Science & Mathematics - 20 December 2006

To how many significant figures must you determine the percentage of carbon in a drug sample to distinguish cocaine (C17H21O4N) from aspirin (C9H8O4)?

2006-12-20 04:38:36 · 4 answers · asked by Anonymous in Chemistry

If you believe all that stuff is some elaborate hoax, then the pictures of the round earth from space would have to be faked, and thus there is no proof the earth is round, and thus you would logically believe the earth was flat and if you sailed long enough you would fall off the edge, right?

2006-12-20 04:38:09 · 15 answers · asked by Anonymous in Astronomy & Space

2006-12-20 04:38:02 · 1 answers · asked by Anonymous in Engineering

2006-12-20 04:37:11 · 10 answers · asked by Angad 4 in Mathematics

There is a ray of light falling on a plane mirror. When the mirror is turned through 5º, the reflected ray is found to have moved by 10º.
Why does that happen?

2006-12-20 04:36:53 · 3 answers · asked by heyheyhey 2 in Physics

1. currents circulate in a piece of metal that is pulled through a magnetic field what are they called? (is it the solonoid??)

2. A c.r.o (cathode ray osc.) is set to 5V/cm. if height of wave from peak to peak is 5cm. what is V peak and V r.m.s (root means squared)

3. what is a flux linkage?

4. an A.C power outlet is labelled 240V what is Vpeak and Vr.m.s

5. an oscilloscope has a grid of 10div x 10 div. if time base is set at 3ms/div, how many times does the beam scan the screen per minute? what is the frequency?


thnx!!!

2006-12-20 04:33:42 · 3 answers · asked by ox_monzy_xo 2 in Physics

2006-12-20 04:33:16 · 7 answers · asked by Anonymous in Geography

Invisibility? Suits with two-way camera-monitors are already being tested.

Being in two places at the same time? Particle duality is now a fact.

How would science achieve...

Immortality?

Interstellar travel?

Time travel?

Reencarnation?

Long-distance Wireless energy transmission?

Or any you'd like to share.

2006-12-20 04:32:24 · 8 answers · asked by Исаак Озимов 3 in Other - Science

I can produce the .eps file but when i try to open it, it just becomes FILE, something i cannot open......

2006-12-20 04:32:24 · 3 answers · asked by RobLough 3 in Physics

2006-12-20 04:31:24 · 5 answers · asked by bigm789 2 in Weather

2006-12-20 04:29:45 · 1 answers · asked by danny 1 in Engineering

2006-12-20 04:27:12 · 18 answers · asked by 3naz 1 in Mathematics

2006-12-20 04:25:54 · 19 answers · asked by Anonymous in Chemistry

TRUE OR FALSE

1. If a magnet and a wire are moving at 5m/s to the right then there will be an induced current.

2.If a conducting rod is moved perpendicular to the field lines of a magnet a current will be induced.

3.When the flux through a loop changes a current is induced.

4.The induced e.m.f (electromotive force) tends to oppose the flux causing it.

2006-12-20 04:25:41 · 4 answers · asked by ox_monzy_xo 2 in Physics

2006-12-20 04:25:36 · 12 answers · asked by curlyhead thebarber 1 in Astronomy & Space

Could anyone help explain the process to answer the following step by step pls.

(0.49*10^-6)^-1/2

AND

(1/25)^(-3/2)

2006-12-20 04:25:36 · 7 answers · asked by SHIBZ 2 in Mathematics

In response to my earlier question about evolution and global warming, I read answers that both are theories. My question is, what is a theory? Is it not what does not have evidence/ proof yet, but can be tested? In that regard, Evolution simply CANNOT be a theory, since it has proof enough that it exists and happens. Creationism or the existence of God's design can be a "theory" at best. Global warming also to the best of my knowledge has become a "fact" rather than a theory, looking at the melting of the ice caps in the polar regions. Or does we need actual changes from a monkey population to a human population for evolution to be deemed a fact? Then again people will call it a "Miracle" of creation!

2006-12-20 04:25:16 · 10 answers · asked by AniC 1 in Earth Sciences & Geology

this dont seem right it aint suppose to 35 degerees in san diego when you can see your breath in the house it's to could

2006-12-20 04:20:13 · 8 answers · asked by Anonymous in Weather

I am leaving in less than a month to study abroad in South Africa. I have heard that on occasion lions wander into the city where I will live. If I should see a lion wandering about, does anyone know what to do? Especially if it should walk up to me?

Thank you!

2006-12-20 04:19:00 · 6 answers · asked by Jennifer B 3 in Zoology

2006-12-20 04:18:04 · 14 answers · asked by Kaya 1 in Weather

2006-12-20 04:17:23 · 16 answers · asked by Alyosha 4 in Astronomy & Space

if a^2 is divisible by 7 then a is divisble by 7 to

2006-12-20 04:15:50 · 2 answers · asked by Angad 4 in Mathematics

Hehehe muhahaha no one can do this muhahahahaha

2006-12-20 04:15:14 · 8 answers · asked by Anonymous in Astronomy & Space

I'm a well educated person, but I just don't fully understand the exact inner workings of animal cells. Don't put it in lamen's terms, I want to know all about it.

2006-12-20 04:11:40 · 1 answers · asked by Syreus 2 in Chemistry

2006-12-20 04:09:17 · 2 answers · asked by Michelle 6 in Weather

okay , i understand how to do it and i have my own way of figuring it out ,but how do i properly write it down?
examples-

+2 + -9=

i write it out like so=

9-2=7
then add the minus symbol because 9 is the larger number in the equation so it's

9-2= -7

but the correct way to write it is like so?

+2 + -9=

2-9= -7 ???

is this the proper way to write it out?

2006-12-20 04:08:58 · 10 answers · asked by Anonymous in Mathematics

Include the significance of this phenomenon in relationship to diffraction.

2006-12-20 04:06:44 · 2 answers · asked by Amanda 2 in Physics

An object leaves earth, attains light speed, also being observed from earth. It then switches two lights 'on' one forward the other aft. Light will/should leave from these two points at the speed of light? Now the question.
1) Will light at the forward end leave at the speed of light relative to the craft and from earth appear to exceed the speed of light?
2) Light leaving at the aft end of the craft will leave at the speed of light relative to the craft but since the craft is already traveling at the speed of light in the opposite direction, will light appear on earth as stopped?
If we have to accept that everything is relative. Then light in question 1, will travel faster than the speed of light, relative to earth where the object emitting light left from. Light leaving the craft (aft) can never be seen since it will never reach earth owing to its source receeding at the speed of light.
How do we know the universe is expanding if it does so at light speed, another question?

2006-12-20 04:03:51 · 24 answers · asked by tmd5855 1 in Physics

2006-12-20 04:02:57 · 4 answers · asked by vikky 1 in Physics

I forgot, say on a square which side is length and which side is width.

2006-12-20 04:02:16 · 8 answers · asked by James A 1 in Mathematics