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Reply #1 on: January 30, 2004, 11:23:48 am » |
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 Subject: Re: thanks! Date: Sat, 05 Dec 1998 18:52:08 -0500 From: dgoodwin <dgoodwin@1st.net> To: Fu-Kwun Hwang <hwang@phy03.phy.ntnu.edu.tw> Thanks so much for taking the time to send me the http for circular motion and ang. mo. I really appreciate it. It's great stuff. Bye for now. Dave G. Fu-Kwun Hwang wrote: > I am really sorry for the late reply. This message was misplaced. > There are two java applets related to the angular > Kepler motion: http://www.phy.ntnu.edu.tw/java/Kepker/Kepler.html > and circular motion > http://www.phy.ntnu.edu.tw/java/circularMotion/circular3D_e.html > > dgoodwin wrote: > > > Do you have any applets on angular momentum?? > > > > Fu-Kwun Hwang wrote: > > > > > dgoodwin wrote: > > > > > > > We were reviewing vector addition this evening at a study session. > > > > Someone asked about help from the internet, so we searched and happened > > > > to find your page. There were a few "ah-ha's" when the program showed > > > > the parallelogram method for adding vectors so clearly. Thanks. > > > > > > I am very happy to know that you are enjoy the java applets. Any > > > suggestions you might have about my java applets will be highly > > > appreciated! Or , if you would like to have java applet one any topic > > > related to physics, > > > Just send me a note! Enjoy the virtual physics laboratory!
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Reply #2 on: January 30, 2004, 12:44:33 pm » |
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 Subject: Very Nice Applet Date: Sun, 01 Aug 1999 18:34:25 -0500 From: Greg Hecht <ghecht@ix.netcom.com> To: hwang@phy03.phy.ntnu.edu.tw Very interesting and educational java applet, sir. My compliments. I am not an astronomer but studied Kepler's laws years ago. Your applet is the best tool I have ever seen to allow one to grasp the concepts. Thank you for creating and sharing it. Cheers, Greg Hecht, MCSE The Riverpoint Group, Ltd. Kansas City
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Reply #3 on: January 30, 2004, 12:49:23 pm » |
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 Subject: kepler motion applet Date: Thu, 23 Sep 1999 06:00:13 -0700 (PDT) From: lee taishen <leetaishen@yahoo.com> To: hwang@phy03.phy.ntnu.edu.tw Dear Mr. Hwang, Referring to the kepler motion applet in the below add. http://www.phy.ntnu.edu.tw/java/Kepler/Kepler.html I find it very interesting. However, I have some difficulties when using the applet. 1. For second kepler law, the area of the shaded area and non-shaded area should be the same. However, there is no data showing what the area is. 2. for third kepler law, i observed that there is no indication of the period of the planet. There is this T value indicated in the applet but it is not the period. i would appreciate if you can explain what the T value is. thank you. best regards leetaishen
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shiva
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Reply #4 on: September 19, 2005, 11:07:53 pm » |
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 Dear Friend, I am looking for applets related to rotational motion, angular momentum, torque and kepler's laws to teach my students. Can anybody help me? with thanks, Shiva: s_iva20290@yahoo.co.in
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Fu-Kwun Hwang
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Reply #5 on: September 21, 2005, 07:16:02 am » |
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 Please write down in more detail what kind of simulation you really want? (What kind of presentation/GUI view/...)
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wuenscher
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Reply #6 on: June 22, 2006, 03:19:32 pm » |
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 Hallo, you have written a nice applet.  I want to start writing physical applets. Could you send me some source code? It would help me to understand applet programming. :!: At first I want to write an applet about the Kepler problem perhabs with an r^-a potential, so your applet would be a good start for me. Thanks. michael
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Fu-Kwun Hwang
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Reply #7 on: June 22, 2006, 03:34:51 pm » |
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 You should have received source code in your email box now.
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Prihatmoko
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Reply #8 on: March 03, 2007, 12:53:30 pm » |
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 Hello Mr Hwang I do believe that it is more beatiful if this applet give some addition by giving user a chance to change the eccentricity of ellips, so people like me can also watch how much different between the rotation of earth and pluto...even it is a planet no more  Thanks....
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Fu-Kwun Hwang
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Reply #9 on: March 04, 2007, 09:50:26 am » |
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 You can do what you want with that applet.  If you did not change the default setting in the applet: Fix kinetic energy when change initial conditions. You will get planet motion with the same eccentricity of ellips. However, if you change it to " fix angular momentum", then you will get planet motion with different eccentricity of ellips.  That is why I add the following sentences in the page: You can drag the blue arrow to change its initial condition in three different modes: 1. fixed kinetic energy 2. fixed angular momentum 3. arbitrary Find out the relation between shape and size of the trajectory with the above parameters.
