Jaime
Reputation
3,122
Next privilege 5,000 Rep.
Approve tag wiki edits
 Dec 27 awarded Yearling Aug 16 comment Is two cars colliding at 50mph the same as one car colliding into a wall at 100 mph? Yes, that's the way I see it. Aug 15 comment Is two cars colliding at 50mph the same as one car colliding into a wall at 100 mph? Nope. The reference frame is not tied to the car, it is an inertial reference frame that happens to be one that the first car is stationary in at the starting time. A stationary car hit by another car will not stand still, but start moving backwards at half the speed of the incoming car. Aug 15 revised Finding optimal angle for projectile, taking into account linear (Stokes) drag added 2 characters in body Dec 27 awarded Yearling Nov 26 revised How thick does steel have to be to be able to withstand 300 bar (sphere) added 1 character in body Nov 26 reviewed Approve How thick does steel have to be to be able to withstand 300 bar (sphere) Aug 7 awarded Nice Answer Dec 27 awarded Yearling Sep 3 awarded Nice Answer Feb 3 comment Falling through the rotating Earth @PeterShor Thanks! I did get to the Wikipedia page on Bertrand's theorem (en.wikipedia.org/wiki/Bertrand's_theorem) about half an hour after finishing my fight above with polar coordinates... Feb 3 answered Falling through the rotating Earth Jan 30 revised Where can I check a solution to 3D Navier Stokes? added 242 characters in body Jan 30 answered Where can I check a solution to 3D Navier Stokes? Jan 29 comment Which is the axis of rotation? Of course in three dimensions things don't rotate around a point, but around an axis. Still there always is a well defined, instantaneously stationary line, around which the object is rotating at any given moment. Jan 29 comment Which is the axis of rotation? While your anlysys is correct, the canonical answer to "which point the body is rotating about" would be that it is rotating around the instant centre of rotation: en.wikipedia.org/wiki/Instant_centre_of_rotation Jan 27 comment Finding optimal angle for projectile, taking into account linear (Stokes) drag @m0nhawk Not really. I just chose the obvious units for velocity and time, and then $\lambda$ forms on its own. But you could get it that way too. Jan 27 revised Finding optimal angle for projectile, taking into account linear (Stokes) drag added 330 characters in body Jan 26 answered Finding optimal angle for projectile, taking into account linear (Stokes) drag Jan 25 reviewed Looks OK How feasible is Laser Plasma Acceleration for the post-LHC world?