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r(t)=(2t, wt, 4t) in cylindric coordinates. How do I find v(t)?
 one year ago
 one year ago
r(t)=(2t, wt, 4t) in cylindric coordinates. How do I find v(t)?
 one year ago
 one year ago

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TuringTestBest ResponseYou've already chosen the best response.1
I can't see how it is anything other than just differentiating wrt t
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
I think the problem is that the unit vectors in cylindric coordinates also vary with time so it is not just v(t)=(2,w,4)
 one year ago

TuringTestBest ResponseYou've already chosen the best response.1
so the directions here are\[\hat r,\hat\theta,\hat z\]I suppose, eh?
 one year ago

TuringTestBest ResponseYou've already chosen the best response.1
do you know the answer?
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
No, however I just computed v(t)=(2, 2t*w, 4) but I don´t know if is correct or not.
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
I also have no clue how I could ask wolfram alpha to check that.
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
I used this formula but I am not entirely sure if this formula fits that problem.
 one year ago

TuringTestBest ResponseYou've already chosen the best response.1
I have never seen that formula, so I can't verify it...
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
I thought this is a "simple" problem.^^
 one year ago

TuringTestBest ResponseYou've already chosen the best response.1
http://www.maths.ox.ac.uk/system/files/coursematerial/2012/1115/77/CylCoords.pdf that formula you have seems to be right, though I can't seem to see where they get the extra rho from
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
The extra rho comes from the derevative of the unit vector e in the direction of phi.
 one year ago

TuringTestBest ResponseYou've already chosen the best response.1
ahh, okay, I had to read that sheet a but closer to get it thanks!
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
No problem, you´re welcome.
 one year ago
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