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Ball to Ball Collision - Detection and Handling

...n) will stay the same for both balls. You can get the collision components by creating a unit vector pointing in the direction from one ball to the other, then taking the dot product with the velocity vectors of the balls. You can then plug these components into a 1D perfectly elastic collision equa...
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What is the difference between Spring, Struts, Hibernate, JavaServer Faces, Tapestry?

...t-based presentation framework. JavaServer Pages is a view technology used by all mentioned presentation framework for the view. Tapestry is another component-based presentation framework. So, to summarize: Struts 2, JSF, Tapestry (and Wicket, Spring MVC, Stripes) are presentation frameworks. If...
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How do you organise multiple git repositories, so that all of them are backed up together?

...I think the missing thing is a way that git can keep it's objects separate by subtree so that a single "repository" can be composed of separate synchronized though separable units (individually downloaded without the rest) in such a way that people can work on specific subsets without knowing about ...
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How to test an Android Library Project

... I got it to work by just changing the package name of test project in it's manifest (and the package under test - which should be the same) to NOT coincide with the package name of the library project, plus removing the reference to the targe...
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How to write string literals in python without having to escape them?

... Understood. And if a 'split()' is used on this string, will it split by lines by default? – MadPhysicist Apr 28 '17 at 19:37 1 ...
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Resolve conflicts using remote changes when pulling from Git remote

... You can either use the answer from the duplicate link pointed by nvm. Or you can resolve conflicts by using their changes (but some of your changes might be kept if they don't conflict with remote version): git pull -s recursive -X theirs ...
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Validating parameters to a Bash script

...did "$#" to fix it. second, the regex also matches "foo123bar". i fixed it by doing ^[0-9]+$. you may also fix it by using grep's -x option – Johannes Schaub - litb Mar 31 '09 at 1:21 ...
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GitHub pages are not updating

... in my last commit. I had to edit index.html (which uses the image), just by changing some white space, in order to get GitHub Pages to start serving the image. I suspect it doesn't rebuild unless an HTML page changes. – Paul Lynch Apr 13 '17 at 21:09 ...
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Check if value is in select list with JQuery

... If you create new options by JavaScript using this logic: $('#select-box').append($('<option value="' + value + '">' + text + '</option>')); (or of course in more talkative style), the first example will work (you don't need to iterate). ...
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passing several arguments to FUN of lapply (and others *apply)

...st, it looks like lapply passes the entire list at once instead of element by element as with 'input'. – Alan Aug 27 '15 at 1:10 10 ...