Science & Mathematics - 3 February 2007

I need to make a submarine that goes down, up, down, or floats, goes down, and goes up: each for ten seconds. I can't touch it while it is in the water. I can use alka-seltzer. Pleeese Help!!! Call all of your friends, call your science project, just figure this out for me!!!

2007-02-03 11:12:25 · 3 answers · asked by guitarist123098 1 in Engineering

Put the end of a capillary tube and the miniscus pulls the water a distance up the tube. This increases the potential energy of the water without any visible outlay of energy, right? If the water came over the top of the tube in this way, could it not drive a tiny turbine? With enough of these, could we not generate infinite electricity? Where is the flaw in this plan?

2007-02-03 11:12:00 · 4 answers · asked by Anonymous in Physics

...how is it that when they change directions, they all turn at the same time. I never hear any signal or anything, they just turn. And it's never in a ripple, it's all at once. How do they do that?

2007-02-03 11:11:19 · 4 answers · asked by The Rent Is 2 D@mn High! 6 in Zoology

probability and in set 2 but surly he shoud be set 1 he got lvevl 5 maths in key stafe 2 sats. also he is in middle set science yet got lvel 5 in year 6 sats i dont think his sets are right his target for maths in year 9 is lvel 7 am i totally on the wrong track

2007-02-03 11:10:57 · 8 answers · asked by kerry g 1 in Mathematics

I've been reading a discussion about our next home after a few hundred million years at http://zaine7673.proboards104.com/index.cgi?board=astronomicaldiscussions&action=display&thread=1169131078 I was wondering, wht are the facts? as far as I know there looking at mars....

2007-02-03 11:09:15 · 18 answers · asked by zaine7673 1 in Astronomy & Space

2007-02-03 11:08:56 · 9 answers · asked by answersforyou 2 in Engineering

i cycled up the road today, then turned round, and cycled up the road again. Am i re-cycling?
I was wearing green...is this enviromentally friendly?
I farted while doing this...am i pollouting the atmosphere, should i get my emitions checked?

2007-02-03 11:08:11 · 10 answers · asked by ben b 5 in Earth Sciences & Geology

I am totally confused about these two problems. I don't even know where to begin. I have spent 2 days trying to solve these two problems. Some one please Helpppppppppp immediately.

1. A 60.0kg mass is suspended from a rope which is threaded over a mass less pulley and then attached to a hook on a vertical wall. Draw or describe free-body diagram for the mass and another for the hook and show how each is in equilibrium. Calculate the tension in each part of the rope.


2 . Pulley A is suspended from a rope E, with one end of the rope attached to the ceiling and the other end threaded over pulley B. Pulley B is suspended from the ceiling with a rope G. From pulley A a 60.0kg mass is suspended with a rope F. At the end of the rope E threaded over pulley B is a mass m which keeps the system in balance.

2007-02-03 11:07:47 · 2 answers · asked by Anonymous in Physics

2007-02-03 11:05:59 · 12 answers · asked by FishMan 1 in Biology

2007-02-03 11:05:24 · 4 answers · asked by RAFAEL G 1 in Engineering

How can the direction of flow in a properly laid drain or sewer be determined simply from an external visual inspection?

2007-02-03 11:01:25 · 6 answers · asked by Jogey 2 in Engineering

I need a long definition please.I just found very very short definitions for my question so im not really sure.

2007-02-03 10:59:48 · 9 answers · asked by Anonymous in Weather

i need to know what gold bonds with well.
or what it does not bond with well.

2007-02-03 10:59:42 · 1 answers · asked by Anonymous in Physics

what are those brown spots?

2007-02-03 10:59:19 · 4 answers · asked by Shannon 2 in Botany

finding very simple trig in real life problems
or
using very advance trig in real life problems?
I'm interested in trig, and i know what it is, well only the beginning stuff. I want to learn more but will it help me with?

2007-02-03 10:55:56 · 7 answers · asked by Anonymous in Mathematics

http://img294.imageshack.us/img294/8213/feb03002na7.jpg

2007-02-03 10:54:06 · 3 answers · asked by gftobecom 3 in Mathematics

how do u balance that chemical equation?

2007-02-03 10:53:59 · 6 answers · asked by miguels wifey 1 in Chemistry

Even though it is said that photons have zero mass at rest, if there were a bunch of them resting about some place, surely they would have some kind of effect.

2007-02-03 10:53:34 · 7 answers · asked by Shawn D 3 in Astronomy & Space

Who was the most important scientist for you ?

For me it will remain Tesla for ever..
and the Ether exists..

2007-02-03 10:53:27 · 10 answers · asked by kural_akhi 1 in Physics

So far...I have cooker shape, cooker color, panel shape, panel color.

2007-02-03 10:53:20 · 3 answers · asked by Lina 4 in Other - Science

Hi all, I need to solder a dc connection on my laptop. I bought a soldering gun from wally worl and it comes with solder but no flux. I didn't see and flux there also. Do I need it for this job? Also someone suggested to epoxy over this joint to help solidify it from future breakage. Thanks JM

2007-02-03 10:49:38 · 7 answers · asked by Anonymous in Engineering

2007-02-03 10:48:11 · 11 answers · asked by howardpbaker 1 in Astronomy & Space

How do you know stuff like: if the reaction is first order in A and second order in B, and time is measured in minutes, what are the unts for k? This is just for the general equation aA +bB --> cC +dD

2007-02-03 10:47:34 · 1 answers · asked by Kiko 3 in Chemistry

I need help with this algebraic equation: P=V^2/R

Solve for V and Solve for R

please show all work so that I can understand this

2007-02-03 10:47:00 · 9 answers · asked by King Davin 2 in Mathematics

If H is a subgroup of G, then by the centralizer C(H) of H mean the set {x in G l xh = hx for all h in H} .Prove that C(H) is a subgroup of G.

2007-02-03 10:43:49 · 2 answers · asked by poorgurl 1 in Mathematics

To pull a wagon across a lawn at a constant velocity you must exert a steady force. Reconcile this fact with Newtons first law which states that motion with a constant velocity indicates no force

2007-02-03 10:43:26 · 3 answers · asked by Bayslappers 1 in Physics

2007-02-03 10:42:27 · 6 answers · asked by tangsta_g 1 in Astronomy & Space

I have been told that it takes forever for something to cross the event horizon of a black hole. If that is true, how does anything ever get in there? And does this mean that forever has already passed in order for the black holes to be there in the first place?

2007-02-03 10:42:05 · 7 answers · asked by Shawn D 3 in Astronomy & Space

plz tell me the answer to this problem plz plz plz

2007-02-03 10:40:21 · 4 answers · asked by Sami B 2 in Mathematics

I don't want to hear because God exists, or because its in the bible, or because Jesus said so. I want to see if you can acctually use proven facts t o answer this.

2007-02-03 10:39:09 · 20 answers · asked by A nobody 3 in Biology