Science & Mathematics - 30 June 2007

where can I find the proof of the derivative of cos x = - sin x

2007-06-30 23:45:18 · 8 answers · asked by during 1 in Mathematics

and can i take astronomical photos through binocular eyepieces by a digital camera?please if you amatuer astronomers have taken such photos send me.

2007-06-30 23:44:58 · 8 answers · asked by celestialviews(champion) 2 in Astronomy & Space

2007-06-30 23:30:10 · 6 answers · asked by Anonymous in Biology

Given :-
1. Sin ψ = {(3)^(1/2)} * Sin Φ
2. Tan Φ = x2/2a
3. Tan ψ= x1/a
4. x3*x2 = x1*2*a
5. (x3+2a)/(x1+x2) =[ {(x3)^2 +2*a*x3}^1/2]/a

Here Φ , ψ , x1 , x2 , x3 are variables
and 'a' is a constant

Prove that x1+x2 = {(2)^(1/2)}*a

2007-06-30 23:21:16 · 1 answers · asked by Anonymous in Mathematics

It is really hot in my city!!!

2007-06-30 23:18:15 · 7 answers · asked by true H 1 in Weather

I allways have problem to explian somone a direction.

2007-06-30 23:16:23 · 4 answers · asked by mandeep k 1 in Geography

if we enter the flow in ltr it has to display as we like cc or m3 or other available units

2007-06-30 22:45:37 · 4 answers · asked by singa d 1 in Engineering

2007-06-30 22:44:28 · 4 answers · asked by irismalejana 1 in Zoology

2007-06-30 22:43:47 · 7 answers · asked by Anonymous in Chemistry

2007-06-30 22:39:00 · 3 answers · asked by College Student 2 in Chemistry

A surgeon makes an incision medially from the left axillary region, turning inferiorly at the midline and proceeding to the puvic region. Could any one map out the path of the cut on the patients chest

2007-06-30 22:34:52 · 3 answers · asked by Richmond V 1 in Medicine

2007-06-30 22:31:22 · 9 answers · asked by sandnigga_og 2 in Earth Sciences & Geology

2007-06-30 22:27:24 · 5 answers · asked by mehdi n 1 in Earth Sciences & Geology

2007-06-30 22:25:50 · 11 answers · asked by Anonymous in Physics

2007-06-30 22:25:48 · 10 answers · asked by linga a 1 in Mathematics

2007-06-30 22:12:44 · 4 answers · asked by strawberrycandies 1 in Biology

On a map, 1/3 inch equals 15 miles. The distance between two towns on a map is 3 2/3 inches. How many miles are actually between the two towns

2007-06-30 21:50:32 · 9 answers · asked by dexter trimble 1 in Geography

2007-06-30 21:42:17 · 13 answers · asked by ashoaiee 1 in Physics

2007-06-30 21:42:13 · 5 answers · asked by Anonymous in Mathematics

2007-06-30 21:38:20 · 14 answers · asked by Anonymous in Astronomy & Space

Is it so that the Sun is not in the middle of the elliptical orbit of the earth? How is it possible that we have only one summer in a year, when earth comes close to sun twice in a year?

2007-06-30 21:32:52 · 17 answers · asked by Anonymous in Astronomy & Space

2007-06-30 21:32:42 · 9 answers · asked by tracyterry 3 in Astronomy & Space

2007-06-30 21:29:55 · 3 answers · asked by Anonymous in Mathematics

2007-06-30 21:28:07 · 6 answers · asked by clarissa 2 in Medicine

I've probably spent too much time staring at the glowing little egg and breathing too many fumes, but for years now I ve melted gold in some old pottery crucibles. Ive had some luck with sticking the tip of a stainless steakknife in the molten gold and slowly sifting-out little pieces of metal that aren't quite in a liquid state. This process I use also is to set up a piece of pottery so it's directly above a cast iron skillet full of distilled water. Once the molten gold is 'clear' (actually looks like yellowish mercury) I get to a point where I take some big pliers and spill the molten blob right into the water. If I could control the spill so that it cools while it's still going down in the water, wouldn't the bottom part be heavier and thus of purer form? If I grind this piece of alloy with a course file into little shavings would that help help before using nit/acid? I've got some merc, too, but I'd like to find a way that's chem-free and just uses gravity. Or melting temps.

2007-06-30 21:21:24 · 1 answers · asked by jemrx2 4 in Chemistry

2007-06-30 21:20:58 · 9 answers · asked by alyson.earle 3 in Other - Science

2007-06-30 21:14:30 · 6 answers · asked by Suraj 1 in Engineering

I know they say the giraffee has less intelligenge and smallest brain -so whats the smartest and most intelligent animal/mammel. one thought was the whale or dolphin-not surethough

2007-06-30 21:13:24 · 13 answers · asked by fluffy 1 in Zoology

2007-06-30 21:11:56 · 9 answers · asked by Anonymous in Biology

2007-06-30 21:10:46 · 10 answers · asked by dexter trimble 1 in Mathematics