Science & Mathematics - 21 October 2007

2007-10-21 02:26:22 · 6 answers · asked by ravi 2 in Chemistry

what do they do to be dangerous?

2007-10-21 02:25:21 · 20 answers · asked by @NGEL B@BY 7 in Zoology

2007-10-21 02:24:50 · 2 answers · asked by ian 1 in Physics

i just need a basic answer

2007-10-21 02:23:02 · 3 answers · asked by pebbles. 3 in Mathematics

and how good is their behavior?

2007-10-21 02:22:54 · 15 answers · asked by @NGEL B@BY 7 in Zoology

According to my friend, as the frequencys of 2 connected systems come closer together, the amplitude of their osccilations would tend to infinity. We tried to come up with a real example -

If I stood on the end of a diving board and bounced up and down, then at the same time swung around a brick on a piece of rope, in such a way that the oscilations of each system matched, would I theoretically be flung into space?

2007-10-21 02:15:13 · 4 answers · asked by none 2 in Physics

Give as many reasons as you can. ;D

2007-10-21 02:06:54 · 3 answers · asked by elvesrattackingme 2 in Physics

2007-10-21 02:03:25 · 2 answers · asked by marie 3 in Astronomy & Space

another dimension? would the spaceship turn into spaghetti? any thoughts?

2007-10-21 01:59:32 · 17 answers · asked by Anonymous in Astronomy & Space

I'm in the 8th grade
i have to do a prject about crude oil
and see how much is cost
how is it good
and how is it bad
i did all of that except how much does it cost

2007-10-21 01:56:16 · 7 answers · asked by Anonymous in Engineering

i remember reading somewhere that it was impossible for hmans to build a device that could travel at the speed of light but i cant remember why. can anyone please explain?

2007-10-21 01:55:18 · 7 answers · asked by Anonymous in Physics

In Oscilloscopes .

2007-10-21 01:52:44 · 1 answers · asked by Naaraayanan 3 in Engineering

2007-10-21 01:52:12 · 16 answers · asked by Anonymous in Biology

Dy/dx + xy = xy2 when x=0, y=2

(1-x2)*Dy/dx – xy = xy2

(Dy/dx)^2 = (x+1)/(x+2)2

Ln (Dy/dx) = x+y; when x=0, y=0

2007-10-21 01:45:49 · 4 answers · asked by Sajith R 1 in Mathematics

Hey, i don't get either of these questions, if someone could help me I'd really appreciate it!

[this ones a pulley system problem...]
The weight of a block on a table is 422N and the weight of the block hanging is 185N. Ignoring all frictional effects and assuming the pulley to be massless, find
a) the acceleration of the two blocks
b) the tension in the cord

A 95kg person stands on a scale in an elevator
What is the apparent weight when the elevator is
a) accelerating upward with an acceleration of 1.8 m/s^2
b) moving upward at a constant speed
c) accelerating downward with an acceleration of 1.3m/s^2

thanks!

2007-10-21 01:44:07 · 3 answers · asked by Melissa S 1 in Physics

If the telescope was directed at earth and an alien was looking through it does that mean they would be watching the earth 500 years ago? as in if the telescope was so good that it could actually see things happening on the ground and people walking around would they see knights in shining armour and castles and horses etc?

2007-10-21 01:41:43 · 11 answers · asked by Anonymous in Astronomy & Space

Whether it is good or bad one please give your reasons........please.

2007-10-21 01:07:32 · 6 answers · asked by Robin 1 in Medicine

2007-10-21 00:57:36 · 5 answers · asked by Anonymous in Biology

(d^2y/dx^2) + 7(dy/dx) +12y=0,
y(0)=1,
dy/dx(0)=3.

Find lim(x->infinity) y(x)

2007-10-21 00:56:09 · 4 answers · asked by Anonymous in Mathematics

1. 15:5
2. 14:6
3.14:5
4.16:5
5. 16:4
6. 15:4
7. 14:4
8. 15:6
9 16.6

I chose answer #1, but obviously its wrong. I need your help, btw how did you come up with your answer (ty).

2007-10-21 00:55:03 · 2 answers · asked by xxxladyxxx 1 in Chemistry

In my quest to better understand trigonometry, It would be cool for someone to manually (dont use a calculator) calculate cos(256) and show me how they did it, include every step :)

Don't explain to me what cos does, just work it out and show me every step, I'll try to figure it out on my own.

Thanks

2007-10-21 00:54:49 · 5 answers · asked by Anonymous in Mathematics

2007-10-21 00:53:29 · 7 answers · asked by temerson 4 in Earth Sciences & Geology

if we climb the stairs steps 2 at a time then there will be 1 step remaining ,,, if we climb 3 steps at a time then there will be 2 steps left , if we climb 4 steps at a time then there will be 3 steps left , if we climb 5 steps at a time then there will be 4 steps left , if we climb 6 steps at a time then there will be 5 steps left ,, if we climb 7 steps at a time no steps are left ,,,ok the question is what is the total number of steps and write me the equation or how did u figure it out ,,,, hint ,,, the number of stair steps is 119 ,,, just tell me how u got it ?? pls write the equation ,,,, thank u

2007-10-21 00:49:51 · 2 answers · asked by k k 72 2 in Mathematics

2007-10-21 00:44:03 · 3 answers · asked by Anonymous in Engineering

2007-10-21 00:13:15 · 6 answers · asked by Anonymous in Geography

Find the solution y(x) to the initial value problem

(d^2y/dx^2) + 7(dy/dx) +12y=0,
y(0)=1,
dy/dx(0)=3.

Find lim(x->infinity) y(x)

2007-10-21 00:12:02 · 1 answers · asked by Anonymous in Mathematics

what is the set of relation of xy=6 if the set of answers are all integers?

2007-10-21 00:08:57 · 3 answers · asked by austere 1 in Mathematics

how do u expand the equation: (x+1)(x-1)(x-3)?

2007-10-21 00:08:20 · 3 answers · asked by Anonymous in Mathematics