1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    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!

Tangent line to a particles path at a specific time?

  1. Sep 27, 2005 #1
    how do you find orientation of a line that is tangent to the particle's path at t = 2.10 s?(from the +x axis)
    before this i found the position r of a particle moving in an xy plane is given by r = (1.00t3 - 8.00t) i + (7.00 - 4.00t4) j.
    So I found r,v,a, for t=2.10s (all in m)
    r=-7.54 i +-70.8 j
    v=5.23 i + -148 j
    a=12.6 i + -212 j
    i first tried using v's i and j to make a triangle and find the angle from that by inverse tan (-148/5.23) and got -87degress or -212 but that was wrong...
    any help?
  2. jcsd
  3. Sep 27, 2005 #2
    i got 272 degree from the + x axis in anticlockwise direction.
  4. Sep 27, 2005 #3
    how did u get that?
    did you just do the inverse tan and adding to 360? does that make sense?
  5. Sep 27, 2005 #4
    your v lies in the fourth quadrant.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Tangent line to a particles path at a specific time?
  1. Tangent line (Replies: 3)

  2. Tangent Line (Replies: 13)

  3. Tangent Lines (Replies: 2)

  4. Tangent Lines (Replies: 2)