Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

TomLikesPhysics Group Title

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

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. TuringTest Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    w is omega?

    • 2 years ago
  2. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes

    • 2 years ago
  3. TuringTest Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I can't see how it is anything other than just differentiating wrt t

    • 2 years ago
  4. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 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)

    • 2 years ago
  5. TuringTest Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so the directions here are\[\hat r,\hat\theta,\hat z\]I suppose, eh?

    • 2 years ago
  6. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    right

    • 2 years ago
  7. TuringTest Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    do you know the answer?

    • 2 years ago
  8. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    No, however I just computed v(t)=(2, 2t*w, 4) but I don´t know if is correct or not.

    • 2 years ago
  9. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I also have no clue how I could ask wolfram alpha to check that.

    • 2 years ago
  10. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I used this formula but I am not entirely sure if this formula fits that problem.

    • 2 years ago
    1 Attachment
  11. TuringTest Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I have never seen that formula, so I can't verify it...

    • 2 years ago
  12. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I thought this is a "simple" problem.^^

    • 2 years ago
  13. TuringTest Group Title
    Best Response
    You've already chosen the best response.
    Medals 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

    • 2 years ago
  14. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    The extra rho comes from the derevative of the unit vector e in the direction of phi.

    • 2 years ago
  15. TuringTest Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ahh, okay, I had to read that sheet a but closer to get it thanks!

    • 2 years ago
  16. TomLikesPhysics Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    No problem, you´re welcome.

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.