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Crazy Squirrel

  1. Sep 16, 2007 #1
    1. The problem statement, all variables and given/known data

    A http://www.maniacworld.com/squirrel-obstacle-course.html has x- and y-coordinates ( 1.2 m, 3.9 m) at time t1=0 and coordinates ( 5.5 m, -0.60 m) at time t2 = 3.1 s.

    For this time interval, find the x & y component of the average velocity.
    Express your answer using two significant figures.

    3. The attempt at a solution

    This is what I did
    First I drew how I would imagine it would look like.

    Then I decided xf-xi / tf-ti = vax

    -.60 - 1.2 /3.1 = -1.8/3.1 = -.580
  2. jcsd
  3. Sep 16, 2007 #2


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    but -0.60 is y2, not x2...
  4. Sep 16, 2007 #3

    my mistake (obviously) :P

    5.5 - 1.2 /3.1 = 4.3/3.1 = 1.38
  5. Sep 16, 2007 #4


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    Yeah, that looks right. Do the same for vy. The question asks for 2 significant figures though...
  6. Sep 16, 2007 #5
    Ok I did the other questions regarding this crazy squirrel,

    but this question got me

    Find the direction of the average velocity. below the x axis.

    I graphed it.

    x com = 1.4
    y com = -1.5

    arc tan of (-1.5/1.4) = -.82

    why is this wrong.?
  7. Sep 16, 2007 #6


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    Is that in radians? Does the question ask for degrees or radians?

    Although the first parts asked for the answer in 2 significant figures... you should keep more decimal places for the next calculations...

    ie: use arctan( -1.4516/1.387)
  8. Sep 16, 2007 #7
    since it still says use two sigs

    I did what you mentioned above and I got


    so I rounded to


    still wrong.

    and yes in degrees
  9. Sep 16, 2007 #8


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    But -0.81 is in the answer in radians... do you have the calculator set up for degrees? What is the anwer in degrees?
  10. Sep 16, 2007 #9
    haha, I guess that is what I get for using my graphing calc, I forgot the last time I used it I set it up for radians. Thank you for your explation. :)
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