Science & Mathematics - 11 December 2007

Please help, I am doing my own homework. It's just that one question that I can't seem to find the answer to.

Also
is only possible use of spectral analysis to be able to distinguish elements from one another?

2007-12-11 09:37:02 · 2 answers · asked by * citizen . erased * 5 in Chemistry

2007-12-11 09:36:26 · 4 answers · asked by Christina M 1 in Biology

Well I am making a container that will portect an egg that is dropping a 5 meter drop. No packaging materials like bubble wrap, styrofoam and peanuts etc...
No parachutes.

2007-12-11 09:35:51 · 5 answers · asked by Anonymous in Engineering

2007-12-11 09:32:42 · 4 answers · asked by Anonymous in Botany

One end of a uniform 4.0 m long rod of weight w is supported by a cable. The other end rests against the wall, where it is held by friction (see Fig. P8.24). The coefficient of static friction between the wall and the rod is µs = 0.50. (The wire makes an angle of 37° with the rod.) Determine the minimum distance, x, from point A at which an additional weight w (same as the weight of the rod) can be hung without causing the rod to slip at point A.

The figure can be found at http://www.webassign.net/sf5/p8_24.gif.

Looking at the figure first makes it easier i think. I'm kinda stuck. I have no idea what to do at all. Any help would be great. I feel like I have too many variables and not enough equations or something. help? Please? Thanks to anyone who takes the time to help me out. :)

2007-12-11 09:32:38 · 1 answers · asked by Anonymous in Physics

If YOU WERE TO DRAW 3 LINES RANDOMLY, WOULD THEY FORM A TRIANGLE?

2007-12-11 09:32:35 · 6 answers · asked by School Freak 2 in Mathematics

For example, in DNA, would the C-G bonds take longer to break down than the A-T bonds, since the C-G have 3 hydrogen bonds each and the A-T only have 2. Thanks!

2007-12-11 09:30:37 · 2 answers · asked by ¿ /\/ 馬 ? 7 in Chemistry

2007-12-11 09:27:42 · 7 answers · asked by Anonymous in Paranormal Phenomena

Winter weather advisory remains in effect until 7 am est wednesday, A winter weather advisory remains in effect until 7 am est wednesday. Snow will change to sleet and then freezing rain this evening across the extreme southwest coast of maine and over southern new hampshire. An inch or less snowfall will accumulate before the changeover. Rain will mix in along the immediate southwest coast of maine and seacoast of new hampshire. Please report snow or ice accumulations to the national weather service by calling toll free at 1-877-633-6772. Stay tuned to noaa weather radio, your local media, or go to www.weather.gov/gray for further updates on this weather situation.

2007-12-11 09:27:29 · 7 answers · asked by booieh 1 in Weather

The balanced equation is

2C4H10 + 13O2 --> 8CO2 + 10H2O

What are the molar ratios for:

a) C4H10 / O2

b) O2 / CO2

2007-12-11 09:27:14 · 2 answers · asked by Anonymous in Chemistry

Find the perimeter of the triangle shown in the figure.

Note: The triangle shows the following numbers on each side...
top-4; left-square root 5(negative sign in the middle) and sqare root 3...right-square root 5(positive sign in the middle) and square root 3...PLEASE HELP!

2007-12-11 09:24:00 · 1 answers · asked by God Bless America!~ 4 in Mathematics

I think it was sodium hydroxide (NaOH) and I got some on a cut. I washed it out with soap and cold water like my teacher told me to. It's now like 3 hours after the fact and it still hurts. Is this bad or is it completely normal after something like this happened?

2007-12-11 09:22:15 · 5 answers · asked by B 5 in Chemistry

well, i am taking AP-calculus this year and now i am on the application of minimum and maximum. the stupid thing i cant understand is the (volume) and the (surface area) , i dont know what is the difference between them

I.E: the volume of a rectangular solid .....

