1. Not finding help here? Sign up for a free 30min 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!

Interval notation and specifying units (v vs. t graph)

  1. Aug 30, 2011 #1
    1. The problem statement, all variables and given/known data

    #5 and #6 of the attached pdf on page 5 (graph on page 4 relates to said problems)

    Note: The professor did not cover how to do a problem like this, and the book does not have a similar problem, nor any other handouts. This definitely was a unique question.

    I'm unsure if I should list the units or not within the interval notation.
    I can't find a single justification on the web whether or not do such.

    2. Relevant equations

    Should I be putting all of #5 and #6 in interval notation? How so?
    What would be a proper way to word it?

    3. The attempt at a solution

    #5 Answer?
    (45, 87.5)

    #6 Answer?
    [0, 45)U(87.5, 100]

    Right?

    Say that I want to express the time interval during which a particle is moving to the right.
    Time is in seconds...

    At 0 and between 45 seconds, the particle is moving to the right.
    AND
    Between 87.5 seconds and 100 seconds, the particle is moving to the right.

    Or would I list [0 s, 45 s)U(87.5 s, 100 s]

    Basically, this has to do with a physics problem.
    Moving to the right means the particle is moving in a positive direction.
    There are other times during which it moves in a negative direction (left); that occurs between 45 seconds and 87.5 seconds.
    At t = 45s and t=87.5s, y=0
     

    Attached Files:

    Last edited: Aug 30, 2011
  2. jcsd
  3. Aug 30, 2011 #2

    PeterO

    User Avatar
    Homework Helper

    I am happy with the way you gave your answers - or were you merely quoting the answers section of the file to show us what it should have been?

    There is always 0 <= t < 45 especially if you can type one of those snappy "less than or equal to" signs. Very easy with a pen and paper.
     
  4. Aug 30, 2011 #3
    Are you happy with the "s" unit measurement being involved with the interval notation?

    No, I was not quoting. I don't have the answers.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook