Science & Mathematics - 15 January 2007

There are 3 more red toothpicks than blue toothpicks. A toothpick is chosen at random. Each toothpick is equally likely to be chose. If the probability that a blue toothpick is chosen is 3/7, how many red toothpicks are there and how many blue toothpicks are there?

2007-01-15 08:19:08 · 11 answers · asked by Laretta J 1 in Mathematics

2007-01-15 08:18:56 · 2 answers · asked by norcalgoldmine 1 in Chemistry

My car has a 13.7 gallon tank. Assuming that gasoline is entirely made from octane(C8H18), how many POUNDS of CO2 would be froduced from my car each time I use a tank of gas? How many pounds of CO2 will produce from my car each year(I drive 21,500 miles each year)?
Some equalities you may find useful
- 1 lbs- 4536 kg
1 kg-2.205 lbs.
28.35g-3.785 liters
l inch-2.54 cm
density of octane-.855g/ml
my car averages 29.7 miles/gallon

use the following equation
C8H18 + 12 1/2 O2 --> 8 CO2 + 9H2O
if u can find the answer and show work, it would be greatly appreciated. Please hlp. thx It would be nice if u can show step by step using factor labeling or something. Please show work, and if steve sees this he didnt answer both parts

2007-01-15 08:18:56 · 3 answers · asked by coolphill517 1 in Chemistry

When NASA launch a spacecraft they say for example:- " T minus 2 minutes".
What does the T mean?
Many thanks.

2007-01-15 08:16:28 · 15 answers · asked by Anonymous in Astronomy & Space

I have heard all the arguements saying it is, not I wasnt all the ones saying it isn't. I'm rather scared I will catch stupidity by diffusion, but I'll be brave :-)

Please, no people answer telling me how it IS equal, your answer will be reported. My question only asks for proofs of it not being equal.

2007-01-15 08:15:14 · 11 answers · asked by Anonymous in Mathematics

i am so confused aboutthe absolute value can you tell how do i work with it like for example if i have [ -2 +i ] becarfule i mean about the absloute sign not the brakets

2007-01-15 08:14:48 · 1 answers · asked by what ever ? 2 in Mathematics

can a pressure sensitive diode be built ?
1) a nano pipette containing a rochelle piezo crystal
2) zinc wool extruding on one open end as ground reference
3) zinc, copper, iron, magnesium wools extruding
on the other open end
4) small as they can be and batched billions per vat
in a conductive gelatinous agar
5) will this process produce ... pressure sensitive piezo diodes
and will they , batched together , form logic arrays ?
finally , can this be made into some sort of organic computer
or even a Cyborg like biochip ?

2007-01-15 08:13:01 · 1 answers · asked by stevenos_2005 2 in Engineering

2007-01-15 08:12:59 · 3 answers · asked by vietster 2 in Engineering

2007-01-15 08:11:35 · 9 answers · asked by psycho 1 in Geography

2007-01-15 08:06:15 · 2 answers · asked by A H 1 in Earth Sciences & Geology

i need it for my emt class

2007-01-15 08:04:58 · 7 answers · asked by kimberly l 1 in Zoology

We are making a launching system of any type with any materials (like slingshot, catapult) that can go 20 to 60 yards.....It needs a calibration system too. The distance the launcher goes (20 to 60 yards) will be announced at the beginning of launching day.. What is a good idea with basic steps for this project?

2007-01-15 08:04:57 · 3 answers · asked by kiki 1 in Engineering

My son is in the 5th grade and is doing a science fair project. He is testing the buoyancy of a aluminum foil ball filled with ten pennies, compared to a aluminum foil boat filled with ten pennies.
Now this may be cheating, but I have no idea what to do, so I can't help him much so I need some help.
What are variables? And how are they used here?
Thanks.

2007-01-15 08:04:54 · 9 answers · asked by charliesangel 2 in Other - Science

I've read about how bread becoming toast is a chemical change/reaction, but I don't know why. Can someone please explain this for me? =]

2007-01-15 08:04:46 · 5 answers · asked by Anonymous in Chemistry

Heres some riddle for all them science nerds out there! sry if u dont like to be called nerds, i'm a science nerd and dont really mind it haha

-i am a nonmetal that has 4 valence electrons, properties similar to carbon, and an atomic mass slightly less than phosphorus.what is my identity what element am i?

- I am an element that has 5 valence electrons, i show properties of metals and non-metals and i have 33 protons in the nucleus of each atom what is my identity, what element am i?

-I am a highly active metal that has 1 valence electron and 55 protons in the nucleus what's my identity what element am i?

get 2/3 right or 3/3 right and you will be selected as best answer!! and recieve 10 points! fortuna bona! wale!
good luck, so long!

2007-01-15 08:04:44 · 2 answers · asked by !¿question!? 2 in Chemistry

2007-01-15 08:04:12 · 3 answers · asked by wildlife_montana 2 in Weather

a) the numerator on one side by the numerator on the other side, and the denominator on the side by the denominator on the other side

b) the numerator on the left side by the denominator on the left side, and the numerator on the right side by the denominator on the right side

c) the numerator on the left side by the denominator on the right side, and the denominator on the left side by the numerator on the righ side

d) both numerators by both denominators

2007-01-15 08:03:46 · 6 answers · asked by Anonymous in Mathematics

The log base of 2 means that the 2 is the little subscript

2007-01-15 08:01:59 · 6 answers · asked by mexicanthug 2 in Mathematics

[i got this wrong on a test and i would like to know what the correct answer is and how to get it]

A)9.54J
B)146J
C)11,700J
D)79,100J

this is what i did
q=mC(delta)T
x=35.0(4.18)(273)
but i didnt even get one of the answers. i put A, but that was wrong.
help??

2007-01-15 08:01:54 · 2 answers · asked by um yea hi 4 in Chemistry

Do you have any websites with this info?

2007-01-15 08:01:07 · 2 answers · asked by loira74 2 in Astronomy & Space

Does the independent variable=cause and dependent variable=effect?

2007-01-15 08:00:44 · 2 answers · asked by biancaonwenu 2 in Chemistry

Just in case the power goes out or we can not go outside.

2007-01-15 08:00:37 · 10 answers · asked by vtowngirl08 2 in Weather

Also I have been told that cold water comes to a boil faster than hot water, is this true? If yes, why?

2007-01-15 07:59:44 · 2 answers · asked by Anonymous in Chemistry

'Why Asynchronous Counter are named as Ripple Counter, Explain.

2007-01-15 07:59:04 · 1 answers · asked by Muhammad A 1 in Physics

Also I have been told that hot water freezes faster, is this true and if so why?

2007-01-15 07:58:29 · 27 answers · asked by Anonymous in Physics

2007-01-15 07:57:46 · 5 answers · asked by axlvtt 2 in Weather

2007-01-15 07:57:39 · 4 answers · asked by Anonymous in Mathematics

Say the water was in the upper 50s F. The person was possibily in shock. What actions would be taken? Would they cover the person with a blanket to keep them warm? Would they give them an medicine. If so, what? What other actions might they take?

2007-01-15 07:56:54 · 4 answers · asked by Frank L. Butterscotch 2 in Medicine

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2007-01-15 07:56:53 · 11 answers · asked by Austin L 1 in Chemistry

2007-01-15 07:54:14 · 1 answers · asked by hero112@sbcglobal.net 1 in Physics