Science & Mathematics - 22 July 2007

Total number, global

2007-07-22 15:08:03 · 2 answers · asked by Tyrone 3 in Geography

2007-07-22 15:07:42 · 2 answers · asked by lulu 1 in Chemistry

2007-07-22 15:02:57 · 3 answers · asked by Pat 1 in Botany

Two equations:
x^2 / (1+x^2) and rx-s where r>0 and s>=0
Is there a way to find out in which cases they intersect 1,2, or 3 times in terms of r and s without dealing with a nasty cubic equation?

2007-07-22 15:02:24 · 1 answers · asked by tzz1985 2 in Mathematics

i heard you can get like 20 or 50 bucks for donating your blood. how exactly do you do that. i live in san francisco, if anyone knows give me a location where i can do it.

2007-07-22 14:57:33 · 3 answers · asked by clueless 1 in Medicine

2007-07-22 14:55:23 · 7 answers · asked by Travell B 1 in Mathematics

2007-07-22 14:54:09 · 8 answers · asked by stp52x 3 in Astronomy & Space

2007-07-22 14:52:06 · 8 answers · asked by Reserved 6 in Earth Sciences & Geology

Up until 1973 we used the Saturn V rocket the last time was to launch Skylab I believe...Then if I remember it wasn't until 1981 when the space shuttle was first launched...So what did we use between 73 and 81 for manned space flight?

2007-07-22 14:42:11 · 4 answers · asked by Anonymous in Astronomy & Space

Lithium and Nitrogen react to produce lithium nitride.

6Li(s) + N(subscipt 2)(g) yields 2 Li (subscipt 3)N(s)

If 3.50g of each reactant are used, the theoretical yield of lithium nitride is

A) 3.52g
B) 5.85g
C) 17.6g
D) 2.93g
E) 8.7g

2007-07-22 14:42:02 · 2 answers · asked by ~daweed~ 3 in Chemistry

Given the regression line of y-hat = 1.46x + 17.46 and y-bar = 54 where x is the population and y is the monthly sales, calculate the residual for a city of population of 10 thousand whose monthly sales are 40 thousand.

a. 7.94

b. -7.94

c. 63.04

d. 32.06

2007-07-22 14:40:42 · 3 answers · asked by Anonymous in Mathematics

2007-07-22 14:40:21 · 2 answers · asked by Anonymous in Chemistry

2007-07-22 14:36:15 · 12 answers · asked by Michael B 1 in Geography

PROBLEM SOLVE:
x² -6x = 216

I know how to factor it's just that 216 is a big freaking # I can't break it down, and even more harder is when I ever I get a number that matches I need to subtract so I can get "6" IMPOSSSIBLE!

2007-07-22 14:32:05 · 12 answers · asked by Anonymous in Mathematics

For electric forces, similar charges repel and opposites attract. For magnetic forces, similar poles repel and opposites attract.

How come magnetic forces acting between wires, appear to violate this symmetry? How come it is not a violation (only appears to be a violation)?

2007-07-22 14:30:34 · 4 answers · asked by Anonymous in Physics

It's maybe a silly notion, but I saw the article concerning the ISS tossing out junk; then I had this horrible image in my mind of Pepsi Cola sponsoring "global meteor shower 2007" by heaving a bag of sand into an orbit that'll bring it back into the atmosphere.

2007-07-22 14:28:37 · 6 answers · asked by Anonymous in Astronomy & Space

pine like cones.. The tree has leafs all over it ( no needles) with small green (pine) cones.. I never seen a deciduous tree that produces a cone. Help me identify? Thanks

2007-07-22 14:28:31 · 4 answers · asked by Cergio S 2 in Botany

2007-07-22 14:26:53 · 9 answers · asked by Jason C 3 in Mathematics

[Identify the conjugate acid/base pairs in the following reactions. For the first pair, list the acid from the reactant side first. For the second pair, list the base from the reactant side first.]


1) HC2H3O2 + H2SO4--------> H2C2H3O2 + HSO4-
_____________ and ____________(1st pair)
***Reactant choices: HSO4(-), H2SO4, HC2H3O2, or
H2C2H3O2(+)
***Product choices: H2SO4, HC2H3O2, H2C2H3O2(+), or
HSO4(-)

________ and ___________ (2nd pair)
***Reactant choices: H2SO4, HC2H3O2, H2C2H3O2 (+), or
HSO4(-)
***Product choices: H2SO4, H2C2H3O2(+), HC2H3O2, or
HSO4(-)

2007-07-22 14:26:02 · 2 answers · asked by Anonymous in Chemistry

Hi This is for my Chemistry Lab 5C follow up questions, it goes

1. In some industrial processes, solutions have impurities removed by single replacement reactions. In electrolytic zinc processes, for instance, impurities of cadmium in the form of CdSO4 are removed from the electrolyte by the addition of zinc dust. Write a balanced equation for this reaction.
2. Write the balanced equation for the electrolysis of water. What type of reaction is this?

Thanks in advance

2007-07-22 14:25:46 · 2 answers · asked by playpwnsu 2 in Chemistry

For all of the following experiments, under standard conditions, which species could be spontaneously produced?

A lead wire is placed in a solution containing Cu2+
[Yes or No ] Pb2+
[Yes or No ] Cu
[Yes or No ] PbO2
Cl2 gas is bubbled into a solution of NaI.
[Yes or No ] No reaction
[Yes or No ] Cl-
[Yes or No ] Na
Crystals of I2 are added to a solution of NaCl.
[Yes or No ] I-
[Yes or No ] No reaction
[Yes or No ] Na

Thanks in advance

2007-07-22 14:24:40 · 1 answers · asked by thamvo08 1 in Chemistry

2007-07-22 14:24:19 · 10 answers · asked by Anonymous in Physics

a. less than its weight
b. more than its weight
c. its weight
d. zero

2007-07-22 14:20:51 · 4 answers · asked by eastfieldgiirl04 1 in Physics

2007-07-22 14:19:44 · 2 answers · asked by Anonymous in Chemistry

Also, is there a website that lists all of the known prime numbers?

2007-07-22 14:19:35 · 6 answers · asked by Anonymous in Mathematics

1)2p-3r +t for p=10 r=-4 and t=5

2)p^2-r^2 for p=10 r and t=5

2007-07-22 14:19:02 · 8 answers · asked by percy m 1 in Mathematics

how can i graph this? /or solve it?

2007-07-22 14:14:10 · 3 answers · asked by Anonymous in Mathematics

2007-07-22 14:13:06 · 13 answers · asked by Anonymous in Mathematics

i mean,how could they have taken pictures of the galaxies??

2007-07-22 14:07:23 · 12 answers · asked by Anonymous in Astronomy & Space

write the integral as the sum of the integral of an odd function and the integral of an even function.

integral from -4 to 4; (x^3+6x^2-2x-3)dx

(the integral has 4 at the top and -4 at the bottom)

2007-07-22 14:05:24 · 2 answers · asked by LISA C 1 in Mathematics