Science & Mathematics - 3 September 2007

On coming to a stop, a car leaves skid marks 92m long on the road. Assuming a decleration of 7.00m/s^2, estimate the speed of the car just before braking.

2007-09-03 09:11:31 · 2 answers · asked by Lizzie 1 in Physics

...is more disordered than the gas cloud it evolved from?

Sounds backwards to me. (Im trying to understand entropy)

2007-09-03 09:11:27 · 9 answers · asked by Anonymous in Physics

This one is from http://www.mindchallenger.com
The answers to most are here. Originally, this was asked to me by a friend and I actually worked this one out. It took a few minutes. How long will it take you? (some of the details are changed to make it harder for some to just look up the answer on the internet).

You have 1000 coins on HEADS. The first person changes that state of every coin: if it is HEADS he flips it to TAILS, and if it is TAILS he flips it to HEADS. The second person changes the state of every 2nd coin. The third person changes the state of every third coin. This repeats up until the 1000th person. How many coins are flipped from their initial position of HEADS?

2007-09-03 09:10:56 · 2 answers · asked by J S 2 in Mathematics

Write an equation for the quantitative relationship between H+ and OH- in aqueous solutions.

2007-09-03 09:09:33 · 2 answers · asked by Anonymous in Chemistry

does anybody who have seen them answer me.HAw does they look like

2007-09-03 09:09:30 · 11 answers · asked by Anonymous in Astronomy & Space

plzz i have chemistry class and thats my homework but i dont find it.. i look for it in google.. but i dont find it either...
if somebodys knows plz tell me..
a lot of thankz..

2007-09-03 09:09:08 · 2 answers · asked by K!R@ 2 in Mathematics

24=2^3X3
36=2^2X3^2
48=2^4X3
SORRY I ASKED AGAIN I DONT GET THIS ONE SORRY

2007-09-03 09:08:21 · 2 answers · asked by todi 1 in Mathematics

if we have no weight then its equal a mause and a lion.Can hte mause push the lion and send him far away???

2007-09-03 09:07:45 · 9 answers · asked by Anonymous in Astronomy & Space

What is the laplace transform of cos(2t-(pi/6))

I tried it, and got
[s/((s^2)+4)] e^(-s(pi/12))

does that look about right?
For the record, I used the time shifting property.

2007-09-03 09:04:14 · 2 answers · asked by Daniel 4 in Mathematics

i can't think of 15 numberss. can you help me? pleaseeeee.

2007-09-03 09:03:27 · 12 answers · asked by imaaweird0h 1 in Mathematics

He's not sure how to work this problem.

-h/3 -4=13

Thanks in advance :)

2007-09-03 09:01:17 · 15 answers · asked by miley 2 in Mathematics

This battery... for the technical minded among you, it's an alkaline battery, 9 volt battery, it's the type with two connectors on top, a rectangular cuboid. Sorry I can't think of the term for this type of battery.

Anyway, I sustained a fall, and the battery was in my pocket, along with my mobile phone, on the side that hit the ground.

Pretty soon after, the battery became hotter and hotter until I had to take it out of my pocket. It was actually too hot to handle when I took it out. Out of the pocket, it is still hot, but not as hot as it was. Could anyone explain about the increased heat? was it the shock of the impact, OR the close contact with my mobile phone, battery type BL-5C?

Thanks.

2007-09-03 09:00:22 · 5 answers · asked by Balaboo 5 in Engineering

i'm doing a report for biology, and i think cats are at the top, but i have a vague feeling that foxes prey on domestic cats. if you are going to help me please list your source.

2007-09-03 08:59:49 · 7 answers · asked by ♪♫hmm...♪♫ 2 in Zoology

...Or meters in a second. It's 1 it is? I'm getting confused.

Please answer! =] And thanks!

2007-09-03 08:59:37 · 7 answers · asked by Anonymous in Mathematics

I have to find the GCF of
24, 48, and 60

The answer in the back of my book says 12. I don't understand how they got that answer. In fact, I can't figure out how to do GCFs of anything with three terms for that matter. Could someone explain what I'm supposed to do on this sort of problem?

2007-09-03 08:52:44 · 6 answers · asked by jotaro 1 in Mathematics

2007-09-03 08:50:46 · 3 answers · asked by Anonymous in Mathematics

I forget who the name of the dude is, but basically he thinks that long ago, B.C. era, aliens came to earth, helped the egyptians and other civilization, such as Atlantis, become advanced. He also says that they looked like giant lizards, bred with humans, and that a whole line of Lizard men have been walking the earth, took powerful political possitions, and that they are in disguise as humans. He says that they consider themselves the Illumanati and are made up of people like George W. Bush, The queen of England and the like. And yes, he believes that they really are lizard people and will one day take over the Earth........so does anyone else believe this. And for the record, no I don't believe in this. Thx

2007-09-03 08:50:16 · 19 answers · asked by Caleb B 1 in Paranormal Phenomena

2007-09-03 08:49:33 · 5 answers · asked by dev 1 in Biology

What is the number of distinct 4-person committees that can be chosen from a group of 6 people?

I know I asked this question earlier, but can someone explain the steps to me?

2007-09-03 08:42:57 · 7 answers · asked by la la la 2 in Mathematics

just curious, seems interesting to know!

2007-09-03 08:42:30 · 5 answers · asked by Jupiter 2 in Astronomy & Space

its medical vocabulary (prefixes & suffixes)

2007-09-03 08:40:53 · 1 answers · asked by Anonymous in Medicine

Im so lost, because I understand what a ratio is but I dont know what it means when they say that oxegen is in a 8.0:1 mass ratio with hydrogen. I think that means for every gram of hydrogen there is 8 grams of oxegen.

My textbook said that with this information we can conclude that with the h2o formula that oxegen atoms are in fact 16 (not 8) not times heavier than hydrogen.

I dont get it. I understand that for every gram of H there has to be 8 O. So with 2 grams of H there are 16 grams of O.

But how can oxegen be sixteen times one hydrogen atom when the ratio is 8:1? Shouldnt it oxegen only be 8 times the hydrogen.

2007-09-03 08:40:43 · 4 answers · asked by Anonymous in Chemistry

describe the safe way to deal with each of these items:long hair,jewelry,,contact lenses,cosmetics,food.

2007-09-03 08:38:42 · 1 answers · asked by NICE G 1 in Chemistry

its medical vocabulary (prefixes & suffixes)

2007-09-03 08:38:30 · 3 answers · asked by Misti M 1 in Medicine

2007-09-03 08:36:09 · 5 answers · asked by dr_jr_solorio 1 in Mathematics

Does anyone know why scientists think a full moon effects people.... makes them act weird.

2007-09-03 08:35:52 · 7 answers · asked by Anonymous in Astronomy & Space

its medical vocabulary (prefixes & suffixes)

2007-09-03 08:35:10 · 2 answers · asked by Misti M 1 in Medicine

2007-09-03 08:32:10 · 3 answers · asked by kyrov 1 in Physics

I can't comprehend them.
i understand i need to find the common denominator and my teacher told us we're only going to use 2,4,6,8,16. no longer than that but i still don't understand since some are mixed and others aren't.

Here's an example of a few I'm working out.. rephrase.. stressing on..

http://i19.tinypic.com/625yt1j.jpg

2007-09-03 08:32:00 · 5 answers · asked by Jessie 1 in Mathematics

2007-09-03 08:31:15 · 6 answers · asked by quasar 2 in Astronomy & Space