Goodarz Mehr
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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