From nivair at MIT.EDU  Wed May  9 16:08:18 2007
From: nivair at MIT.EDU (Nivair H. Gabriel)
Date: Wed, 09 May 2007 16:08:18 -0400
Subject: [Unified-mailman] F19 mass regrade
Message-ID: <20070509160818.abxhkz1fu74g4coc@webmail.mit.edu>

Hey students,

After looking over F19 (from Problem Set 9) again, I realized that I unfairly
took off a point from a few of you.  The solution for F19, part c. assumes that
air will flow out of the bottle until it is completely evacuated and there is
*nothing* left inside.  Many of you, however, solved for the minimum time while
taking into account the fact that air would flow out of the bottle only until
the pressure inside the bottle was equal to the atmospheric pressure.  This is
a slightly harder way to do it, but certainly more valid, and the problem
statement didn't specify an assumption.

As such, if you solved it that way and I took a point off, please leave your
problem set in my dropbox by the TA office -- I'll add it back and let Christy
and Jenny know.  If you solved it using the first assumption, keep your points;
that is the way the solution solves it, after all.

Finally, sorry I didn't catch this before, and good luck in the Flight
Competition.

cheers,
Nivair


-- 
Nivair H. Gabriel
Aeronautical/Astronautical Engineering
Class of 2008
Massachusetts Institute of Technology

http://web.mit.edu/nivair/www/

DO ONE THING EVERY DAY THAT SCARES YOU.
- Eleanor Roosevelt





From srhall at MIT.EDU  Thu May 10 13:24:16 2007
From: srhall at MIT.EDU (Steven R. Hall)
Date: Thu, 10 May 2007 13:24:16 -0400
Subject: [Unified-mailman] Unified Flying Safety lecture
Message-ID: <5A82BED7-DC35-41F1-9CF2-AB4DAFAD14D6@mit.edu>

All,

The Unified flying day safety lecture will be in 35-225, this Friday  
(tomorrow) at 4:00 pm. We hope to take only about 1/2 hour. Note that  
this time does conflict with the last hour of the flying competition  
on Friday, so if you need to come to the safety lecture (as you do if  
you want to fly next Wednesday), you should ensure that you have  
completed your contest flights before 4:00 on Friday, or that someone  
on your team can fly in your absence.

Thanks!

SH