I hope students can really play with it and discover the difference , and figure out some relations! 
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tropical72
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Reply #10 on: April 23, 2007, 12:57:10 pm » |
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 Dear Mr.Hwang I'm a student majoring in CS. I'm preparing a code of Kepler's law. Luckly I found your homepage and saw the simulation. That's really cool and great. I tried your simulation for a long time and became curious how it was implemented. If it's possible, could you send me the source code of the simulation? That's would be greatly helpful to know the Kepler's Law and the Java programming both. Thanks in advance Hyuck
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Fu-Kwun Hwang
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Reply #11 on: April 23, 2007, 03:39:08 pm » |
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 I just sent you the source code. You should have received it now.
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shiksha12
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Reply #12 on: October 01, 2007, 06:19:17 am » |
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« Last Edit: October 07, 2007, 05:11:59 am by shiksha12 »
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Fu-Kwun Hwang
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Reply #13 on: October 06, 2007, 05:51:11 pm » |
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 I do not know how to help because you did not say what kind of help you need!
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shiksha12
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Reply #14 on: October 07, 2007, 05:11:18 am » |
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« Last Edit: October 09, 2007, 12:24:30 am by shiksha12 »
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Fu-Kwun Hwang
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Reply #15 on: October 07, 2007, 12:02:30 pm » |
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 Could you at least explain what you want to create? What kind of simulation? What you want to show in the simulation? Do you have the formula now? What are the form of your formula? What is your model for the simulation? There are so many information which you did not provide. I can not read your mind. I think you also need to learn: How to ask a question effectively? How to explain your problem? If I do not have a very clear picture of what you really want to do. There is no way I can help.
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shiksha12
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Reply #16 on: October 09, 2007, 07:09:00 am » |
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« Last Edit: October 11, 2007, 08:34:06 am by shiksha12 »
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Fu-Kwun Hwang
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Reply #17 on: October 10, 2007, 10:57:43 am » |
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 Kepler is a simplify model to understand the motion of planets. If you want to know the detail of the trajectory, yes. you need Newton's law. You can check out motion of Moon, Earth relative to the Sun, which simulate gravitation forces between 3 objects. If you have more planets, it can be done with simulation easily. But you will have to set up the right initial conditions, otherwise, the system might not form a solar system if the total energy is not in the correct range.
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gk8
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Reply #18 on: November 08, 2007, 04:53:11 pm » |
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 Hello, Can you please send me source code for Kepler motion? Nice applet. Thx
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Fu-Kwun Hwang
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Reply #19 on: November 08, 2007, 10:02:59 pm » |
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 You should have received the source code now.
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tharses
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Reply #20 on: November 16, 2007, 03:49:19 pm » |
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 Hello it would be nice if you could send me the source code of the kepler s motion applet !! thanks tharses(tharses@hotmail.com)
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Fu-Kwun Hwang
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Reply #21 on: November 16, 2007, 08:44:58 pm » |
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 You should have received the source code now.
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Azmodaii
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Reply #22 on: January 10, 2008, 09:25:46 pm » |
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 Hello, your applet is extremely helpful to me and I was wondering if i could also possibly get the sourcecode for this applet as well... my email is azmodaii@gmail.com. thank you in advance
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Fu-Kwun Hwang
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Reply #23 on: January 10, 2008, 10:58:09 pm » |
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 You should have received the source code now.
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vladi
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Reply #24 on: January 11, 2008, 02:48:37 pm » |
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 Dear Mr.Hwang, can you please send me source code for Kepler motion? thanks
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Fu-Kwun Hwang
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Reply #25 on: January 11, 2008, 09:26:20 pm » |
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 You should have received it now.
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quinteroc
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Reply #26 on: February 14, 2008, 04:27:16 am » |
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 Hi I am a student of physics from Venezuela...I really like your applet Could you send me the source please?? I would appreciate it...
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Fu-Kwun Hwang
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Reply #27 on: February 14, 2008, 10:32:12 am » |
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 I just add the source code to the zip file for download because there are so many request for source code. Please download it again(click get applet file for offline use button ) and you will find the source code.
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aesha
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Reply #28 on: February 15, 2008, 03:40:39 pm » |
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 thank u so much for your help. i just got what i wanted !!! Thanks for adding source code file in zip ile.!! 
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aesha
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Reply #29 on: February 15, 2008, 03:44:04 pm » |
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 thank u so much for your help. i just got what i wanted !!!!! 
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« Last Edit: February 15, 2008, 03:47:01 pm by aesha »
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