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Homework Help: What is the magnitude and difrection of the acceleration?

  1. May 23, 2013 #1
    1. three forces act on a 5kg mass. the forces are 20n north, 30n west, 45n east. what is the magnitude and direction of the acceleration?

    - how do I set this up? i am kinda lost on thsi one.

    2. what is the gravitational force between a 100 kg object and a 200kg object if centers of mass are 10m apart. g= 6x10^-11 N m^2//kg^2

    - this one too.. i don't know how i set this up.

    3. describe the forces in terms of newton's 3rd law that propel a rocket?

    - what is this mean? i know newton's 3rd law is for every action there is an equal and opposite reaction but what is this question asking?

    4. under a balanced force there A) no change in translational motion B) No rotational motion C) no inertia D) all of above

    - I am guessing it's C?

    Any help would be greatly appreciated. It's not like I didn't try. None of this problems were done in class and I can't find similar examples either. :(
  2. jcsd
  3. May 23, 2013 #2
    1. Calculate the x and y-components of each force. Then add all the x-components together. Do the same for the y-components. You will then have the components of the resultant force. From which you can calculate the acceleration in each of these directions using Newton's 2nd law.
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