Science & Mathematics - 8 October 2006

Apparently the Romans did not recognize siltstone as a rock different from shale or sandstone. Thank you to all who tried to answer the question about the latin word for silt.

2006-10-08 16:28:34 · 3 answers · asked by David A 5 in Earth Sciences & Geology

I went to a lecture on Saturday on Time Travel with the speaker as Nobel Laureate Anthony J. Leggett. I didn't quite understand his British accent. But can time travel backwards? I wonder if it's possible...

2006-10-08 16:28:06 · 9 answers · asked by iceui2 2 in Physics

2006-10-08 16:25:35 · 4 answers · asked by jomyboyrain 1 in Medicine

135
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2006-10-08 16:22:10 · 5 answers · asked by prettiful! 1 in Mathematics

Factor Completely. 3x(x-5y)-8(x-5y) please show me how to do this in detail

2006-10-08 16:22:03 · 9 answers · asked by George F 1 in Mathematics

How do we prove that, for a positive integer n, a 2^n x 2^n square grid with any one square removed can be coverd using L-shaped tiles of the following shape
_
l_l_
l_l_l

2006-10-08 16:19:33 · 4 answers · asked by Ann T 1 in Mathematics

please you will send me photographes and detail of moon and son.

2006-10-08 16:16:02 · 6 answers · asked by shaif_vhora 1 in Astronomy & Space

just wondering

2006-10-08 16:15:21 · 14 answers · asked by purpleplaid87 3 in Weather

I work on ultraound processes, Can someone suggest some materials which i can build the reactor so that the sound waves are reflected inside th vessel instead of passing away from the reactor?

2006-10-08 16:14:46 · 1 answers · asked by Gangadhar A 1 in Physics

2006-10-08 16:00:10 · 1 answers · asked by Anonymous in Biology

how would that compare to a cell with just plain water on it?

2006-10-08 15:55:09 · 2 answers · asked by =]] 2 in Other - Science

We found that pennies can be put into 2 different groups by mass. Why are there 2 types of pennies and when did we chagne how they were used. Please help I'll really appreciate it!

2006-10-08 15:52:38 · 2 answers · asked by izzy_009 1 in Other - Science

We found that pennies can be put into 2 different groups by mass. Why are there 2 types of pennies and when did we chagne how they were used. Please help I'll really appreciate it!

2006-10-08 15:52:25 · 4 answers · asked by izzy_009 1 in Other - Science

2006-10-08 15:50:14 · 12 answers · asked by phathead962003 1 in Chemistry

2006-10-08 15:46:37 · 2 answers · asked by Lee J 1 in Biology

The moon affects the tides, as clouds are water does the moon also affect them?

Often the waves will make ripples on the sand - and I have seen clouds take the same shape - any similarities?

2006-10-08 15:45:15 · 10 answers · asked by purity14kb 2 in Weather

Seems to be a lot of people who think we never went to the moon. Why can't we point Hubble at the moon to verify the stuff we left there? That telescope see's things million's of light years away..

2006-10-08 15:41:03 · 8 answers · asked by mr.longshot 6 in Astronomy & Space

I want to learn how to make my own simplistic particle accelerator, for *ehm* a bit of a project of mine. However, I would like to be able to create one, that would give me quantative, or at least qualatative results. Anyone have any ideas, or ways to help me do this?

2006-10-08 15:39:13 · 9 answers · asked by k soni 2 in Physics

2006-10-08 15:38:38 · 5 answers · asked by srj_corp 1 in Other - Science

I need a simple electronic circuit or technique that could tell if the sternum or any bone was located directly under the skin. Ultrasonic sensors are generally very expensive. Is there any other cheap way?

2006-10-08 15:34:41 · 2 answers · asked by Mobilab 1 in Engineering

name who and what engineering field???

2006-10-08 15:33:42 · 3 answers · asked by The Apostle 2 in Engineering

2006-10-08 15:33:33 · 29 answers · asked by Yassou ~ Mikey 1 in Weather

I'm trying to do a school project - I have a light and a fan to work with. I have to have both of them working at the same time with a on and off switch. I need to know how to do that? Help please!!!

2006-10-08 15:32:51 · 2 answers · asked by Sugars 3 in Other - Science

Okay, this is a tough one:

1/√(2*π) * ∫ (z^2 * exp(-(1/2)*z^2) dz)
-∞ to +∞

This is related to probability. Why is it that the area under the curve is 1? I understand that the area under a normal distribution pdf is 1, but I don't see how multiplying it by z^2 affects it. You don't need to prove it mathematically if you can explain it intuitively.
Thanks

2006-10-08 15:30:13 · 4 answers · asked by rmtzlr 2 in Mathematics

Type ur COUNTRY STATE AND CITY then type HOW THE WEATHER IS WHERE U ARE, then ANSWER THE FOLLOWING QUESTION WITH A YES OR A NO and a reason for your answer.....

THE QUESTION: Do u like weather? Why?

2006-10-08 15:27:07 · 11 answers · asked by Yassou ~ Mikey 1 in Weather

book banning in Texas

2006-10-08 15:26:23 · 3 answers · asked by Anonymous in Biology

2006-10-08 15:25:39 · 1 answers · asked by brook 1 in Chemistry

2006-10-08 15:25:21 · 3 answers · asked by lia r 1 in Chemistry

at an average rate of 1.69 x 10^6 kg/s, & half the potential energy of the water was converted into electric energy, how much power would be produced by the falls (in units of MW)? Acceleration of gravity is 9.81 m/s^2

2006-10-08 15:25:18 · 5 answers · asked by Mariska 2 in Physics

Ok, i know there is Telekinesis, Pyrokinesis, and Hydrokinesis....

Is there any other "kinesis" things? if so, what are they? and what do they do?
For example, Pyrokinesis is fire, Hydrokinesis is water...

2006-10-08 15:23:41 · 1 answers · asked by Anonymous 2 in Other - Science