Science & Mathematics - 7 September 2007

2007-09-07 09:41:12 · 4 answers · asked by nothingspecial 1 in Chemistry

i checked the psychoactives list in erowid and i fided there an chocolate vault! check for yourself if you don't belive me:
http://www.erowid.org/chemicals/chocolate/chocolate.shtml

2007-09-07 09:40:47 · 2 answers · asked by Anonymous in Chemistry

2007-09-07 09:37:23 · 14 answers · asked by ArmyWife 2 in Mathematics

2007-09-07 09:35:23 · 8 answers · asked by mistickle17 5 in Chemistry

2007-09-07 09:34:08 · 8 answers · asked by Anonymous in Physics

2007-09-07 09:32:28 · 2 answers · asked by Anonymous in Weather

2007-09-07 09:27:07 · 4 answers · asked by sincere12_26 4 in Chemistry

Even if and only "if" it was possible I think it would take years to the possibility of doing it....What are your thoughts...
serious answers please..

2007-09-07 09:25:12 · 15 answers · asked by calm x 1 in Physics

2007-09-07 09:23:51 · 6 answers · asked by mzsunshine262 1 in Geography

Yes, this is homework help. The question is as poses,

"What is the direction of the acceleration vector of a person on the spinning Earth if a person is (a) at the equator? (b) at some other latitude? (c) at the poles?"

2007-09-07 09:23:04 · 3 answers · asked by sugar_and_spice 2 in Physics

how can i solve it?

2007-09-07 09:22:51 · 3 answers · asked by shima 1 in Chemistry

Convert the following quantities. Be sure to show all work with units.

a) 285 cm to m

b) 0.85 kg to g

c) 42.2 in to cm (1 in=2.54 cm)


can you explain how to do these problems, not just the answers, im having trouble i dont really know how to do this, thanks

2007-09-07 09:22:50 · 3 answers · asked by Anonymous in Physics

if you know that sin x = ±1/√2 how do you find out what x is?

2007-09-07 09:19:24 · 4 answers · asked by fhsdjfsd 2 in Mathematics

2007-09-07 09:18:52 · 4 answers · asked by Wanda S 4 in Physics

2007-09-07 09:18:39 · 8 answers · asked by Slim24/7 5 in Mathematics

How is mountain water turned into clean, safe, drinking water?

2007-09-07 09:16:02 · 2 answers · asked by Steve W 1 in Chemistry

2007-09-07 09:12:03 · 4 answers · asked by Warfighter 2 in Mathematics

I am very lost with this question can someone please help me.:) and please explain what u do in detail because i have no idea what to do. thanks please take ur time and make sure it is correct thanks

Two students walk in the same direction along a straight path, at a constant speed-one at 0.90m/s and the other at 1.90m/s.

a. Assuming that they start at the same point and the same time, how much sooner does the faster student arrive at a destination 780m away???

b. How far would the students have to walk so that the faster student arrives 5.50min before the slower student ???

2007-09-07 09:10:49 · 6 answers · asked by bubblebee 2 in Physics

I know the largest nuclear bomb ever exploded was the Tzar Bomba, that I believe was 50 megatons and could create 100 square miles or more of complete or near complete destruction. But lets say now, the USA or other superpower tried to create real strong nuke, theoritically, how strong could they make it, and how much destruction could it cause? Like for example, how large would the blast be?

I'm thinking we could make a much stronger bomb than Tzar Bomba, since it was made 50 years ago, and we must be more advanced now.

2007-09-07 09:05:11 · 6 answers · asked by THE HAMSTER 1 in Physics

I know this sounds crazy. But I am having the procedure done at 11 and I have to be at a very important dinner at 6. Will I be able to go?

