112 reputation
9
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location Tehran
age
visits member for 2 years, 3 months
seen Jan 21 at 16:11

Iran Mathematical Olympiad Silver Medalist 2010

Iran Mathematical Olympiad Gold Medalist 2011

International Mathematical Olympiad Bronze Medalist 2012

Studing Mechanical Engineering at Sharif University of Technology


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
Nov
6
asked Projectile motion along the earth