Science & Mathematics - 7 August 2007

If we created a large mirror, blasted it off FAR into space, then beamed information at it (perhaps via light pulses?) would the data be retrievable in the future? Alternatively, could we reflect the data off a planet in case we could not create a mirror large enough? This works the same way that looking at stars at a distance is 'seeing them millions of years in the past.'

Could we get a digital satellite's video feed, convert it to light pulses, beam it at the mirror, have it beam back to us and then ten, hundreds, or thousands of years into the future 'watch' what was happening in the relative past?

2007-08-07 20:14:52 · 3 answers · asked by Smoke[MaxX] 2 in Physics

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If x = 3 and y = -2, then 2x^2 - y - 3 equals what?

If x = 3 and y = -2, then 2x^2 - y - 3 equals:
A 31
B. 17
C. 35
D. 13

I get 35 but it says the answer is 17...what am I doing wrong? I thought two negatives made a positive.

2007-08-07 20:02:02 · 14 answers · asked by Chris 2 in Mathematics

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How many people think a UFO will become seen by everyone oneday, if yes, why, if no, why not?

http://ufopensacola.blogspot.com

2007-08-07 20:01:20 · 14 answers · asked by learning_x 3 in Paranormal Phenomena

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What medication is best for heart protection?

some say asprin and some say atorvastatin calcium

2007-08-07 19:57:40 · 2 answers · asked by engelfeurs 2 in Medicine

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if you know about string theory give information?

its thory about how universe is fomed? which basic block from which universe is formed?this theory also gives the answer for that all forces can be unified.

2007-08-07 19:56:46 · 6 answers · asked by sagar b 1 in Astronomy & Space

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if you know about string theory give information?

its thory about how universe is fomed? which basic block from is universe is formed?this theory also gives the answer for that all forces can be unified.

2007-08-07 19:51:02 · 3 answers · asked by sagar b 1 in Astronomy & Space

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Does da sun orbit around the centre of gravity of the solar system?

2007-08-07 19:50:58 · 5 answers · asked by Anonymous in Astronomy & Space

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Solve this(2)?

11(base 137)=X(base 10)
what is x?

2007-08-07 19:47:30 · 3 answers · asked by Anonymous in Mathematics

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A 60 volt 6 W lamp on 60 volts draws 0.1 amps.If this lamp was supplied with 24 volts what would current be?

2007-08-07 19:42:14 · 3 answers · asked by WM 2 in Engineering

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im going to die whn im 19?

so, dooms day is apparently December 21, 2012.
and we all have 5 years to live.
do you believe that it will actually happen?
or do you think that it is all bullsh*t?

2007-08-07 19:41:55 · 7 answers · asked by blahhblahhhblahahh 4 in Astronomy & Space

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Explain why actual electron configurations for chromium & copper from those assigned using the Aufbau diagram?

I can't find an ansewer for this question in the web. Can anyone help me????? Please..... This is a part of my homework in Chemistry............... please..... I need help.....

2007-08-07 19:40:47 · 2 answers · asked by chrisbel r 2 in Chemistry

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seasons occur because the earth is tilted? True or False?

Is a tilted earth sufficient criteria for seasons on the earth? Or some other conditions should also be fulfilled?

2007-08-07 19:35:53 · 6 answers · asked by Anonymous in Earth Sciences & Geology

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How many decay events will be produced? Please explain to me what a "decay event" is... (more details below)

Radioactive copper-64 decays with a half-life of 12.8 days.
(a) What is the value of k in s-1?
(b)A sample contains 28.0 mg Cu-64. How many decay events will be produced in the first second? Assume the atomic mass of Cu-64 is 64.0.

For part (a) I calculated K as .000000627 1/sec
I don't know what a decay event is and I can't figure it out in my textbook or online. If someone could please explain to me what a decay event is (is it the amount of times the balaned reaction goes to completion? is it the number of Cu atoms that decay?)

Also if you could show me how to solve part (b) or at least give me the equation you used and answer. It must be in units of decays/s. I'm assuming you use the equation ln(N/No)=-kt

Any information at all that you can give me will be extremely helpful! Thank you so much!

2007-08-07 19:34:29 · 1 answers · asked by alice 2 in Chemistry

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Should we build a lunar settlement?

Construction of a lunar settlement has been the subject of intense research since the 90's. Engineers from all backgrounds, but notably Civil and Chemical engineering, have been involved all along.

The moon presents a strategic waypoint between Mars. It's a good refueling point, due to its location and low escape velocity. It's a vast mineral resource, rich in Oxygen and Iron and Titanium - all of which can be extracted from the soil and processed for use. The moon is also rich in Deuterium, which can be used to produce clean nuclear energy.

Current technological challenges seem more mundane than extraordinary. With no water, what can we use instead of concrete? The soil compact as it is - and it is extremely compact - how can we dig and drill, and build foundations? With the incredibly fine lunar dust, how can we protect machinery everytime a shuttle lands or takes off?

So, the question is, given our current condition, should we construct on the moon?

2007-08-07 19:33:19 · 3 answers · asked by Anonymous in Astronomy & Space

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the measure of one angle of a triangle is 6 degree more than measure of a second angle. the third angle is 30?

degrees more than the measure of he second. find the measure of each angle.

2007-08-07 19:29:21 · 9 answers · asked by natallia m 1 in Mathematics

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Which of the following is a factor of the equation?

Its been so long I've forgotten how to do this kind of math...
Which of the following is a factor of the equation:
2x^2 + x - 1?
A. (x - 1)
B. (2x - 1)
C. (x + 2)
D. (2x + 1)

2007-08-07 19:28:00 · 3 answers · asked by Chris 2 in Mathematics

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Now that Scientists have found 'Wireless Electricity' How long would you think they'll take to manufacture

a wireless car?

2007-08-07 19:26:26 · 11 answers · asked by Killraven 2 in Engineering

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If you cut an object in half and half ... how far/small can you go ?

2007-08-07 19:24:48 · 9 answers · asked by Anonymous in Physics