Science & Mathematics - 20 August 2007

Hi, I'm an Australian high school physics student currently studying the effects of high energy living upon the environment. As a physics student, I need to prove the steps I've made to reduce my household's carbon footprint with relevant physics equations/support. An example of this would be how reducing a hot water system's overall temperature would result in the saving of energy (q=mcT, reduce T to reduce q). Can anyone provide me with more examples pertaining to reducing household emissions?

2007-08-20 23:58:37 · 3 answers · asked by Anonymous in Physics

I am aware that radio or television static is caused by backround radiation or something(more info on this would also be good).

How could I harness this, and what electrical components would I need?

2007-08-20 23:49:42 · 3 answers · asked by worried person 1 in Engineering

A local farmer here in Ireland says we'll have a brilliant September because 'the storks have gone up the mountain' So far he just maybe right!

2007-08-20 23:41:00 · 22 answers · asked by Christine 6 in Weather

In Physics

2007-08-20 23:20:02 · 7 answers · asked by chitha 1 in Engineering

2007-08-20 22:56:59 · 1 answers · asked by Muhammad A 1 in Medicine

2007-08-20 22:54:10 · 8 answers · asked by angiefloyd1977 1 in Weather

Please give the solution?

2007-08-20 22:50:24 · 5 answers · asked by jp 1 in Engineering

http://img251.imageshack.us/img251/625/segfvu0.jpg

Is there anyway I can get rid of that x beside the cos? or is the answer just 0?

2007-08-20 22:47:24 · 2 answers · asked by osiris_2kk 2 in Mathematics

base is 229.43 sides 200
angles 35, 35 and 70

thanks!

2007-08-20 22:37:35 · 6 answers · asked by sweetmango 2 in Mathematics

Also please state how would you make it!
What are the ingredients you are going to use and what is the title of your product!

2007-08-20 22:27:57 · 1 answers · asked by Anonymous in Chemistry

2007-08-20 22:23:34 · 1 answers · asked by John Michael C 1 in Chemistry

FeCl- Iron (III) chloride

2007-08-20 22:17:50 · 2 answers · asked by John Michael C 1 in Chemistry

2007-08-20 22:12:30 · 20 answers · asked by Anonymous in Earth Sciences & Geology

The number of moles of any gas dissolving in water:


a. is independent of the temperature of the water
b. is independent of the gas used
c. is dependent on the volume of water used
d. is independent of the gas pressure above the water

2007-08-20 22:08:53 · 1 answers · asked by chengdu 1 in Chemistry

I also heard that if the water is cold, the risk increases. Anybody can explain the reason and possible risks?

2007-08-20 22:06:57 · 7 answers · asked by eylemya 2 in Medicine

Use calculus to find the volume of a cap of a sphere with height "h" and radius "r".

HERE IS THE IMAGE!
http://hw.math.ucsb.edu/webwork/math3b-01-MB07/tmp/gif/5-prob6-prob6_2_49.gif

10 pts. for the correct reasonable answer!

2007-08-20 21:52:14 · 5 answers · asked by ohsnapps 2 in Mathematics

Why everything in the Universe tends towards complexity ? Do you thing the Universe- I mean everything that exists - possesses some kind of intrinsic "conciousness"? By that I don't mean that sort of brain-dependent conciousness similar to human beings, but rather a consciousness far beyond that of human beings, one defined in terms of natural laws ?

2007-08-20 21:44:18 · 4 answers · asked by ?? 5 in Other - Science

The speed of train A is 16mph slower than the speed of train B. Train A travels 23o miles in the same time it takes train B to travel 310 miles. Find the speed of each train.

2007-08-20 21:38:16 · 4 answers · asked by Anonymous in Mathematics

I note that Nutrition News Focus and Journal of the American
Medical Association (April 21, 1999), seem to be taking the position that the link between dietary and blood cholesterol is not particularly strong.

Is this position generally accepted by scientists or to appease some pressure groups? Pray tell.

2007-08-20 21:33:39 · 23 answers · asked by Anonymous in Medicine

where else can salt reproduce..and HOW does a person extract it from the ocean?

Thanks!

2007-08-20 21:31:17 · 4 answers · asked by ladyk 2 in Earth Sciences & Geology

Human or Volcanic activity?

2007-08-20 21:26:59 · 6 answers · asked by Dunk 3 in Earth Sciences & Geology

i can come up with the general formula for the DE but since there are complex eigenvalues and eigenvectors i get lost when converting it to sine and cosine, just wandering if there is a simpler way to this without expanding out the whole equation and then simplifying.

an example is:

x' = 3x -5y
y' = 4x -5y

2007-08-20 21:24:06 · 2 answers · asked by Anonymous in Mathematics

2007-08-20 21:14:08 · 21 answers · asked by Anonymous in Biology

2007-08-20 21:11:26 · 4 answers · asked by ravi p 1 in Engineering

2007-08-20 21:06:32 · 4 answers · asked by ? 3 in Earth Sciences & Geology

It really keeps my mind blurred!!!Niel armstrong,Niel armstrong and many more Niel Armstrong.....But my FRESHMEN teacher say's that it was just a big bunch of lie!!!Cause if really NIEL ARMSTRONG stepped into the moon.....then surely many people would go & go over the moon,right?Huhhuhuhu....Please help me!!!I NEED YOUR ANSWER.......

2007-08-20 21:01:54 · 21 answers · asked by Anonymous in Astronomy & Space

2007-08-20 20:46:25 · 4 answers · asked by Anonymous in Weather

(f/d^2) / (f^2/d^3) please help

2007-08-20 20:43:34 · 4 answers · asked by Anonymous in Mathematics

To determine the number of deer in a game preserve, a conservationist catches 803 deer, tags them and lets them go. later 400 deer are caught, 200 of them are tagged, how many deer are in the preserve?

2007-08-20 20:41:11 · 5 answers · asked by Anonymous in Mathematics

1) A 500 mL sample of helium gas contains 2.0 moles of gas at 300 K.
(a) Find the pressure exerted by the particles.
(b) If the temperature is doubled and half of the gas escapes, what will be the new pressure?

2) Oxygen gas is released from a cylinder at the rate of 10 m^3 per hour at atmospheric pressure. If it is sold at a pressure of 200 atm and has a volume of 2.0 m^3, for how long will it supply oxygen?

Please help me do these 2 questions (and explain the steps) because I’m really having trouble with these 2. THANX to everyone who can help!! =D

2007-08-20 20:37:47 · 4 answers · asked by ♥ Victory ♥ 3 in Chemistry