Science & Mathematics - 29 January 2007

2007-01-29 13:23:47 · 11 answers · asked by AL IS ON VACATION AND HAS NO PIC 5 in Medicine

2007-01-29 13:23:47 · 6 answers · asked by Chook 2 in Zoology

It is possible to have almost an infinite number of tones or frequencies between a given fundamental note and its octave. So why are there 8 notes in our musical scale. Any real reason ? Or is it just tradition ? 12 semitones is another case.

2007-01-29 13:23:22 · 5 answers · asked by democracynow 2 in Mathematics

Does any one know the answer to 110=2x+10.

And is able to show thier work

2007-01-29 13:23:15 · 7 answers · asked by SmartyPants 1 in Mathematics

2007-01-29 13:21:52 · 14 answers · asked by Anonymous in Mathematics

Tana bought $74.12 worth of CDs @ a music store. Since she is an employee of the store she received a 19% discount. What was the actual price of the CDs she bought before the discount?

2007-01-29 13:21:16 · 13 answers · asked by Shamil 1 in Mathematics

I understand that nature uses various systems such as the Fibonacci Series etc etc. But is there one mathematical system that nature prefers above all others at a fundamental level ?

2007-01-29 13:18:48 · 8 answers · asked by democracynow 2 in Physics

there are 50 stars on the flag so what is the

2007-01-29 13:17:14 · 12 answers · asked by Jeff K 1 in Geography

S is the region inside the circle r=4cosθ and outside the circcle r=2

2007-01-29 13:17:05 · 1 answers · asked by Astalav 1 in Mathematics

2007-01-29 13:16:29 · 3 answers · asked by Anonymous in Physics

2007-01-29 13:15:04 · 5 answers · asked by Anonymous in Earth Sciences & Geology

2007-01-29 13:14:18 · 21 answers · asked by Anonymous in Mathematics

MONEY - SEND = MORE

each letter represents only one digit. what digit does each letter represent?

2007-01-29 13:13:54 · 6 answers · asked by Anonymous in Mathematics

2007-01-29 13:13:40 · 8 answers · asked by mookie 1 in Astronomy & Space

thank you

2007-01-29 13:11:42 · 1 answers · asked by elQuintosaurio 5 in Weather

solve the following differential equations
I am having trouble with starting the following equations
a) dy/dx + ysec(x)tan(x) = e^-sec(x) , y(0) = 0

b) dy/x = (x^2 +3y^2)/2xy y(1) = 2
[HINT - on the right side, divide the top and bottom by x^s and use substitution v = y/x]

2007-01-29 13:10:16 · 2 answers · asked by bently 1 in Mathematics

|x-7| ≻ -5
i know how to do the problem but iam not sure on the answer

2007-01-29 13:10:16 · 1 answers · asked by Jen Bug <3 2 in Mathematics

know either

4x-2y=3

solve for y but please tell me in steps how to do it

2007-01-29 13:09:56 · 5 answers · asked by paperhearts 4 in Mathematics

3.95 g of a hydrocarbon, C20H16, were burned in excess oxygen in a constant-volume calorimeter surrounded by 1300. g of water. As a result the temperature of the water and the calorimeter rose from 21.0 oC to 25.7 oC. The heat capacity of the calorimeter was 255.642 J/oC.


Calculate DE (kJ/mol) for the combustion of the hydrocarbon based on these readings.


Enter a numeric answer only, do not include units in your answer.

2007-01-29 13:09:34 · 1 answers · asked by yani_sabree 2 in Chemistry

Calculate the standard enthalpy change in kJ for the production of 15.2 g of CO2 (g) from a reaction where the reactants and products are:

reactants: CH4 (g) O2 (g)

products: CO2 (g) H2O (g)

2007-01-29 13:09:07 · 1 answers · asked by yani_sabree 2 in Chemistry

Arrange from smallest to largest.

50%, .9, 5/4, 5%

2007-01-29 13:08:40 · 2 answers · asked by Pink*advice 2 in Mathematics

2007-01-29 13:08:00 · 2 answers · asked by chrisletheby 1 in Chemistry

2007-01-29 13:07:07 · 3 answers · asked by Anonymous in Biology

please, help! (physics)

2007-01-29 13:06:56 · 3 answers · asked by CHI U 3 in Engineering

2007-01-29 13:05:53 · 4 answers · asked by Anonymous in Mathematics

a gas sweeting process

2007-01-29 13:04:53 · 6 answers · asked by qazi 1 in Engineering

2007-01-29 13:04:47 · 6 answers · asked by Anonymous in Mathematics

The bible speaks of a new heaven and a new earth. It says 'the elements shall melt with a fervent heat'. Is it possible that a 'fervent heat' was how these chemical elements were created in the first place ?

2007-01-29 13:03:08 · 3 answers · asked by democracynow 2 in Chemistry

2007-01-29 13:01:57 · 11 answers · asked by hintzruby 1 in Astronomy & Space

can any one solve 6^(2x)=90 and show me how thanks

2007-01-29 13:01:39 · 2 answers · asked by Ryan 1 in Mathematics