Science & Mathematics - 3 December 2007

2007-12-03 10:53:52 · 3 answers · asked by Anonymous in Astronomy & Space

2007-12-03 10:53:25 · 13 answers · asked by Anonymous in Mathematics

Determine the force on -e (choose any -e in the diagram)
(the shape is square and the edges is 0.1m.)
+e----------(-e)
...l.................l
...l.<-0.1m->l
...l.................l
(-e)---------+e
thanks.p.s. dont mind the dots.

2007-12-03 10:49:47 · 1 answers · asked by Ross 1 in Physics

I can't understand how an observer in either a spherical, hyperbolic or flat universe will be able to tell the difference between the three. Surely if he was to measure the angles in a triangle in all three cases, the light would bend in accordance to the curvature of the universe and show that in each case, the angles in a triangle = 180.

I can understand how this works from an outside perspective of the universe, but not how insiders like this would be able to tell the difference

help!?

2007-12-03 10:48:15 · 3 answers · asked by Anonymous in Astronomy & Space

Physics homework... :(

2007-12-03 10:43:36 · 3 answers · asked by David F 1 in Physics

you push a 325-N trunk up a 20 degree inclined plane at a constant velocity by exerting a 211-N force parallel to the planes surface. What is the sum of all forces parallel to the planes surface?
Can someone explain how to solve this?

2007-12-03 10:42:43 · 1 answers · asked by Aitu4 3 in Physics

Co2 concentration
Light quantity
Temperature
Water

2007-12-03 10:42:13 · 2 answers · asked by V 1 in Biology

A 3.2-kg block is hanging from the end of vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass is 1.8 J. What is the elastic potential energy of the system when the 3.2-kg block is replaced by a 5.0-kg block?

2007-12-03 10:34:43 · 1 answers · asked by phyStudnt 1 in Physics

A careless driver rear-ends a car that is halted at a stop sign. Just before the impact, the driver slams on his brakes, locking the wheels. The driver of the struck car also has his foot on the brake pedal, locking his wheels. THe struck car has a mass of 900 kg, that of the initially moving car is 1200kg. On collision, the bumpers of the 2 cars stick together. The sliding cars leave marks 0.760m long. Tests show that the coefficient of kinetic friction btw tires and pavement is 0.920. What is the velocity of the moving car as he approached the intersection?

2007-12-03 10:33:26 · 2 answers · asked by Anonymous in Physics

http://www.theblackvault.com/wiki/index.php/Black_Eyed_Kids

2007-12-03 10:31:56 · 7 answers · asked by Deenie 6 in Paranormal Phenomena

I'm trying to replace a NiCD battery that has 24 sub-C batteries in it. I can directly connect any battery of similar voltage to the unit to power it, so I'm really just looking for a 28V DC battery that I can charge. Each sub-C battery has about 3000mA on it. Now, I know the voltage accumulates to give me approximately 28.8 volts when connected in sequence. Since I'm just looking for a comparable DC power source (again, just leads from the battery to the device), I don't know if I should be adding the amps of each battery to try to find a 28V DC battery at 72000mA. That sounds way excessive and not like something I'd be able to find. Which brings me to my next question: if amperage does get added up, would it be possible for me to just get a charger that would plug directly into the leads on the battery and charge it that way when necessary?

Thanks.

2007-12-03 10:28:06 · 1 answers · asked by bookofzero 1 in Other - Science

i do not understand how to tell the difference between sss, and sas congruence postulate and the other ones. How can you tell what a triangle is? I don't understandddd.

also, how do you do proofs?.

please helpp / contact mee aim- bhattisweetie2
thankss.

2007-12-03 10:27:40 · 3 answers · asked by bhattigirl23 2 in Mathematics

A long wire carrying a current of 1A runs along the x-axis & takes a circular detour in the x-y plane of a radius 5 cm. Whats is the magnitude & direction of the resultant magnetic field at a distance of 5 cm above the center of the circle?? someone please help...thanks in advance :)

2007-12-03 10:27:40 · 2 answers · asked by a.n. 1 in Physics

Bohr's ideas about electron orbits helped explain the regularity of atomic spectra but did not explain why the electron should orbit the nucleus only at certain distance. How did De Broglie's ideas of the dual nature of matter help explain the quantized orbits of electrons in atoms?

