gwiyomi17 Posted April 2, 2014 Share Posted April 2, 2014 My answer for a is the Y-track My reason (for b) is because Y-track has more steeper slope which will give the ball a greater speed. I need to explain it further, I just need help with letter B. I already finished C and D oh i think i posted my question in the wrong section, sorry Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted April 2, 2014 Share Posted April 2, 2014 My answer for a is the Y-track My reason (for b) is because Y-track has more steeper slope which will give the ball a greater speed. I need to explain it further, I just need help with letter B. I already finished C and D oh i think i posted my question in the wrong section, sorry I assume this is homework. Can you tell us your answers for c) and d). I think that may help with answering b). Link to comment Share on other sites More sharing options...
CaptainPanic Posted April 2, 2014 Share Posted April 2, 2014 ! Moderator Note oh i think i posted my question in the wrong section, sorry No worries. That's what you have your friendly moderators for. We'll move a post on request (and I read this as a request). It's put in the homework section now. Link to comment Share on other sites More sharing options...
studiot Posted April 2, 2014 Share Posted April 2, 2014 (edited) Look here for brachistochrone. http://www.google.co.uk/search?hl=en-GB&source=hp&q=brachistochrone&gbv=2&oq=brachistochrone&gs_l=heirloom-hp.1.0.0l10.1297.4797.0.10735.15.10.0.5.5.0.172.1469.0j10.10.0....0...1ac.1.34.heirloom-hp..0.15.1657._XFvibAUHQM Edited April 2, 2014 by studiot Link to comment Share on other sites More sharing options...
rktpro Posted April 2, 2014 Share Posted April 2, 2014 Familiar with conservation of energy? Link to comment Share on other sites More sharing options...
gwiyomi17 Posted April 2, 2014 Author Share Posted April 2, 2014 I assume this is homework. Can you tell us your answers for c) and d). I think that may help with answering b). For c I said that the total energy after the balls were realeased is the same or equal to their total energy before they were released since friction is neglected. (energy is conserved) for d i solved it using the conservation of energy and i got v=sqrt(2gh) ! Moderator Note No worries. That's what you have your friendly moderators for. We'll move a post on request (and I read this as a request). It's put in the homework section now. THank you very much Look here for brachistochrone. http://www.google.co.uk/search?hl=en-GB&source=hp&q=brachistochrone&gbv=2&oq=brachistochrone&gs_l=heirloom-hp.1.0.0l10.1297.4797.0.10735.15.10.0.5.5.0.172.1469.0j10.10.0....0...1ac.1.34.heirloom-hp..0.15.1657._XFvibAUHQM I alrready searched for it, but the mathematical explanations are too advanced for my level so I don't quite understand it but the videos are interesting Familiar with conservation of energy? Yes Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted April 4, 2014 Share Posted April 4, 2014 For c I said that the total energy after the balls were realeased is the same or equal to their total energy before they were released since friction is neglected. (energy is conserved) for d i solved it using the conservation of energy and i got v=sqrt(2gh) OK, so you are assuming no losses due to friction and disregarding the rotational energy...an idealized case. So you know they are both at the same speed at the bottom, and that Y has a slightly longer path, though it is not defined exactly it is a smooth curve. Which one accelerates faster at the start? What is the speed of X, halfway along its path? How much faster is Y moving, halfway along it's path? Link to comment Share on other sites More sharing options...
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