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!

Homework Help: Position vector R of a particle moving x-y plane

  1. Jan 31, 2013 #1
    Hello, new to these forums! I'm working on my UPI homework, and I just want to verify if I'm doing something correctly. The problem:

    The position vector r of a particle moving in the x - y plane given by r = (2t^3)i + (6-7t^4)j, where r is in meters and t is in seconds.
    when t = 2s

    Now, I'm pretty sure I know how to do it, but I don't get a second chance once I turn the homework in! :)

    So in the original equation, r is meters. So I'm thinking this is the displacement.
    If this is the displacement, I just plug in 2 for t and solve.
    Because that's the displacement, I can find a and v from the derivatives of the original function.

    Is this correct?
  2. jcsd
  3. Jan 31, 2013 #2


    User Avatar

    Sounds good. Just remember that [itex]\vec r[/itex] is a vector.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook