HCO3-
(c) H2O/OH-
(d) H2O/HCO3-

2007-10-17 05:22:59 · 1 answers · asked by Jenn S 2 in Chemistry

What do these mean exactly?

2007-10-17 05:20:43 · 3 answers · asked by Anonymous in Chemistry

2007-10-17 05:18:15 · 1 answers · asked by biakk91 1 in Chemistry

1. Find the points P and Q on the parabola y=1-x^2 so that the triangle ABC formed by the x-axis and the tangent lines at P and Q is an equilateral triangle.

2. Find the point where the curves y=x^3-3x+4 and y=3(x^2-x) are tangent to each other, that is, have a common tangent line.

3.A car is traveling at night along a highway shaped like a parabola with its vertex at the origin. The car starts at a point 100 m west and 100 m north of the origin and travels in an easterly direction. There is a statue located 100 m east and 50 m north of the origin. At what point on the highway will the car's headlights illuminate the statue?

4. Use linear approximation (or differentials) to extimate the given number:
sin(1 degree)

Answers to all or any of the questions would be great! Thanks!!!!

2007-10-17 05:16:27 · 2 answers · asked by jellybean0424 2 in Mathematics

2007-10-17 05:15:23 · 3 answers · asked by Anonymous in Physics

What does Butterfly milkweed need to survive??? Plz tell me Plz.

2007-10-17 05:14:25 · 3 answers · asked by Boo 2 in Zoology

2007-10-17 05:14:24 · 4 answers · asked by torlin30 1 in Mathematics

2007-10-17 05:13:37 · 24 answers · asked by Anonymous in Geography

What does Butter and eggs the flower need to survive??? Plz tell me i need to kno.

2007-10-17 05:13:33 · 5 answers · asked by Boo 2 in Biology

A 114 g frisbee os lodged omn a tree branch 7.65 m above the ground.To free it,you lob a 240 g wad of mud vertically upward.The mad leaves your hand at a point 1.23m above the ground moving at 17.7 m/s.it sticks to the frishbee.Find a)the maximum height reached by the frishbee-mud combination and b)the speed with which the combination hits the ground.

2007-10-17 05:12:38 · 2 answers · asked by john m 1 in Mathematics

Find the equation of the plane through point (-1, 4, 2) that contains the line of intersection of the planes:
4x - y + z - 2 = 0 and
2x + y - 2z - 3 = 0

By making y = t, I found the intersecting line equation to be:
x = 7/10 + 1/10 t
y = t
z = -4/5 + 3/5 t.

So this direction is <1/10, 1, 3/5>

Where do I go from here? The answer in the back of the book is:
4x - 13y + 21z + 14 = 0

I'd appreciate any help.

2007-10-17 05:08:42 · 4 answers · asked by MathGuy 6 in Mathematics

the subjects for this laboratory medicine program include pathology, microbiology, immunology, haematology, histopathology, cytopathology

biology or chemistry?

2007-10-17 05:08:31 · 6 answers · asked by Anonymous in Medicine

2007-10-17 05:07:17 · 5 answers · asked by Anonymous in Physics

Balance each chemical reaction by adding the appropriate coefficients: (20K)

a) Cu + O2 --> CuO
b) Al + NiCl2 --> Ni + AlCl3
c) Cl2 + NaBr --> NaCl + Br2
d) Fe + CuF2 --> Cu + FeF3
e) Na + S --> Na2S
f) C5H12 + O2 --> CO2 + H2O
g) HCl + Mg --> MgCl2 + H2
h) NaOH --> Na + O2 + H2
i) Cl2 + KI --> I2 + KCl
j) 3 C + Fe2O3 --> Fe + CO2
When a solution becomes more basic, does the pH increase or decrease? Explain.

Explaining Factors that Affect Rates of Reactions
Factor
-How factor affects the rate of a chemical reaction
-Explanation using collision model

temperature,
concentration of reactants
surface area
catalyst

2007-10-17 05:07:02 · 3 answers · asked by Anonymous in Chemistry

I've got what I hope is a basic probability question...in a nutshell:

Assume that an event will only occur if three conditions are met. Each condition has an individual probability of occuring...for the sake of argument, condition 1 has a 1 in 5 chance, condition 2 has a 1 in 10 chance, and condition 3 has a 1 in 20 chance.

Using the individual probabilities, how do you determine the probability of the event occuring?

2007-10-17 05:06:34 · 1 answers · asked by poeticjustice72182 3 in Mathematics

has anybody heard the theory that whales evolved from massive beras? and is it true I know it sounds like a stupid thing to say if u havent researched it but it could actually be true, I think that scientists have found bones in the fins that are similar to bear's paws!

2007-10-17 05:06:08 · 7 answers · asked by diz 2 in Biology

2007-10-17 04:56:07 · 22 answers · asked by rainbow*lily 2 in Astronomy & Space

I've been noticing this star or planet for several weeks.

2007-10-17 04:54:37 · 5 answers · asked by Daniel C 1 in Astronomy & Space

Would it line up perfectly? Like if you were at that point where the moon perfectly fit over the Earth, would the Earth and Moon, then also fit perfectly over the Sun?

2007-10-17 04:54:34 · 3 answers · asked by Anonymous in Astronomy & Space

What are the general equations for the oxidation of primary, secondary and tertiary alcohols.

Also what is the general equation/s for the reaction of alcohols with sodium?

2007-10-17 04:53:43 · 1 answers · asked by Anonymous in Chemistry

2007-10-17 04:51:49 · 4 answers · asked by Anonymous in Physics

I only suggest the outer brim because wouldn't it make sense that the beginning of time would be there opposed to the center? And, what is currently happening at the center of the universe? Are hydrogen atoms still forming stars?

2007-10-17 04:48:31 · 3 answers · asked by Jansen J 4 in Astronomy & Space

3) Styrofoam is a polymer containing carbon and hydrogen. Assume the formula is C8H8. How many molecules are in a 0.2 g styrofoam peanut? How many protons and electrons are in this peanut if it carries no excess charges? How many coulombs of positive and negative charge does this represent? If the peanut has an excess charge of 0.05C, how many of its electrons has it gained or lost?

2007-10-17 04:47:57 · 1 answers · asked by sdajc0603 2 in Physics

2007-10-17 04:45:58 · 8 answers · asked by Anonymous in Botany

It says something like this:
"Numbuer ONE exists and is unique".

Thanks.

2007-10-17 04:41:18 · 2 answers · asked by kamelåså 7 in Mathematics

I don't know too much about Squids but i'm just curious

2007-10-17 04:40:10 · 8 answers · asked by Anonymous in Zoology

there is another u in another world/universe/place? could be evil u or nice u or whatever u in that world.

2007-10-17 04:38:43 · 12 answers · asked by Tea Lover 3 in Astronomy & Space

I have a pocket PC with a USB charger that connects to the 220v wall plug. It gives 5 volts and 1 amp.

Then my brother lost his Motorola and gave me his charger. It's also USB, also 5 volts, but only 0.55 amps.

It would be convenient if I could have one more in use for the PDA. But... shall I try it? Is it safe?

Thanks in advance!

Rock

2007-10-17 04:35:25 · 2 answers · asked by Rock S 1 in Engineering

I need data of all the USA.

2007-10-17 04:35:15 · 3 answers · asked by dudejca 2 in Weather