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How much watts would a laser beam from Mars have to be, in order to be detectable from Earth?
A typical laser pointer has a 5 milliwatt output. The most powerful laser weapon developed has a 100 kilowatt output.
Detectable by the best telescope in the world or in Earth orbit.
What's the minimum energy output a laser would have to be in order to be detected from Mars?
"Detectable" is a funny thing. If a 1 watt laser (for example) could not be detected with 1 hour of staring, it might be detectable with 10 hours. We can already detect signals carried by just a few 100 photons per second (Lunar Laser Ranging). At the typical distance to Mars, a laser there would have to send about 2.6 x 10^9 photons per second. That's only about 30 nanowatts.
On the other hand, at 20 nanowatts, the information rate would be less than 1 bit per second. The noise from the vibration of the laser (from winds and Mars quakes) would blur the signal so much, the laser would not be detectable any more. Better go up to 20 microwatts, and get about 30 bits per second. Still very slow.
When we bounced radar signals from Earth to Mars and back, we had to stare at Mars for about 30 minutes to detect the return signal.
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Filed under Pro Audio Equipment by on Apr 4th, 2010. Comment. 
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If you could re-design the Bradley what type of ATGM would you mount on it?
Within reason...no freaking sharks with freaking laser beams on their heads, no nuclear waste projecting claymores, no face hugger projectors, no holy handgrenade of Antioch......REAL and practical AT weaponry
None.
The TOW missile system (and the 2-man turret) were not infantry requirements. They were pushed on the vehicle by the Cavalry.
In the early 1970's the Army had seperate vehicle programs going on for a Cavalry scout vehicle and an Infantry vehicle. The XM800 Cav vehicle would have had a 2-man turret with missile launcher and the XM723 Infantry vehicle a 1-man turret and Full Size 9-man infantry squad. When it was decided to merge the two vehicle programs to save money the Infantry vehicle got stuck with the 2-man Cavalry turret. The extra space occupied by this turret and the stowage requirements of the missiles reduced the size of the Infantry vehicles primary weapon - its dismount squad - by 33% down to just 6 men.
From a tactical point of view giving a thin-skinned vehicle like the Brad the ability to duke it out with tanks seems suicidal as well. Against poorly trained, led and and inadequately supported conscripts the idea might be OK, but against a real enemy it seems insane. The in-action and flight time of the TOW or any other missiles is far greater than that of a tank gun.
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Filed under Pro Audio Equipment by on Apr 2nd, 2010. Comment.
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How much do you typically spend for a gift for your child to take to a birthday party?
Is the amount spend dependent on the child's age? Where the party is? I mean do you spend more if the child is going to Laser Dome vs. a home party? And would the amount change if your child does not have parties of his own where he would get a return present from this child?
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Age is the most important factor. You can get a decent $15 present for a 6 year old but I doubt you could find anything decent for that amount for a 10 year old. You want your child to be proud of the gift he brought to the party. Usually it's best to let them pick out the gift, with your guidance of course. They're probably the same age so something your child would like should be a hit with his friend.
No it doesn't matter where the party is given or if you give parties of your own. A gift should be given without expectation of compensation when your own birthday roles around and that's a good lesson to teach your child now. They're never too young to learn the joy of giving.
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Filed under Pro Audio Equipment by on Mar 24th, 2010. Comment.
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Anyone know how they used to make prints of paintings ?
Presumably they now use hi-tec laser printers, but anyone know how they did it before computers. Any links would be much appreciated.
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atsa z - for f**cks sake read the question.
The painting was photographed onto film using coloured filters so that only one colour at a time was registered.......red/ yellow / blue......or more accurately magenta / lemonish / turquoise / black. Then a printing press was set up to print each colour separately, one on top of the next until you got back to the original. The best prints use more colours than this to get as close as possible.
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Filed under Pro Audio Equipment by on Feb 19th, 2010. Comment.