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!

Superposition of Forces: Finding Magnitude and Direction

  1. Aug 22, 2012 #1
    1. The problem statement, all variables and given/known data
    http://imgur.com/fvNbE
    Part a needs to have up to 2 significant figures.
    For part b. you need to find theta or the degrees counter clockwise from +x direction.


    2. Relevant equations
    Coulombs Law:
    F = 9(10^9) |q1q2|/r^2
    r = distance in meters of two charges


    3. The attempt at a solution
    Part A.
    F(Q on q1) = 9(10^9) N*m^2/C^2 * (2*10^-6 C)(4*10^-6 C) / (0.5m)^2
    = 0.288 N

    F(q2 on q1) = 9(10^9) N*m^2/C^2 * (2*10^-6)^2 / (0.60m)^2
    = 0.1 N

    |F| = sqroot( (0.288 N)^2 + (0.1 N)^2 ) = 0.304867 N *I know this is wrong because I tried to submit this answer and it was no go.*


    Part B.
    atan(0.1 N/0.288 N) = 19.148 degress
    180 - 19.148 = 160.852 degress
    *For this part I figured I take 180 and subtract the degrees obtained to get the degrees counter clockwise of the +x direction.
     
  2. jcsd
  3. Aug 22, 2012 #2
     
    Last edited by a moderator: May 6, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Superposition of Forces: Finding Magnitude and Direction
Loading...