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Homework Help: Forces: acceleration with a sun yacht

  1. Mar 13, 2008 #1
    [SOLVED]Forces: acceleration with a sun yacht

    1. The problem statement, all variables and given/known data
    Sunjamming. A “sun yacht” is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances, it can be large enough to send the spacecraft outward from the Sun on a cost-free but slow trip. Suppose that the spacecraft has a mass of 700 kg and receives a push of 18 N. (a) What is the magnitude of the resulting acceleration? If the craft starts from rest, (b) how far will it travel in 1 day and (c) how fast will it then be moving?


    2. Relevant equations
    F=Ma
    V=ma


    3. The attempt at a solution
    I think part a is correct, part b i am lost on, and part c just doesnt seem to make sense, it seems too fast
    a) a= 18/700= .025 m/s^2


    c) 700x.025=17.5 m/s?
     
    Last edited: Mar 13, 2008
  2. jcsd
  3. Mar 13, 2008 #2

    Dick

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    Science Advisor
    Homework Helper

    Where did you get V=ma????? Part a) is ok, But to find a velocity after one day you want to find a relation between acceleration time and velocity. For b) you want a relation between acceleration time and distance. They are just kinematic equations. Like v(t)=v(0)+a*t.
     
  4. Mar 13, 2008 #3
    its still not making sense to me, probably because i dont have the kinematics equations
     
  5. Mar 13, 2008 #4
    actually nvm i got it, thanks for the help
     
  6. Mar 13, 2008 #5
    t= 86400 seconds
    V(o)tx(1/2)at
    9331200 m

    V=0+(at)

    2160m/s
     
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