Science & Mathematics - 29 January 2007

Answer in an hour

2007-01-29 04:22:46 · 25 answers · asked by Sir Sidney Snot 6 in Zoology

2007-01-29 04:21:33 · 34 answers · asked by Rachel T. 2 in Astronomy & Space

Do they pile up into a single point (singularity)? If it continues to move, does its velocity decrease or even increase? Do light particles get destoyed there? If yes, then into what? Or do they behave just as they do in normal situations? How would light 'appear' to 'someone' present inside the black hole (let us assume so), should 'he' happen to be in line with light's motion? Would he be able to feel its presence? Basically, what I actually want to ask is, what goes on inside a black hole -- its thermodynamics, entopy & other properties?

2007-01-29 04:19:39 · 13 answers · asked by Kristada 2 in Astronomy & Space

Do you believe in your astrology sign?

2007-01-29 04:18:30 · 13 answers · asked by Susie Q~ 1 in Astronomy & Space

Looking for something simple, this is a first year physics class for me.

2007-01-29 04:17:15 · 3 answers · asked by wencar29 1 in Physics

2007-01-29 04:17:14 · 15 answers · asked by sizzy1969 2 in Earth Sciences & Geology

O(0,0),A(4,6),B(8,3) are vertices of the triangle OAB.Find:
1)Te equation of the median OM.
2)The equation of the altitude.
3)The co-ordinates of the 4th vertex C of the parallelogram OABC.

2007-01-29 04:17:12 · 5 answers · asked by Anurag 2 in Mathematics

Have you ever looked up at the moon and see a huge perfect circle of light around it, well what causes this?

2007-01-29 04:16:54 · 2 answers · asked by someoneelse 2 in Astronomy & Space

BOMDAS (Brackets Of Multiplication Division Addition Subtraction) is accepted for arithmetic order of operations (I understand that the order of some of them can be swapped about). But how did this come about? What if a different order was created before this - Addition Subtraction Brackets Of Multiplication Division, for example? Would that have been possible at all? Am I overlooking something?

2007-01-29 04:16:13 · 10 answers · asked by Simplicity 1 in Mathematics

First prepare a stock solution that is 1.00 x 10-2 M in phosphate ion. How many g of Na3PO4 would you add to a 50 mL volumetric flask to to prepare this solution?

What is this concentration in ppm of phosphate?

2007-01-29 04:15:15 · 2 answers · asked by Anonymous in Chemistry

Why do we have two nostrils instead of one in the middle of our noses?

2007-01-29 04:15:10 · 10 answers · asked by ladee_in_luv 2 in Biology

2007-01-29 04:12:25 · 12 answers · asked by its me 1 in Astronomy & Space

job opportunities,high salary

2007-01-29 04:11:58 · 2 answers · asked by pranav j 1 in Engineering

2007-01-29 04:11:43 · 2 answers · asked by Debbie G 2 in Engineering

sound waves

2007-01-29 04:11:39 · 5 answers · asked by bjb 1 in Physics

Alright, my 4yo daughter asked me this and I said no. But how do they get nutrients in the egg? Isn't there a connection between GI tract and the yolk of the egg?

2007-01-29 04:11:35 · 4 answers · asked by Cindy B 5 in Zoology

2007-01-29 04:09:25 · 9 answers · asked by its me 1 in Astronomy & Space

2H2(g) + O2(g) --> 2H2O(g) ΔH = −486.6kJ



Which of the following are true statements for the above chemical reaction ?



a) A phase change is involved


b) Two moles of hydrogen gas react with two moles of oxygen gas to
produce two moles of water vapor


c) Energy is absorbed by the system, the reaction species


d) If the reaction takes place at constant pressure, q = −483.6 kJ


e) ΔH for reacting four moles of hydrogen gas with two moles of
of oxygen gas is −977.2 kJ

2007-01-29 04:09:14 · 3 answers · asked by Anonymous in Chemistry

2007-01-29 04:07:24 · 4 answers · asked by majeti k 1 in Mathematics

MgSO4 → Mg2+(aq) + SO42−(aq)

the change in enthalpy must be −91.3 kJ/mol



How much heat (kJ) is lost or gained by 309.0 ml of water when 5.40 g of MgSO4 is dissolved in the water ?

2007-01-29 04:06:49 · 1 answers · asked by Anonymous in Chemistry

2007-01-29 04:06:15 · 8 answers · asked by Anonymous in Physics

2007-01-29 04:05:32 · 1 answers · asked by burritohat 1 in Mathematics

recently we've been doing physics coursework at school. we had to make sensors using fixed resistors as part of a potential divider circuit. since we had to choose a resistor of a specific value on our own, some kid didn't choose the right one and soon after he turned his power pack on at 6 Volts and connected it to his rotary potentiometer, smoke started coming out of the fixed resistor and it stank really badly.
my question is, what makes a fixed resistor burn like that? was it because he chose a very small resistance or a large resistance? was it because of excess electric charge in the circuit or excess electric current? what makes a component in an electric circuit burn like that? could i have some kind of scientific explanation pls? i need it for my coursework.

2007-01-29 04:04:45 · 6 answers · asked by amandac 3 in Physics

If you don't know enough about the subject to be able to answer it without a cut+paste, how do you know the information that you are cut+pasting is correct?

2007-01-29 04:03:31 · 9 answers · asked by Nick F 6 in Biology

How many ways are there to put 3 one dollar bills and 10 quarters into 4 boxes?

2007-01-29 04:03:12 · 3 answers · asked by burritohat 1 in Mathematics

why do people say we can't achieve the speed of light? Whos to to say that there isn't a force out there, that exceeds the speed of light... could it be that such a force is invisible?

2007-01-29 04:00:20 · 6 answers · asked by Jerry 2 in Astronomy & Space

2007-01-29 03:59:56 · 7 answers · asked by its me 1 in Astronomy & Space

This question goes to an analytical chemsit or biochemist or to an enzymologist. As it is mentioned above, what is the use of measuring enzymatic reaction by two analytical methods, like measuring by polarograph and spectrophotometer ?

2007-01-29 03:59:13 · 2 answers · asked by behailubgu 1 in Chemistry

also tell me how they affect the body

2007-01-29 03:59:07 · 3 answers · asked by gaugemusick 1 in Physics

2007-01-29 03:56:41 · 7 answers · asked by Tiffany C 1 in Weather