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Oct
25
awarded  Popular Question
Oct
29
awarded  Popular Question
Sep
24
awarded  Autobiographer
Jul
10
awarded  Curious
Jan
6
comment Spontaneous motion in a wind tunnel
You're right, but still as it travels with a speed $V_1$ lower than $V$ (and hence lower than $V_2$) a forward net thrust is produced.
Jan
6
comment Spontaneous motion in a wind tunnel
You're right, but is that difference large enough to affect the velocity at the exit? I think the problem may be with the velocity profile that is assumed uniform here, but I can't prove it.
Jan
6
revised Spontaneous motion in a wind tunnel
edited tags
Jan
6
comment Spontaneous motion in a wind tunnel
Would you please give a reference for that?
Jan
6
comment Spontaneous motion in a wind tunnel
Maybe I should have explained a little more. By hollow I mean that the cylinder has a small thickness $t$ which is negligible compared to the dimensions of the cylinder. Also, $A_1$ and $A_2$ are the cross-sectional areas that the air flow can pass through them.
Jan
6
revised Spontaneous motion in a wind tunnel
added 1 characters in body
Jan
6
asked Spontaneous motion in a wind tunnel
Dec
11
awarded  Benefactor
Dec
10
accepted Elastic collision in two dimensions
Dec
10
comment Elastic collision in two dimensions
Actually this isn't a homework problem at all, and someone else added the homework tag!
Dec
9
awarded  Promoter
Dec
9
awarded  Editor
Dec
9
revised Elastic collision in two dimensions
added 1302 characters in body
Dec
6
comment Elastic collision in two dimensions
actually the problem is that I don't know how to start! I used those equations to eliminate three of the seven variables, but at the end I reached a rather long and ugly expression for which I didn't know how to convert it to the requested one. For this reason, I decided not to write my works. If you still want them, I can write them.
Dec
6
asked Elastic collision in two dimensions
Nov
11
accepted Projectile motion along the earth