Hi, Guys

Here is the world cup schedule:

http://soccernet.espn.go.com/worldcup/fixtures?&lpos=wcnav&lid=gn_sn_WC+fixtures\
&cc=5901

Go Serbia & Montenegro !!! Go the death group !!!




>From: Jie Fan <shili5_fan@...>
>Reply-To: ucsb_cba@yahoogroups.com
>To: ucsb_cba@yahoogroups.com
>Subject: Re: [ucsb_cba] To liu Fei and Zhang Rui: Why the airplane is
>faster from west to east
>Date: Mon, 5 Jun 2006 10:26:34 -0700 (PDT)
>
>Does it have any effect when we shooting the ball, then we'll take this
>into consideration when we stand at west side and try to make a shot:-)
>
>Chen Liguo <cliguo@...> wrote: About the the 4th point, there
>is no need to argue about. It is very obvious from that map.
> About the 2nd point, the accelaration is centripetal accelaration.
> The 3rd point, you should think more. The airplane can adjust lift by
>"attack angle" mechanism. So the airplane, should be in the same height,
>but with different lift. The difference between lift and weight can
>provide the centripetal force. Again, my calculation is this force
>extremly small, for normal airplane speed(absolute speed), which is 10e5
>times smalller than gravity force. So the difference caused by directions
>is even smaller. That is also the point I mentioned in last email.
>
> Liguo
>
>rui zhang <zhruirui@...> wrote:
> To Liguo and Fei,
>
>Thank Liguo for the nice webpage. I also thought about this problem last
>night and
>got similar conclusion (although I don't know why the wind is from east to
>west).
>Here are some comments:
>
>1. About the wind: First, all air around earth moves with the same angular
> velocity as earth. In this case, there is no wind: means we feel nothing
>since we are moving
>with earth by ourselves. Second, there is the heat from the sun and
>pressure difference on different area and so on. Then air have relative
>motion to the earth, this is what we call wind (as explained in the second
>website you offered).
>
>2. I don't know which angular accelaration Liguo is calculating. The earth
> is rotating in a constant angular velocity. There should be no angular
>accelaration at all!
>
>3. I have a prediction. If we say the speed of airplane (relative to the
>earth) is faster from west to east, due to the effect of the wind, then we
>should have following prediction: the hight of the airplane will be higher
>when the airplane is from west to east than from east to west. The reason
>is: even though the relative speed is the same, the absolute speed of the
>airplane is different. If we consider the airplane
>is doing a part of the circular motion around the center of the earth, its
> speed is higher if it fly from west to east. For the higher speed, we
>have the same centripitual force (gravitation force - elevation force from
>air which is proportional to the relative speed), then the radius of
>circular motion must be larger. But this hight difference could be very
>small.
>
>4. On the second website, I saw a map of the direction of winds. It looks
>like it is not
>always from west to east. So it is possible to some airlines we fly faster
>from east to west. What do you think?
>
>Rui
>
> On 6/4/06, Chen Liguo <cliguo@...> wrote: It is mainly
>because of the winds effect. Here is the link from internet
> http://aerospaceweb.org/question/dynamics/q0027.shtml
> Just like we said, it is mainly because of the winds. But the
>directions of the winds are not simply from the earth rotation. Here is
>another link about the winds
> http://www.gpc.edu/~pgore/Earth&Space/GPS/wind.html
>
> Also to Zhang Rui, we can regard the system as inertial system, since
>the angular velocity induced force is very small compared with the
>gravity. I did the calculation
> rotation acceration is about 10 e-5 which is much smaller than g=9.8.
>
> Well it is a nice discussion with you guys!
>
> Liguo
>
>
>rui zhang <zhruirui@...> wrote:
> rt
>
>
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