Science & Mathematics - 15 February 2007

Buffer capacity is the number of moles of strong acid or strong base that 1L of the buffer can absorb without changing pH by more than 1.

2007-02-15 22:35:06 · 5 answers · asked by zid nicole 1 in Chemistry

2007-02-15 22:35:01 · 9 answers · asked by Balaram 1 in Mathematics

a-a^4
-----------
a^2+a+1

I'm not so worried about the answer as much as I am the steps you take to get there...

2007-02-15 22:30:34 · 6 answers · asked by Anonymous in Mathematics

2007-02-15 22:29:16 · 6 answers · asked by Jack 1 in Physics

Three old ladies want to buy a radio, they each put £10 towards it and ask a neighbours son to go and buy it for them. He is a bit crafty and manages to strike a deal with the shop owner to get the radio for £25. He doesn't give the ladies all of the £5 change back, keeping £2 for himself, and returning £1 to each of the three ladies.

This means that each lady paid £9 towards the radio - a total of £27. The lad has kept £2 for himself. That totals £29. So what has happened to the other £1, and why?

I have sort of figured it out, but am not sure if I'm right, perhaps someone with a better mathmatical mind than mine can tell me?

2007-02-15 22:28:10 · 50 answers · asked by fallen angel 2 in Other - Science

2007-02-15 22:27:25 · 11 answers · asked by Anonymous in Engineering

Our galaxy could not be "sucked in" to the Black Hole at it's center because of the great distance between it and the nearest matter. If 95% of the universe is composed of "Dark Matter" and ergo also our Milky Way, then why isn't it feeding the Black Hole thereby increasing the event horizon to "someday" include all of the galaxy?

2007-02-15 22:24:19 · 7 answers · asked by Anonymous in Astronomy & Space

2007-02-15 22:23:06 · 27 answers · asked by muppet 4 in Zoology

I understand that 90 to 95 percent of the mass in the universe is dark matter, and this dark matter interacts only with gravity. If this is true, is it possible that there are dark worlds orbiting dark stars? Perhaps even dark galaxies?

2007-02-15 22:20:49 · 9 answers · asked by Anonymous in Astronomy & Space

Myth busted: The use of mobile phones at service (petrol) stations does not cause fires/explosions from fuel tanks and bowsers.

Static electricity is a cause of vehicles catching alight when passengers/drivers release "build up" of static electricty by touching the sides of the vehicle (when out of the vehicle) after sitting in their seats. The seats somehow conduct/produce static electricity.

2007-02-15 22:20:37 · 5 answers · asked by Anonymous in Other - Science

2007-02-15 22:20:10 · 5 answers · asked by Anonymous in Engineering

Find the next term of the sequence. (to be sure)
Determine the next term of the sequence 1,1,1,3,1,4,1,1,3,6,1,2,3,1,4, ?

2007-02-15 22:19:58 · 2 answers · asked by jamirshakur 2 in Mathematics

Do you think the world would be in better shape if humans weren't the dominate species

2007-02-15 22:17:38 · 11 answers · asked by Edward 2 in Biology

Three friends went to a hotel. The bill was Rs 75/- Each one contributed Rs.25/-.


The waiter took the bill to the cashier.


The cashier was happy & decided to give them a discount of Rs.5/- & asked the waiter to return them Rs.5/-.


Now the waiter was confused. How to distribute Rs 5 among 3 persons?


He kept Rs 2 in his pocket & gave one rupee to each one of the 3 persons.


So initially each one had contributed Rs.25. Now as they are given 1 rupee back, their contribution reduces to Rs 24.


They all contributed Rs 24 -- that is 24x3=72 & 2 rupees are in the waiters pocket.


The total becomes 74. But they had paid Rs 75.


Where is the remaining 1 rupee?.

2007-02-15 22:15:41 · 7 answers · asked by JJ 1 in Mathematics

I need to find a frequency (vibrations per second) that could not be heard by a bat.

2007-02-15 22:14:05 · 2 answers · asked by angelface77533 1 in Zoology

one by one, like a chain sequence

2007-02-15 22:14:01 · 3 answers · asked by FakieVarialFlip 1 in Astronomy & Space

Any one have the plans on how to make a yagi to transmit on 108MHz. Or any one can make me one that will not cost a lot :o)
Thanks from John.

johnrclarke@yahoo.com

2007-02-15 22:14:01 · 1 answers · asked by johnrclarke 1 in Engineering

Hubble's deep impact mission (HDIM) has captured a snap shot of a galaxy cluster, believed to have about 10,000 galaxies in a photo 10 times lesser in size of the full moon, which is believed to have located about 13-14 billion light years away. Not only this, we have learned that we have about 400 billion galaxies in the visible universe. The Hubble mission is near to the end. We are about to expand our vision, possibly with VLDM (very large diameter mirror), which is being worked out to be flown in to the space. Our earth is a tiny piece, which is merely visible suppose some intelligent life from distant galaxy finds our milky way, with amazing spiral structure. It would be very difficult to find the earth on the Orion arm. It appears that we have neighbors in the universe, but time and space factor prevents us being together. I have the only wish if humans would find the new life in the universe before I die. It would be the great achievement.

2007-02-15 22:13:15 · 6 answers · asked by Anonymous in Astronomy & Space

2007-02-15 22:11:45 · 9 answers · asked by hyaki ikari 2 in Astronomy & Space

2007-02-15 22:09:24 · 7 answers · asked by Anonymous in Astronomy & Space

a=alpha and b=bita-trigonometric

2007-02-15 22:07:53 · 5 answers · asked by Anonymous in Mathematics

Like on the 10 day forcast, it might say rain a week from now and when that day comes, its a 99% chance that it rains on that day. How do they pinpoint the weather like that?

2007-02-15 22:07:04 · 10 answers · asked by B. Gregory 2 in Weather

Education: SSCE + Diploma Automobile Endineer.

2007-02-15 22:04:07 · 4 answers · asked by dilipsinh143 1 in Engineering

2007-02-15 22:01:59 · 1 answers · asked by khartford24 1 in Mathematics

2007-02-15 22:01:33 · 3 answers · asked by ? 2 in Physics

[(4.35)/(3.2)] to the power 1/7+1 = ?

2007-02-15 21:39:49 · 8 answers · asked by Binda L 2 in Mathematics

2007-02-15 21:37:17 · 7 answers · asked by sonia 1 in Mathematics

2007-02-15 21:35:57 · 2 answers · asked by sonia 1 in Mathematics

2007-02-15 21:31:44 · 5 answers · asked by parth2004 3 in Astronomy & Space

Just saw a picture of this moon for the first time, and I was blown away by its colors! Can anyone else suggest some equally as impressive items in our Milky Way Galaxy (besides Earth :P)?

Picture of Io: http://upload.wikimedia.org/wikipedia/commons/thumb/8/85/PIA00703.jpg/750px-PIA00703.jpg

2007-02-15 21:30:36 · 6 answers · asked by havish 1 in Astronomy & Space