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Homework Help: Gravitational Force of Particles

  1. Apr 9, 2016 #1
    1. The problem statement, all variables and given/known data
    There are three particles;
    1) 26kg at 12i-hat
    2)13kg at -5j-hat
    3)13 kg at 5j-hat

    A) What is the gravitational force on the 26kg mass due to the 13kg mass at -5j-hat

    2. Relevant equations
    F= GMm/r^2

    3. The attempt at a solution
    Y Component
    9.01E-10 j-hat
    X Component
    =1.57E-10 i-hat

    I have solved this problem before in the exact same way and gotten the correct answers. I don't know why there answers are incorrect. Could someone point it out please? Thanks.
  2. jcsd
  3. Apr 9, 2016 #2
    āˆ’1.2Eāˆ’10i-hat āˆ’5.1E-11 j-hat

    Correct answers...
  4. Apr 9, 2016 #3
    Still unsure how the attempt to solve is wrong, help please?
  5. Apr 9, 2016 #4


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    Gold Member

    Is the distance between the objects 5j, 12i, or some other number?
  6. Apr 10, 2016 #5
    Yes that's the distance!
  7. Apr 10, 2016 #6


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    No it isn't.
    If fred is 3 m in front of you and Ella is 4m to your right, how far apart are Fred and Ella?
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