VBForums - Maths Forum http://www.vbforums.com/ By popular request, a place for you to discuss Maths of all forms. Somewhere to think about algorithms and the applications of maths to programming too. en Wed, 22 May 2013 00:28:12 GMT vBulletin 60 http://www.vbforums.com/images/misc/rss.png VBForums - Maths Forum http://www.vbforums.com/ <![CDATA[[RESOLVED] What is the answer to this ?]]> http://www.vbforums.com/showthread.php?720641-RESOLVED-What-is-the-answer-to-this&goto=newpost Mon, 06 May 2013 03:35:55 GMT Name: 163584_165992090231973_792876388_n.jpg Views: 56 Size: 10.1 KB

I just saw the above on FaceBook.. Using the order of operations, the answer I came to was 1. However, a number of commenters insist passionately that the answer is 9. Some of them offer some semblance of an explanation why but I must admit, I was lost. Some people said they used something called PEDMAS which I honestly never heard of before (I know it as BOMDAS) and some people talked about some distribution principle behind their conclusions.

I'd be the first to admit that math really isn't my strong suit. I know that sounds strange coming from a programmer.

My question is, who is right ?
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]]> Maths Forum Niya http://www.vbforums.com/showthread.php?720641-RESOLVED-What-is-the-answer-to-this <![CDATA[[RESOLVED] ANGLE OF INCIDENCE IS EQUAL TO THE ANGLE OF Reflection]]> http://www.vbforums.com/showthread.php?719095-RESOLVED-ANGLE-OF-INCIDENCE-IS-EQUAL-TO-THE-ANGLE-OF-Reflection&goto=newpost Tue, 23 Apr 2013 17:24:12 GMT hey is this true even when two balls meet? is this the right way to get the answer? To get the final angle: AngleIncidence = AngleReflection AngleIncidence = (180° + InitialAngle) - (NormalAngle) AngleReflection = (NormalAngle) - (FinalAngle) Solving for FinalAngle: 180 + Init - Norm = Norm - Final 180 + Init - 2 Norm = - Final Final = 2 * Norm - 180 - Init is the InitialAngle the angle between the two balls and if so does it matter if i get the angle from A to B first or B to A first? i have the angle between B and A of 134 by 314 degrees when touching each other ball B is moving at 23 degrees ball A is moving at 229 degrees how do i get the right reflextion angle for each ball? thanks verry much hey is this true even when two balls meet?
is this the right way to get the answer?


To get the final angle:
AngleIncidence = AngleReflection
AngleIncidence = (180° + InitialAngle) - (NormalAngle)
AngleReflection = (NormalAngle) - (FinalAngle)
Solving for FinalAngle:
180 + Init - Norm = Norm - Final
180 + Init - 2 Norm = - Final
Final = 2 * Norm - 180 - Init


is the InitialAngle the angle between the two balls and if so does it matter if i get the angle from A to B first or B to A first?



i have the angle between B and A of 134 by 314 degrees when touching each other

ball B is moving at 23 degrees
ball A is moving at 229 degrees

how do i get the right reflextion angle for each ball?

thanks verry much ]]> Maths Forum flyhigh http://www.vbforums.com/showthread.php?719095-RESOLVED-ANGLE-OF-INCIDENCE-IS-EQUAL-TO-THE-ANGLE-OF-Reflection