Science & Mathematics - 12 October 2006

http://news.bbc.co.uk/2/hi/science/nature/5398784.stm

2006-10-12 13:26:44 · 8 answers · asked by babylonian_sai 3 in Chemistry

I'm stuck on a Physics problem-
A 7.5 kg block is resting on a horizontal surface, and is connected to a 5.50 kg mass suspended from a string passes over a frictionless pulley. Find the acceleration of the system and the tension in the string if the surface is:
(a)
smooth, and
(b)
the coefficient of friction is 0.190

I have found the acceleration of the system with the smooth surface, but i can't find the tension in the two strings or the acceleration of the system with the coefficient of friction.....

Any help is greatly appreciated.....

2006-10-12 13:26:35 · 3 answers · asked by Anonymous in Physics

2006-10-12 13:26:04 · 10 answers · asked by xscarredapplex 1 in Chemistry

please help.... thankyou

2006-10-12 13:24:52 · 1 answers · asked by Tess 1 in Earth Sciences & Geology

most bacteria cells are..

A) 10 times larger then an average eukaryotic cell
B) as large as an average eukaryotic cell
C) one-tenth the size of an average eukaryotic cell
D) double the size of an average eukaryotic cell

2006-10-12 13:21:55 · 10 answers · asked by Anthony T 1 in Biology

From a statistics course 40 years ago I thought 16. I listed them and came up with 24. What the? Perhaps the correct term is permutations.

2006-10-12 13:20:30 · 9 answers · asked by Ned 3 in Mathematics

a female cat got her tail cut off in an accident. a few months later she had 8 kittens

2006-10-12 13:20:10 · 6 answers · asked by andrew 3 in Physics

In a baseball league of ten teams, Joseph's team is currently in the first place with thirty-five wins. Benjamin's team is eight games behind Joseph's team. Sydney's team is three games behind Benjamin's team. In the next forty games, Benjamin's team won four less than the number of games won by Joseph's team. Sydney's team won fourteen less than the number of games won by Benjamin's team. Three times the number of games won by Joseph's team, during these forty games, was eighty-eight more than the number of games won by Sydney's. The sum of the games won by these three teams after the complete season is 169. How many games did each of these three teams win?

2006-10-12 13:18:09 · 2 answers · asked by darkangel020202 1 in Mathematics

2006-10-12 13:15:32 · 5 answers · asked by chasse l 3 in Other - Science

I know a lot of people have already seen this, but I'm trying to create an electromagnet that can pick up at least 2lbs. Is it possible?

2006-10-12 13:14:28 · 1 answers · asked by burnholywater 2 in Physics

log5 125 =

2006-10-12 13:14:03 · 8 answers · asked by Anonymous in Mathematics

PLease name these

Fel2
MnF3
CrCl2
CuS

2006-10-12 13:13:04 · 3 answers · asked by baby*Phat 2 in Chemistry

2006-10-12 13:10:44 · 6 answers · asked by Anonymous in Zoology

2006-10-12 13:10:01 · 11 answers · asked by Anonymous in Biology

I'm stuck on a Physics problem-
A 7.5 kg block is resting on a horizontal surface, and is connected to a 5.50 kg mass suspended from a string passes over a frictionless pulley. Find the acceleration of the system and the tension in the string if the surface is:
(a)
smooth, and
(b)
the coefficient of friction is 0.190

I have found the acceleration of the system with the smooth surface, but i can't find the tension in the two strings or the acceleration of the system with the coefficient of friction.....

Any help is greatly appreciated.....

2006-10-12 13:08:55 · 2 answers · asked by Anonymous in Physics

Graph: http://img90.imageshack.us/img90/7800/1hy7.png
Please explain if possible.

2006-10-12 13:07:59 · 8 answers · asked by Jamaal 5 in Mathematics

please help me people !
thanks ! i know its not possible poeple..but please think of an idea ! thanks !

2006-10-12 13:05:36 · 14 answers · asked by Anonymous in Earth Sciences & Geology

2006-10-12 13:04:50 · 4 answers · asked by hasan05842 3 in Other - Science

Also, how would you find your latitude/longitude based on your area using Polaris?

2006-10-12 13:04:34 · 4 answers · asked by signortribuzio303 2 in Earth Sciences & Geology

how much current flows through the component?

2006-10-12 13:04:32 · 4 answers · asked by Anonymous in Physics

The equation of the circle with center at (5, 6) and radius of 7 is ____

CHOICES:
x2 - y2 = 49
(x - 5)2 + (y - 6)2 = 49
(x - 5)2 - (y - 6)2 = 49
(x + 5)2 + (y + 6)2 = 49

2006-10-12 13:01:31 · 14 answers · asked by britiani j 1 in Mathematics

of the metal nickel if the temperature of a 32.2 gra, sample is increased 3.5° C when 50.0 joules of heat is added? Please tell me the work it took you to figure this problem out as well, thanks.

2006-10-12 12:58:42 · 3 answers · asked by San Fran Kid 2 in Chemistry

When I asked my doctor he was clueless. What I would like is a genetic profile. I know that they are out there and that they would be able to look at certain markers in my dna to see if cancer, or heart problems can crop up. Recently my blood brothers have had children and I would love to know what I would be passing on to my children if I get the chance to have any.

2006-10-12 12:55:40 · 4 answers · asked by Too Cool For Me 4 in Other - Science

elements are made of proton, electron and nuetron. electron is a fundamental particle. but proton and nuetron are made of three fundaments particles each. (quarks). if we can even divide protons into three different particles, then why does my professor say elements cant be broken any further?

2006-10-12 12:54:13 · 5 answers · asked by DJ Deep 3 in Physics

I have to fing elements that are synonyms or substitutes for each of the clues
Example: A Policeman= Copper (cop)
Mickey Mouse's dog= Plutonium (pluto)

These are the ones i'm stuck on:

directed (past tenese)
A ships kitchen
Lone rangers Horse
what u do before u brand a beer
a red flower
A army officer
funds from Mom's sister
takes 2 to make 10 cents

2006-10-12 12:53:14 · 11 answers · asked by Mia16 3 in Chemistry

2006-10-12 12:50:14 · 7 answers · asked by keval s 1 in Biology

I have no idea how to do this. i have a whole page of notes on it but i still dont get it.
i need to create formulas to the following:
1)barium chloride and ammonium carbonate
2)barium chloride and ammonium phosphate
3)calcium chloride and ammonium carbonate
4)calcium chloride and ammonium phosphate
5)strontium chloride and ammonium carbonate
6)strontium chloride and ammonium phosphate

i was told to:
a)find the symbols
b)find the oxidation states
c)criss cross and drop signs
d)reduce
but i dont understand...??? please help me, and possibly give me the answers but show me how you got them

2006-10-12 12:49:46 · 5 answers · asked by um yea hi 4 in Chemistry

2006-10-12 12:49:40 · 1 answers · asked by keval s 1 in Biology

My basic question is this. Suppose you build a time machine and travel back 40 years in the past as a 50 year old man, Will you still be a 50 year old person in 1966 or will you be a boy of 10? If somehow you make it to the past, is it possible to travel "back" into the future? Or is it impossible because the future hasn't happend yet? I am just curious and this is strictly theoretical!

Thanks!

2006-10-12 12:46:14 · 17 answers · asked by Anonymous in Other - Science

2006-10-12 12:45:28 · 10 answers · asked by doubleK 2 in Other - Science