Science & Mathematics - 3 December 2007

2(du/dt) = u^2 u( 0)= 1

Please give a step by step, I know that i am close to the right answer, i'm just missing a step thats throwing my answer off

2007-12-03 18:09:32 · 4 answers · asked by Anonymous in Mathematics

2(x + 6) = 3(2 - x) - 4

2007-12-03 18:06:31 · 22 answers · asked by stinger98837 1 in Mathematics

A dense plastic toy of mass 3 kg is floating just beneath the surface of a pond. What is the buoyant force on it?

Approximately 30 N right?

2007-12-03 17:54:36 · 3 answers · asked by Physics_Hard_YES 1 in Physics

2007-12-03 17:50:24 · 1 answers · asked by Anonymous in Chemistry

I am doing this assignment and am stuck on this question. Any help would be much appreciated!

Q- Considering that low pressure and high pressure zones give us different weather patterns, compare their air flow directions at ground level and aloft and explain how this flow contributes to the weather pattern.

2007-12-03 17:45:21 · 3 answers · asked by Anonymous in Weather

A small block of mass 0.09 kg is placed against a compressed spring at the bottom of a frictionless track that slopes upward at an angle of 40 degrees above the horizontal. The spring has k = 640 N/m and negligible mass. When the spring is released, the block travels a max distance of 1.8 m along the track before sliding back down. Before reaching this max distance, the block loses contact with the spring. (a) what distance was the spring originally compressed? (b) When the block has traveled along the track 0.8 m from its initial position against the compressed spring, is it still in contact with the spring? What is the kinetic energy of the block at this point?

2007-12-03 17:44:13 · 2 answers · asked by Heather P 1 in Physics

What kind of world do you want to leave your children? I mean it in the environmental sense not politically. I'm curios.

2007-12-03 17:38:21 · 1 answers · asked by Krystal 2 in Earth Sciences & Geology

2007-12-03 17:37:47 · 3 answers · asked by william s 1 in Medicine

2007-12-03 17:34:37 · 8 answers · asked by Anonymous in Mathematics

Is it about the 21st century?
Black jack's 21?
21 gun salute?
21 years old for male's debut?
And the latest... 21 meateors hitting Jupiter?
What is so amazing about 21?
Any history background regarding 21?
There must be some signifance about 21?

2007-12-03 17:19:15 · 6 answers · asked by wacky_racer 5 in Astronomy & Space

the choices are:
1. -1
2. 5
3. 4+ 3i
4. 2- 6i
5. 2+ 3i

2007-12-03 17:18:34 · 7 answers · asked by PrestigesGlow 1 in Mathematics

For all problems let s=<-3,1>, u=<4,2>, v=<1,-2>, w=<-2,5>

(a) u * v

(b) (2w) * u

(c) v * (w - s)

2007-12-03 17:15:27 · 2 answers · asked by Anonymous in Mathematics

Changing fractions to decimals.... How is the answer 0.8 gotten from 4/5? This thing I am looking at says divide the numerator by denominator. So, 4 divided by 5 is 0.8 on the calculator. But where does the 8 come from? I need to know how to do it without a calculator. I need it explained in detail.

2007-12-03 17:07:36 · 16 answers · asked by Deb 2 in Mathematics

Ghost has left the wine cellar....(he is one happy casper, by the way) He wants my shoes! Not just the ones I have on but ALL of my shoes! What to do!

Question is not serious - just in the "spirit" of fun.

Hopefully, no whiny baby will go to yahoo and ask for its removal.

2007-12-03 17:07:10 · 13 answers · asked by Anonymous in Paranormal Phenomena

2007-12-03 17:04:38 · 6 answers · asked by PrestigesGlow 1 in Mathematics

A 15.0 m, 508 N uniform ladder rests against a frictionless wall, making an angle of 60.0° with the horizontal.
(a) Find the horizontal and vertical forces exerted on the base of the ladder by the Earth when an 814 N fire fighter is 4.00 m from the bottom. horizontal N 271.97N
vertical N 1322N
(b) If the ladder is just on the verge of slipping when the fire fighter is 9.00 m up, what is the coefficient of static friction between ladder and ground?

CAn someone give me a clue how to do part b? I calculated part a and I needed help on b! Thanks

2007-12-03 17:00:50 · 1 answers · asked by Anonymous in Physics

From fossils if any, for example?

2007-12-03 16:58:12 · 4 answers · asked by Anonymous in Zoology

2007-12-03 16:57:53 · 4 answers · asked by Anonymous in Earth Sciences & Geology

The oceans contain a tremendous amount of thermal (internal) energy. Why, in general, is it not possible to put this energy to work?

This is a Physics concept question and I have no idea.

2007-12-03 16:52:11 · 1 answers · asked by Dot 1 in Physics

1/e - 1/f = 1/g solve for f incase you cannot tell, these are in fraction form

2007-12-03 16:51:58 · 10 answers · asked by Anonymous in Mathematics

2007-12-03 16:51:42 · 3 answers · asked by Mane Z 1 in Mathematics

what is 75,000,000

2007-12-03 16:47:19 · 4 answers · asked by Anonymous in Mathematics

Yea what ^ that said.

2007-12-03 16:46:38 · 1 answers · asked by Jey A 1 in Biology

Its a logarithmic equation and im having a little trouble.

2007-12-03 16:38:30 · 3 answers · asked by afromaster32 2 in Mathematics

find x

2007-12-03 16:37:49 · 5 answers · asked by Small Victories 4 in Mathematics

2007-12-03 16:35:14 · 8 answers · asked by dr.whooo 2 in Mathematics

a 615kg racing car completes one lap in 14.3 s around a circular track with a radius of 50.0 m. The car moves at a constant speed. What is the Acceleration of the car? What force must the track exert on the tires to produce this acceleration? write the equation you use for it too....

2007-12-03 16:34:41 · 2 answers · asked by Anonymous in Physics

I need to get log5(20) into1+log5(4) how would i do that?

2007-12-03 16:33:22 · 3 answers · asked by michelle 1 in Mathematics

Okay, we know that there really is no way right now, that we can know if there are other civilizations out there somewhere. But! Do you think that it is possible that sometime in the near future, we could intercept some of their frequencies? Some say this has already been done and is top secrete classified information. I have no idea. I figure that could be a matter of opinion. But to me, it does seem very possible! Am I wrong? Since there are so many stars and galaxies out there, I am certain that there has to be another planet similar to ours. Whether there are civilizations, dinosaurs, or other animals on those planets of course remains a mystery. I am fascinated by this though. Its quite interesting.

2007-12-03 16:31:53 · 16 answers · asked by Anonymous in Astronomy & Space

here's an example: 3t ≤ 15

I kind of know how to do it but I just want to be correct.!

2007-12-03 16:29:30 · 2 answers · asked by Anonymous in Mathematics