1,936 reputation
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bio website dotancohen.com
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age 37
visits member for 4 years
seen 1 hour ago

SOreadytohelp


Aug
17
answered Am I attracting Pluto?
Aug
13
comment Halley's Comet as a “Free Taxi”
@ericksonla: I believe that the word you are looking for is "lithobraking".
Aug
11
comment Is a bomb's shockwave strong enough to kill?
In 2006 in Lebanon a mortar landed just about a meter or two away from me. I was wearing a helmet, combat vest, and very light (shrapnel) armor at the time. There was no shrapnel from the (possibly improvised) mortar, but the blast blew me back into the wall behind me and I was out for a few seconds. I'm still here to tell about it!
Aug
10
awarded  Yearling
Jul
12
revised Why is the surface of the Moon white?
Corrected name of human on the moon.
Jul
12
suggested approved edit on Why is the surface of the Moon white?
Jul
1
comment How to emulate 40ft (12 m) of water?
By far the safest and easiest to implement solution. Any leaks or other issues that the OP will have with this method, he would have with any of the other methods as well.
Jun
8
comment Why do two flames kept side by side merge into a single flame?
Very nice answer for a relatively new P.SE member. Thank you!
Jun
1
awarded  Organizer
Jun
1
revised Why does a match go out if you hold it so the flame is up?
Add appropriate tag.
Jun
1
suggested approved edit on Why does a match go out if you hold it so the flame is up?
May
27
comment Why do electric sparks appear blue/purple?
Note that the answers below also apply to lightning.
May
19
comment Does a well-lit mirror weigh more than an unlit mirror?
Most of the effect of the light on the mirror will be on the non-reflective side, such as heating it up.
Apr
29
comment Does a truck stop faster if the stack on the back of truck is stable or if it moves forward?
@WetSavannaAnimalakaRodVance: You guys have semitrailers with an odd number of wheels? Or is the steering wheel counted in there too?
Apr
27
revised Is there any disadvantage to sending rockets straight up?
Correct accidental term swap
Apr
27
suggested approved edit on Is there any disadvantage to sending rockets straight up?
Mar
20
awarded  Inquisitive
Mar
19
comment Could we send a man safely to the Moon in a rocket without knowledge of general relativity?
I suppose that special relativity would counter a portion of the difference, my guess would be about 10-20%, considering the TLI speed of over 10 km/sec.
Mar
2
comment Why doesn't NASA use RAMJET rockets to get into space?
Related discussion on Space.SE
Mar
2
comment Why doesn't a cigarette lighter generate thrust?
@lemon: Did you cause this mess?