Science & Mathematics - 15 November 2007

2007-11-15 09:46:22 · 21 answers · asked by bubbles 2 in Mathematics

i researched and i clicked on a link that said ,yes, by 2039! Pleease!

2007-11-15 09:45:48 · 13 answers · asked by charde2b11 1 in Astronomy & Space

why do cold fronts occur? why do they happen? thanks so much!!

2007-11-15 09:44:32 · 3 answers · asked by malleydog99 3 in Weather

My AP Chem teacher gave us this assignment to do, and i don't know how to do it, so help me please.

The assignment says:
"The best buffers consist of half-neutralized weak acid. When that happens the buffer can resist the greatest amount of added acid or base, and pH=pKa, as shown in the H-H equation.

However, fairly effective buffers can be made where [A-]/[HA] is not exactly 1.00, but farily close (0.20-5.00).

Your task is to select an appropriate weak acid and give directions to make one liter of buffer that will have a pH equal to a given value.

Your buffer can be 0.5-1.0M HA with and appropriate amount of A-."

The pH value given to me was 6.00

Please help me do this.

2007-11-15 09:42:51 · 1 answers · asked by Curtis D 1 in Chemistry

Find the acute angle theta in degrees and radians without a calculator

sec theta = 2

thanks in advance

2007-11-15 09:42:45 · 11 answers · asked by XzoeyX 2 in Mathematics

2007-11-15 09:42:10 · 3 answers · asked by MJ 1 in Biology

How reflective is a solar semiconductor compared to a mirror when the mirror be at say 99% reflectivity?

2007-11-15 09:41:55 · 1 answers · asked by Ben 2 in Physics

of an atom which has half as many protons as Si (mass no. 28) and 6 fewer neutorns than atom of Si (mass no 28).

Give symbol, mass no, and atomic no

2007-11-15 09:39:14 · 2 answers · asked by Anonymous in Chemistry

What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/10 the speed of light?
_____m

2007-11-15 09:38:43 · 1 answers · asked by w_rayas07 1 in Earth Sciences & Geology

VW is the median of a trapezoid that has bases MN and PO, with V on OM and W on PN. If the vertices of the trapezoid are M(2,6) , N(4,6), P(10,0), and O(0,0), find the coordinates of V and W. Our teacher said to use Midpoint to figure it out but thats all she said but im confused can someone out there help?

2007-11-15 09:35:39 · 6 answers · asked by coolgirl1376 3 in Mathematics

and what would the electron configuration look like? well even if you can only the first question that would help thanks

2007-11-15 09:35:37 · 7 answers · asked by rst41 2 in Chemistry

2007-11-15 09:33:51 · 8 answers · asked by Anonymous in Mathematics

2007-11-15 09:32:15 · 5 answers · asked by mikey 3 in Paranormal Phenomena

2007-11-15 09:30:13 · 3 answers · asked by J.S N 1 in Mathematics

4/2+3x5-2^2

I first solved the exponent, so the new equation is:

4/2+3x5+4

Then I solved the division and multiplication:

2+15+4

which came to equal 21.

Am I right? I don't quite understand this, the answer key I'm using tells me the correct answer is 13.

2007-11-15 09:29:37 · 8 answers · asked by Kay 1 in Mathematics

Helpppp.


laskjfd;ls.

2007-11-15 09:29:20 · 5 answers · asked by Mariah M 1 in Mathematics

on a level ice surface( coefficient of friction = 0.1) two boys stan facing each other 0.15m apart. one has a mass of 45kg and the other 65kg. the smaller boy pushes the bigger boy with a force of 55N for o.4s. At the en of the push how far apart will the boys be? THANK YOU

2007-11-15 09:28:38 · 1 answers · asked by arandjbar15 2 in Physics

Or any other kind of sixth sense?

2007-11-15 09:27:08 · 24 answers · asked by Anonymous in Parapsychology

A circular coffee table has a diameter of 5ft. What will it cost to have the top refinished if the company charges $3 per square foot for the refinishing?

2007-11-15 09:26:08 · 4 answers · asked by Bnbadangel 1 in Mathematics

Explain each step and check.

2007-11-15 09:24:00 · 2 answers · asked by Anonymous in Mathematics

2007-11-15 09:23:24 · 5 answers · asked by yashar a 3 in Mathematics

f'(x)= (8/x^2) - (4/x^6)

fins f(x) when f(1)=0

2007-11-15 09:21:55 · 3 answers · asked by Lauren 1 in Mathematics

Where and When?

2007-11-15 09:20:23 · 17 answers · asked by mikey 3 in Other - Alternative

2007-11-15 09:18:43 · 1 answers · asked by Terry A 1 in Earth Sciences & Geology

When solving an exponent such as -2^2, would you multiply by -2x-2, or -2x2? So in other words, do you have to multiply by a negative exponent for each?

2007-11-15 09:18:42 · 5 answers · asked by Kay 1 in Mathematics

Janice invested $12,000 into two funds. One of the funds returned 6 percent interest and the other returned 8 percent interest after one year. If the toal interest for the year was $880, how much did she invest in each fund?

2007-11-15 09:17:32 · 3 answers · asked by ??? 4 in Mathematics

Two vertical poles of lengths 6 ft and 8 ft stand on level ground, with their bases 10 ft apart. Approximate the
minimal length of cable that can reach from the top of one pole to some point on the ground between the poles
and then to the top of the other pole.

2007-11-15 09:16:38 · 2 answers · asked by deadman 2 in Mathematics

2007-11-15 09:16:17 · 2 answers · asked by mightyfiiiine 1 in Chemistry

Please Help With the following Multiple Choice:

Which of the following is NOT a true description of gas behavior?
a) There is an inverse relationship between pressure and volume and for a fixed mass of gas confined at constant temperature
b) There is a linear relationship between temperature and volume at constant pressure
c) There is a linear relation between pressure and temperature at constant volume
d) For a fixed number of moles of a gas confined at constant temperature the product of pressure and volume is constant
e) The gas laws only describe correctly gas behaviors for pure gases and not mixtures of gases

14) Which gas law when extrapolated indicates that there is a minimum low temperature that nothing can be colder than?
a) Boyle’s Law
b) The constant volume law
c) The combined gas law
d) Charles’ Law
e) Avagadro’s Law

Any Help will be appreciated.
Thanx.

2007-11-15 09:13:26 · 1 answers · asked by Anonymous in Chemistry

2007-11-15 09:11:13 · 3 answers · asked by Anonymous in Physics