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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><head> <TITLE>Virtual Laboratory: Cannon</TITLE></HEAD><BODY> <TABLE BORDER=0 WIDTH="100%"><TR> <TD align=left><H5> Mechanics </H5></TD> <TD align=center><H4> Cannon </H4></TD> <TD ALIGN=right><H5> Page 1 </H5></TD></TR></TABLE><HR><H2 ALIGN=CENTER>Experimental Instructions </H2><P>Welcome to the ballistic simulator. Each new shot has a trajectory whichis color coded. You get a maximum of 4 shots; when out of ammo press themore button. </P><P>This virtual experiment is designed to let the student measure the relationbetween muzzle velocity (which determines projectile energy), gravitationalpotential and the effects of frictional drag caused by wind speed blowingopposite to the direction the projectile is moving in. </P><P>Oefeningen om te proberen </P><OL><LI>Try to hit the target in 4 ties staring with the default settings andonly changing the velocity (i.e. the kinetic energy) </LI><LI>After you have successful hit the target double the gravity (i.e. raiseit to -19.6). By what factor do you have to increase the velocity in orderto now hit the target? </LI><LI>Now set the windage slider to -14 units and turn drag on with the dragbutton. Compare the trajectory with and without the drag feature. </LI><LI>Wat denk je dat er nu zal gebeuren ?if you lower the density of theprojectile with the drag turned on? </LI></OL><P><applet name="natsimname0" code="cannon" codebase="../etc/" width=600 height=490><PARAM NAME="max cannonballs" VALUE="8"><PARAM NAME="random cannonballs" VALUE="true">This applet requires a Java enaled browser to function. If you are seeing this message, you are either not using a Java enabled browser, you have Java turned off, or the applet is broken. If you suspect the latter, please send a message to <A HREF="mailto:ser@javalab.uoregon.edu">Sean Russell</A> describing your problem. Please include which operating system, what kind of computer, and which web browser you were using when the problem occurred.</APPLET></P><H4>Here is your assignment:</H4><P>The enemy band of tenured professors is approaching. Unfortunately youforget your handy supply of cannon balls and all you have is some textbooksand there is a 50 mile an hour head wind. The density of the textbooksis 0.55 (1/2 that of a cannon ball). Set the windage to -50, make suredrag is turn on and try to hit the target that represents the enemy bandof tenured professors. Enlist the aid of an untenured professor to help.You have 4 shots, else the tenured professors will become "aware"(if that is possible) of the ballistic textbooks coming in their generaldirection. <BR><P><HR>Applet coding by Sean Russell <BR>Graphic images by Amy Hulse <BR>Content by <A HREF="http://zebu.uoregon.edu">Greg Bothun</A> <hr><p><font face="Verdana" size="2">Simulations and images are loaded from the original site:<br><a href="http://jersey.uoregon.edu/vlab/Cannon/"><!--orgUrl-->http://jersey.uoregon.edu/vlab/Cannon/<!--orgUrl--></a></font></p><p><font size="2" face="Verdana"><b>Download options:</b></font></p> <p> <font face="Verdana" size="2">[<a href="http://natsim.net/cgi-bin/ps/download.pl?url=http%3A%2F%2Fnatsim.net%2Fnl%2Fwimpeeters%2Fkanon.html&mode=html">html</a>] - leaves the program files and images at the original site.<br>This resolves some copyright issues, but won't work off-line.</font></p> <p> <font face="Verdana" size="2">[<a href="http://natsim.net/cgi-bin/ps/download.pl?url=http%3A%2F%2Fnatsim.net%2Fnl%2Fwimpeeters%2Fkanon.html&mode=zip">zip</a>] [<a href="http://natsim.net/cgi-bin/ps/download.pl?url=http%3A%2F%2Fnatsim.net%2Fnl%2Fwimpeeters%2Fkanon.html&mode=exe">exe</a>] - for <i>off-line use</i>, attempts to download program and image files, too.<br>This may violate copyright on these resources (see 2.)</font></p><p><font face="Verdana" size="2"><b>Copyright:<br><br></b>If you want to use this web page elsewhere you need to ask permission from </font></p> <ol style="font-family:Verdana; font-size:12;" type="1"> <li><font face="Verdana" size="2">the author of the html page (the text)</font></li> <li><font face="Verdana" size="2">the author of the resources (programs, images).<br>- in case of Physlets (TM) see: <a href="http://webphysics.davidson.edu/applets/DownLoad_Files/intro_download.html" target="_blank">Conditions</a>.</font></li> </ol></body></HTML>?? 快捷鍵說明
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