2007-09-07 09:01:34 · 10 answers · asked by JJ 2 in Medicine

2007-09-07 09:00:40 · 4 answers · asked by Macgyver with Crosby 4 in Earth Sciences & Geology

A 1/4 -mile track for racing stock cars consists
of two semicircles connected by parallel straightaways (see
the figure). In order to provide sufficient room for pit crews,
emergency vehicles, and spectator parking, the track must enclose an area of 100,000 square feet. Find the length of the
straightaways and the diameter of the semicircles to the nearest foot. Recall: The area A and circumference C of a circle of diameter d are given by A= pie times diameter squared divided by 4 and c= pie times diameter.


i do not know how to get it into an equation although i have been shown some suggestions and even once into the equation i do no know how to solve... can someone please fully help me...

i do not know how to work problems with the substitution method, if someone would be so kind to work it out maybe i can see and learn... I am a visual learner

here is the diagram
http://i7.photobucket.com/albums/y294/joetta/cart.jpg

2007-09-07 08:59:10 · 2 answers · asked by joetterb 3 in Mathematics

Seemed simple enough, but I'm getting a really big number:

"The noise produced by a resistor is to be amplified by a noiseless amplifier having a voltage gain of 75 and a bandwidth of 100kHz. A sensitive meter at the output reads 240 uV rms. Assuming operation at 37 C, calculate the resistor's resistance."

So I used this equation: en (noise voltage) = sqrt ( 4kT * delta f*R)

Using that, I had:
240 x 10^-6 = sqrt ( 4 * 310 K * (1.38 x 10^-23 J/K)*(100 x 10^3)*R)

When I solved for R, I got an answer of 3.3661 x 10^7 ohms, which is wayyy more than the given answer of 5.985k ohms. Does anyone know what I did wrong? Thanks!

2007-09-07 08:58:57 · 2 answers · asked by Galbadian 2 in Engineering

I wonder how many people could fit into a 100-mile-wide asteroid?

2007-09-07 08:51:48 · 13 answers · asked by Bill W 【ツ】 6 in Astronomy & Space

i have 2 problems and both of them is function which i am not good in so i need your help and plzzz write every step of how to do and how we get the right answer.
question nr. 1: given f(x)= 4x^2/(2+3x^2)
determine the domain of f(x).
determine the signs of f(x).
determine the asymptotes, if any.
Draw the graph for f(x).

question nr.2: given f(x)=x^2-x-2/ x-1
determine the domain of f(x).
determine the signs of f(x).
determine the asymptotes, if any.
draw the graph for f(x).

please help me and if you want to have my email so i can write my email to you guys so you can send me because i dont have the programe for math which is called ( mathcad) so i can not draw any graph. please help me i really need help.
plz write your answers step by step how to find out and how to draw the graph.
thank you

2007-09-07 08:50:46 · 2 answers · asked by nice_ girl 1 in Mathematics

Can weather really make you feel bad, like if it's raining and you're inside all day, will the rain outside really cause a change in your mood/healthiness? I would think not, but I don't know, science/medicine can be strange sometimes.

2007-09-07 08:48:48 · 3 answers · asked by ? 3 in Medicine

How much of a 30% alcohol solution must be mixed with 8 liters of a 45% solution in order to get a mixture which is 42% alcohol. PLEASE explain, i don't know how to solve it.

2007-09-07 08:48:07 · 3 answers · asked by Anonymous in Mathematics

I have this project and I cant find any websites that tell me how I can make an animal cell in 3D. Im really looking for a project that uses simple stuff like everyday things. if possible does anyone know a way that I can make it with styrofoam?

2007-09-07 08:38:34 · 5 answers · asked by pr_chick_77 1 in Biology

2007-09-07 08:37:40 · 4 answers · asked by Anonymous in Mathematics

I seem to be hitting a wall with difference quotient problems. For this one I have f(x) = x - 1, find f(x+h)

f(x+h) = (x + h) - 1?
I'm not exactly sure if that's how the h should be applied or if f(x+h)= x+ h -1

2007-09-07 08:34:48 · 4 answers · asked by Rogers Hammers 1 in Mathematics