1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Position Vectors

  1. Dec 9, 2015 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    Relevant equations can be derived from the formulas, by exchanging x to v, v to a, etc.

    3. The attempt at a solution
    I've tried to graph them, but I am not able to visualize or understand them.

    Please help me about these questions, I need some hints.

    If you can suggest me some parts or questions relevant to this topic, I will be so happy because I cannot understand this concept.
  2. jcsd
  3. Dec 9, 2015 #2

    the info given in qn is not correct. here angle theta cannot be between r and z axis. as in that case theta becomes 90 degree and that doesn't make sense. theta is between r vector and x-axis and in that case it is just a transformation between rectangular and polar coordinates in 2-D. Please check attachment for your help. I guess you can try qn. c and qn. d now
    . UNW4Db049XQFCPf6TAy2g9H8.jpg
  4. Dec 9, 2015 #3
    I was looking for it also, thank you for your kind reply and your work, I am trying to visualize the angle for the z axis, since there is no component for the z hat plane, it doesn't make sense thus it is 90 degrees. I agree with you, neverthless I told them this morning, but he told that there is more to think about that point. Thank you for your help, I understood your kind help correctly. Do you have any books in your mind, about the part of this classical mechanics?
  5. Dec 9, 2015 #4
    But if we neglect that z part and exchange with x hat, it is reasonable. Thank you anyway kind friend, I will be solving it as x
  6. Dec 12, 2015 #5

    See if the angle is between Z axis and r vector than definitely r hat becomes y hat and theta hat becomes (-ve) x hat. from that perspective it is a rotation of the vector by 90 deg if you transform from rectangular to the r-theta co-ordinate.

    You can follow Spiegel for concepts on Vectors and Curvilinear co ordinates.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted