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: Sinple kinematics problem

  1. Sep 10, 2016 #1
    1. The problem statement, all variables and given/known data
    Q; In an electron gun of television set, an electron with initial speed of 10^3m/s enters a region where it is electrically accelerated. It emerges out of this region after 1micro sec with speed of 4×10^5 m/s.

    (a) Find the acceleration.
    2. Relevant equations
    vf= vi+at



    3. The attempt at a solution
    vf = vi+at
    400000= 1000+a*0.000001
    400000-1000= a*0.000001
    399000=a*0.000001
    399000/0.000001= a
    3.99×10^11= a
    a= 3.99×10^11


    The ans in book is 3.99×10^9

    Which ans is right ?
    Any help would be appreciated :-) :-D ,
    Thank you
     
  2. jcsd
  3. Sep 10, 2016 #2
    ##4.10^5=10^3+a.10^{-6}##
    Your ans is right
     
  4. Sep 10, 2016 #3
    My ans is right !!
    That means book has a mistake,
    Thanks
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Loading...