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Science & Mathematics - 4 February 2007

[Selected]: All categories Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

First one to answer both answers CORRECTLY GETS TWO POINTS: Why surface winds are generally very weak near the equator?

2007-02-04 21:54:12 · 5 answers · asked by Anonymous in Earth Sciences & Geology

avoid a black hole, bearing in mind that its invisible how could a space ship avoid it ,when they direct the ship can they see it through a telescope on the ground ?

2007-02-04 21:52:19 · 5 answers · asked by mario 3 in Astronomy & Space

explain pls...

2007-02-04 21:48:20 · 6 answers · asked by Anonymous in Chemistry

Any formulas for calculating the rate of heat loss; and any experience of observing thermographic images in a like case welcome.

Assume that in index finger at body temperature is used.

2007-02-04 21:47:21 · 2 answers · asked by Deckard 1 in Physics

2007-02-04 21:39:21 · 4 answers · asked by Alyosha 4 in Astronomy & Space

I don't know what story this idea comes from - when I was a kid we somehow had the idea that cut up tiger hairs were sharp like glass and could be used for assassinations! Ring any bells?

2007-02-04 21:38:30 · 11 answers · asked by Alyosha 4 in Other - Science

plz explain with examples

2007-02-04 21:36:13 · 16 answers · asked by Anonymous in Chemistry

I want to make a mini jet engine to put on a R/C car but i only want to have the blades compress the air. So no fuel is actually injected into the model. Will the engine work with only the pressure of the blades of the blades or do i need to inject fuel and ignite it?
I plan to power the blades with a 12 volt slot car motor.

2007-02-04 21:30:06 · 6 answers · asked by nerd608 1 in Engineering

abc of radioactivity

2007-02-04 21:29:18 · 8 answers · asked by Oladipo T 1 in Chemistry

Something like T_ij . A_i ? Or is the result change when tensor would be contravariant or mixed?

2007-02-04 21:27:44 · 1 answers · asked by Anonymous in Mathematics

let a=b
a^2=ab
a^2-b^2=ab-b^2
(a-b)(a+b)=b(a-b)
a+b=b
a+a=a
2a=a
2=1
why???????Is there any theory that i used is wrong.if it is correct,then is it 2 can also be equal to 1 in actual mathematics rules??

2007-02-04 21:24:51 · 5 answers · asked by Teh Y 1 in Mathematics

1

Find the area enclosed by graph y=e^-x, the x axis and the y axis

2007-02-04 21:22:49 · 3 answers · asked by Anonymous in Mathematics

Hey to all, i need help with the the following 3 questions please?

Quesion 4) What vector subtracted from 100km N gives 200km N60E?

Question 8)
a) i solved the answer is 25N

b) what is the direction of the nest force acting on the mass?

Question 11) A cyclist rides along a straight road for 2.7km in a diection N23E and then 4.3km along another straight road S46E. What is he resultant displacement?

Question 12) An airplane files 420km in a northerly direction and then 350km in direction 50(degrees) west of north. how far is the airplance from its starting position and what is its direction?

THANKS HEAPS FOR ALL THAT HELP...

2007-02-04 21:16:15 · 1 answers · asked by NFLS121a 1 in Physics

2007-02-04 21:08:37 · 1 answers · asked by Alain B 1 in Botany

2007-02-04 21:01:34 · 1 answers · asked by george m 1 in Biology

There are two trains, arriving between 8 to 8:20. First train hault for 3 min. and second halt for 4 min.
What is the probablity that second train will arrive before first train?

2007-02-04 20:55:28 · 4 answers · asked by SAM 1 in Mathematics

a .050kg tennis ball approaches a rocket at 25m/s. if it is in contact with the rocket strings for 0.005s then rebounds at 25m/s. what is the average contact force between the ball and rocket?

2007-02-04 20:55:10 · 1 answers · asked by antoinekingx 1 in Physics

2007-02-04 20:53:54 · 3 answers · asked by esther song 1 in Zoology

2007-02-04 20:52:15 · 3 answers · asked by Anonymous in Mathematics

2007-02-04 20:48:20 · 6 answers · asked by hyaki ikari 2 in Earth Sciences & Geology

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