2007-12-03 10:26:43 · 1 answers · asked by David T 3 in Physics

"A bridge is to be constructed across a river that is 200 feet wide. The arch of the bridge is to be semielliptical and must be constructed so that a ship 40 feet wide and 30 feet high can pass safely through the arch with a horizontal clearance of 5 foot on each side. Find the equation for the arch and approximate the height of the arch in the middle of the bridge."

2007-12-03 10:25:52 · 1 answers · asked by Mr. R 2 in Mathematics

3x + y + 6 = 9

2007-12-03 10:25:50 · 7 answers · asked by pinaypie 1 in Mathematics

2007-12-03 10:20:13 · 8 answers · asked by HottOpink 1 in Mathematics

This is my math quesion..
'Calculate the area of a circle with each of these measurments'
a) The DIAMETRE is 7.3 cm.
b) The RADIUS is 2cm.
SO all i have to do is find the area of the cicle..,
could someone please give me the formulas?

2007-12-03 10:15:55 · 9 answers · asked by Anonymous in Mathematics

I'm in 8th grade, and I'm not entirely sure what an exponential relationship is. In class, we're doing exponential growth and decay, so we have to identify if a specific problem describes an exponential relationship.

Could you give me an example with this problem?:

1a. y = 100 * 3^x

So how can you identify an exponential relationship? Does it mean if the problem includes exponents?

Thanks!

2007-12-03 10:15:04 · 1 answers · asked by Cheaze 3 in Mathematics

how do i searh my home from NASA world wind

2007-12-03 10:14:56 · 1 answers · asked by maxime.ianniciello 1 in Astronomy & Space

2007-12-03 10:14:11 · 6 answers · asked by Anonymous in Astronomy & Space

at the end of meiosis II, each of the haploid sex cells has only half the number of chromosomes as the original diploid cell. why is this important?

2007-12-03 10:12:31 · 1 answers · asked by Anonymous in Botany

2007-12-03 10:09:11 · 4 answers · asked by Anonymous in Botany

Okay.. these are super simple but hard for me to concetrate at the same time .. please help..

What is the domain and range?

y = 25(-7x - 4)^(64)

y = (x^2)/(x^2-16)

y = 98(-6x - 5)^2

I think the answer for all of these is Domain = {all real numbers}, Range = {all real numbers}
Am I right... if not PLEASE explain

2007-12-03 10:07:01 · 3 answers · asked by Jaz 'ma' Taz 2 in Mathematics

On a small scale, calcium can be isolated through the retion of calcium chloride with sodium metal
CaCl2 + 2Na --> Ca + 2NaCl
Question:
how many moles of Ca are produced from 3.5 mol Na?

2007-12-03 10:06:58 · 4 answers · asked by Anonymous in Chemistry

Use the identities for (sin A + sin B) and (cos A + cos B) to prove that:

(sin2x + sin2y)/(cos2x + cos2y) = tan(x + y)

2007-12-03 10:06:34 · 2 answers · asked by Anonymous in Mathematics

Algebra 1 help...?
What is the range of the given relation?
[(2,2), (3,2), (2,3), (1,4)]
----------------------

I don't understand what the question is asking...I don't know what a relation is. I do know about x and y values, though. Thanks in advance!

2007-12-03 10:05:55 · 4 answers · asked by Lindsay 3 in Mathematics

1. Why does electromagnetis radiation in the ultraviolet region represent a larger energy transition than does radiation in the infrared region?
-I think it has something to do with the frequency or wavelenghts but i have no idea.

2. The wavelength of light is 310 nm. Calculate its frequency.
- I have no idea how to do this one

3. What is the wavelength of electromagnetic radiation if its frequency is 3.2 x 10 (-2) Hz?
- What??????

I'm so confused
Someone help me out?
Thanks if you can help
-j-

2007-12-03 10:05:37 · 1 answers · asked by jenni xo 3 in Chemistry

Pollution has a significant impact on the respiratory health of humans, how might it impact the respiratory health of organisms with different respiratory organs?

A comparison of the nutritional information for each sandwich. Suggested format: show the nutritional information in chart form followed by comments on the similarities and differences.

As part of a healthy diet, which sandwich would you choose and why?

What are the potential health risks of eating fast food in a regular basis?

2007-12-03 10:04:57 · 2 answers · asked by Linda k 1 in Biology

2007-12-03 10:04:37 · 1 answers · asked by regina3310 1 in Biology