2007-12-11 09:22:00 · 6 answers · asked by Anonymous in Mathematics

Solve each inequality. Check your solution
1) 2x < 8
2) 3x > -6
3) -4t > -20
4) a/5 > 10
5) -8 > k/-0.4
6) m/-7 < 1.2
7) -s/3 < -3.5
8)36 > -1/2y
9)-273 > -13z

2007-12-11 09:21:49 · 4 answers · asked by haaaaahaaaa! 1 in Mathematics

A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 6.0 J of work is required to compress the spring by 0.12 m. If the mass is released from rest with the spring compressed, it experiences a maximum acceleration of 20 m/s2.

1. Find the value of the spring constant.

2. Find the value of the mass.

All work would be greatly appreciated. Thank you =).

2007-12-11 09:19:45 · 3 answers · asked by Anonymous in Physics

i think it is sooooooo romantic don't you think

2007-12-11 09:17:44 · 11 answers · asked by Anonymous in Weather

If a certain sample of an ideal gas has a temperature of 104 degrees C and exerts a pressure of 2.3 x 10^4 Pa on the walls of it's container, how many gas molecules are present in each cm^3 of volume? assume that the gas is ideal. The gas constant is R=8.314 J/mol K and avagadro's number is NA=6.022 x 10^23 molecules/mol

???

2007-12-11 09:17:14 · 6 answers · asked by Statia B 1 in Physics

Solve each equation. Check your solution
1) 3(a-5)=18
2) 32=4(x+9)
3) 2(d+6)=3d-1
4) 6(n-3)=4(n+2.1)
5) 12-h=-h+3
6) 3(2g+4)=6(g+2)

2007-12-11 09:17:00 · 4 answers · asked by haaaaahaaaa! 1 in Mathematics

If set A= {2,4,6,7} B= {3,5,7,8} C= {2,5,6,7}

Find (A union C)intersection B

Please help. thank you so much.

2007-12-11 09:14:59 · 8 answers · asked by Earl 1 in Mathematics

I am confused with this HW assignment:

The entropy of a system is found by placing a sign -in front of sign Σ in front of products of thingies P_i and their logarithms. Using letter S for entropy and denoting logarithms by ln() write an expression for the entropy of the system.

I figured out that the beginnig should look like
S = -Σ
but logarithms took me completely off guard. What are those logarithms things anyway.

I need to know, because I am finishing my MS in physics and plan to develop tubines for airplane engines.

2007-12-11 09:13:45 · 4 answers · asked by Alexander 6 in Physics

2007-12-11 09:13:32 · 1 answers · asked by sweet113509 1 in Chemistry

a line with slope 3, intersects a line with a slope 5 at the point (10,15). what is the distance between the x-intercepts of these two lines?
please show work, of how to arrive at answer
thanks in advance for your help! ~USA~

2007-12-11 09:13:29 · 4 answers · asked by ~USA~ 2 in Mathematics

A. Absorption
B. Conduction
C. Albedo
D. Scattering

2007-12-11 09:08:44 · 3 answers · asked by Aditya G 1 in Astronomy & Space

The biological weapon-type monsters? You know, like the monsters in the Resident Evil games. Not exactly the zombies, I mean the monster monsters. Like the hunter, and all those type of things. (If you play RE, you should know what a hunter is). Do you think monsters like that can exist someday if created by man? I can see it happening someday, quite possibly even has already happened, only kept quiet by the government and all them.

2007-12-11 09:07:33 · 2 answers · asked by Suuuup!! 1 in Biology

3x=9
3x-5=7-x

the x is not a multiplication sign

2007-12-11 09:06:34 · 11 answers · asked by Sarah 1 in Mathematics

2007-12-11 09:05:47 · 6 answers · asked by Anonymous in Biology

Is there different grades of this?

2007-12-11 09:03:14 · 2 answers · asked by Anonymous in Chemistry

The perimeter of a rectangular rug is 120 feet. Its width is 24 feet. What is the distance between the two corners of the rug that do not share a common side? Show your work.

2007-12-11 09:03:10 · 1 answers · asked by Anonymous in Mathematics

2007-12-11 09:02:04 · 17 answers · asked by Anonymous in Biology

i tend to get confused with anything more complicated! Thanks!

2007-12-11 08:59:49 · 3 answers · asked by kate 1 in Mathematics