1,280 reputation
1025
bio website dotancohen.com
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age 37
visits member for 3 years, 4 months
seen 48 mins ago

Sep
15
answered A machine which copies any object with 100% accuracy?
Sep
13
awarded  Popular Question
Aug
10
awarded  Yearling
Jul
25
awarded  Popular Question
Jul
19
comment Why aren't gas planets and stars fuzzy?
possible duplicate of Why is Jupiter so sharply defined?
Jul
19
awarded  Citizen Patrol
Jul
9
accepted Beads in 'perpetual motion'?
Jul
9
comment Beads in 'perpetual motion'?
Wow, thanks, that is a great edit! It is so elegant once I see it! I assume that v is the initial velocity imparted by the hand? Thank you!
Jul
8
comment Beads in 'perpetual motion'?
Thank you. I suppose then that there is very little friction in this system? Also, I am having a difficult time determining a method for calculating the amount of force being exerted on the floor.
Jul
8
asked Beads in 'perpetual motion'?
Jun
26
accepted Why is the Pegasus launched from a subsonic airplane?
Jun
26
comment Why is the Pegasus launched from a subsonic airplane?
Thank you, I did not realise everything else in the launcher.
Jun
26
answered Why are spacecraft made to “spin” after launch?
Jun
26
comment Why is the Pegasus launched from a subsonic airplane?
Thank you. I don't see any information even suggesting that the M-21 crash was due to to a supersonic separation.
Jun
26
comment Is space “real”, or is it some sort of accepted postulate?
Spacetime
Jun
26
comment Is space “real”, or is it some sort of accepted postulate?
I see, Peter, you mean the dimensions of space. You'll be happy to known that we can in fact measure them, and there there are more than just three of them!
Jun
26
answered Is space “real”, or is it some sort of accepted postulate?
Jun
26
asked Why is the Pegasus launched from a subsonic airplane?
Jun
6
comment Might a planet perform figure-8 orbits around two stars?
Thank you, the illustration makes it clear exactly why this system is unstable.
Apr
23
awarded  Popular Question