Science & Mathematics - 8 November 2007

Explain what will happen to BaSO3 if we add:
1-dil HCL
2-dil HNO3
3-acetic acid

2007-11-08 06:02:02 · 1 answers · asked by mohamed r 1 in Chemistry

2007-11-08 05:58:30 · 2 answers · asked by Anonymous in Chemistry

A diffraction grating with 230 lines per mm is used in an experiment to study the visible spectrum of a gas discharge tube. At what angle from the beam axis will the first order peak occur if the tube emits light with wavelength of 686.2 nm?

At what angle will the second order peak occur?

i used the sin theta = wavelength/distance eqn and i got .00904 for the first one and .0181 for the second one and i got both of them wrong any suggestions?

2007-11-08 05:56:33 · 2 answers · asked by meeh 1 in Physics

Please help me :D

2007-11-08 05:56:30 · 1 answers · asked by ~!~ Red Head ~!~ 1 in Chemistry

How does a doctor know if sperm cells are defective?
How big are they?
If a human's is so small, how small must an ant's be?
Do they knock each other out of the way in the fight to the egg?

2007-11-08 05:52:37 · 2 answers · asked by Anonymous in Biology

wavelength = 632.8 [nm] how do i convert this to millimeters??

2007-11-08 05:51:33 · 3 answers · asked by Anonymous in Physics

2007-11-08 05:49:48 · 13 answers · asked by C S 2 in Chemistry

2007-11-08 05:49:27 · 2 answers · asked by sonal p 1 in Biology

Suppose X and Y have joint density f(x,y) = e^(-x-y) for x,y > 0. What is the covariance of X and Y?

2007-11-08 05:49:00 · 2 answers · asked by cornzxo1 1 in Mathematics

it's been so long that i've done these type of problems. please show the steps. also, 3 - 2 3/4

2007-11-08 05:47:04 · 6 answers · asked by Papi Tony 3 in Mathematics

Over this past year I've been devoting my free time & apart of my life to EVP. My laptop is filled with a large amount of audacity files from my deceased dad to my grandpa. I had this idea of publishing a book about it. My 2 local public libraries had no paranormal section/books.

1. How would I start the book
2. Would people read/buy it, etc.

2007-11-08 05:46:29 · 5 answers · asked by Anonymous in Paranormal Phenomena

2007-11-08 05:43:56 · 2 answers · asked by Cece jara 1 in Mathematics

2007-11-08 05:43:46 · 2 answers · asked by Anonymous in Mathematics

Topic Sentence:
Does earth’s gravity affect plant growth?
Hypothesis:
I think the earth’s gravity will affect the plant growth by forcing the plant’s stems to go upwards, away from the earth’s core, and the seeds reaching towards the earth’s core; because that is how they usually grow.

I have three weeks, so I cannot grow my own little plants, I'll have to buy three pre-grown plants.
But I'm still not sure.

My question is:
How can I "flip" the plants, so they are not standing upright like they usually are, with having the soil and seeds falling out of the see-through plastic cups?

2007-11-08 05:42:41 · 2 answers · asked by Anonymous in Botany

I'm supposed to design a scheme to seperate the cations Ca and Pb based on the concept of precipitation and the differences in solubility. I got the first one - adding Cl to a solution of Ag and Cu will cause AgCl to precipitate while Cu remains in solution - but my brain refuses to cooperate with me any further. Anyone willing to offer a jump start?

2007-11-08 05:42:21 · 6 answers · asked by Marji 4 in Chemistry

2007-11-08 05:40:09 · 8 answers · asked by KHAOS4NOW 1 in Astronomy & Space

a. <1 = 79, <2 = 101

b. <1 = 40, <2 = 140

c. <1 = 40, <2 = 150

d. <1 = 79, <2 = 111

2007-11-08 05:38:09 · 5 answers · asked by Anonymous in Mathematics

How do you do the following:

1) ∫ x² * e^(px) dx
2) ∫ x² * e^(-px) dx

2007-11-08 05:36:36 · 3 answers · asked by cornzxo1 1 in Mathematics

A satellite orbits Saturn at twice the distance of the Moon from the Earth. Its period is 8 days .Many times more massive than the Earth is Saturn?

2007-11-08 05:31:03 · 2 answers · asked by la_belle_creole_2000 1 in Physics

Exactly how many full moons do we have in one year. (one rotation of earth around the sun)

2007-11-08 05:29:32 · 18 answers · asked by Anonymous in Astronomy & Space

2007-11-08 05:29:23 · 2 answers · asked by Rune Morrigan 1 in Astronomy & Space

solve : x^ - x - 20 = 0

i have:
(x - 5) (x +4)
x - 5 = 0 or x + 4 = 0
so x =5 or x = -4

use your results to solve:
(2t + 2/t) ^ - (2t + 2/t) - 20 = 0

i have:
2t + 2/t = -4 or 2t + 2/t = 5
2t^ + 2 + 4t = 0 or _________
2t^ + 4t + 2 = 0 or 2t^ - 5t + 2= 0
(t ) (t ) =0 or (t ) (t )


can someone tell me where i'm going wrong and help me fill in the blanks plz? thanks! :)

2007-11-08 05:25:39 · 5 answers · asked by plasticbag 2 in Mathematics

I really do have an answer for it, but I might post some more of these because I get a kick out of some of the answers people give.

2007-11-08 05:25:30 · 7 answers · asked by Brant 7 in Astronomy & Space

Just wondering if its possible to improve an invention, or a product thats currently out in circulation ...?

Inventing, yes... you can ... but how do you get a product into circulation...?


TNX

2007-11-08 05:21:54 · 3 answers · asked by Anonymous in Engineering

Can they disprove the people who reckon it never happened?

I'm very doubtful it took place!!

2007-11-08 05:20:48 · 28 answers · asked by Nutty 3 in Astronomy & Space

2007-11-08 05:19:31 · 6 answers · asked by Anonymous in Zoology

A planet orbits a star at a distance of 40 AU and has an orbital period of 80 years, what is the mass of the star ( express in solar masses)

2007-11-08 05:18:56 · 2 answers · asked by la_belle_creole_2000 1 in Physics

and has to share 1/4 of those bribes with the mayor.

FBI determined that monetary transactions between the mayor and the judge are conducted by court clerk who passes enevolopes stuffed with cash, who also blackmailed both officials into paying him too. The mayor has to pay 1/6 of money received in each envelope from the judge, and the judge has to pay 1/8.

FBI also managed to obtain search warrant and dug up a chest packed with $500,000 cash in clerk's garden.

What combined amount of money was payed in bribes in the town?

2007-11-08 05:16:35 · 2 answers · asked by Alexander 6 in Mathematics

2007-11-08 05:16:33 · 8 answers · asked by Mercury 2010 7 in Astronomy & Space

Using factoring I solve this so that x=0 and x=3pi/2. Once I get to this point I'm unsure what to do. I'm told to put the x value in place of sin x and solve but I can't see an example of this. Additionally I'm not sure how to finish solving, I understand that I should get 4 answers because each x value is added to 2pi.

Can someone show me the solution by replacing sin x with the values.

2007-11-08 05:14:53 · 1 answers · asked by Krys F 1 in Mathematics