help with rectlinear/curvilinear

• WoAiMeiMei

  8 Aug 08, 16:17

  i checked the picture and it's 8x and it seems 2y dy/dt = 12x^2 dx/dt + 8dx/dt is the way to go o.o i just dont see why the difference in values is sooo big
• eagle

  8 Aug 08, 16:20

  if it is 8x, then you are right

  later tonight I calculate again... got work and then tuition tonight

• WoAiMeiMei

  8 Aug 08, 16:21

  very hardworking..! don't forget olympics opening haha
• eagle

  8 Aug 08, 16:22

  Originally posted by WoAiMeiMei:

  very hardworking..! don’t forget olympics opening haha

  no time to watch la...

  my new student... only hv 3 lessons before prelims... trying to pull to at least B3 first.... hopefully

• WoAiMeiMei

  9 Aug 08, 17:25

  yeah hmmm...
• WoAiMeiMei

  10 Aug 08, 17:35

  i got 25.588 m/s^2.... not sure if it's right or not ._. my d2y/dt2 was negative 24.6126!! ??

  tomorrow is the d-day ._.

   

  update: managed to do it... the differentiation chain rule is wrong for the second part, and what we've found is "overall" acceleration. so needed to find the components using trig