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Rail way car acceleration problem

  1. Mar 26, 2007 #1
    The engine of a train has mass of 5*10^4kg. It can accelerate six rail way cars having a total mass of 3*10^5kg at 0.40m/s^2. What acceleration can it give four railway cars having a total mass of 2*10^5kg?
    i don't know what to do?
    plz help
     
  2. jcsd
  3. Mar 26, 2007 #2
    help plzzzzzzzzzz
     
  4. Mar 26, 2007 #3

    PhanthomJay

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    you should start by showing us what you know about Newton's 2nd law and how you might apply it to solve this problem.
     
  5. Mar 26, 2007 #4
    i am not understandig that problem
    how can i show u work
     
  6. Mar 26, 2007 #5

    PhanthomJay

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    Can you write down Newton's 2nd law?
     
  7. Mar 26, 2007 #6
    Fnet=ma
    .................
     
  8. Mar 26, 2007 #7

    PhanthomJay

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    Yes, correct. Now in the problem statement, you are given the acceleration and the mass of the engine and the and 6 cars. Can you solve for Fnet?
     
  9. Mar 26, 2007 #8
    can u do that
    i don't understand
     
  10. Mar 26, 2007 #9
    If F=ma, and you have a total mass and an acceleration.... then I'm pretty sure you can solve for F.
     
  11. Mar 27, 2007 #10
    Fnet = menginea1 + 6mcara1

    now since the pulling power of the engine (the force it can exert) is assumed to be constant,

    Fnet = menginea2 + 4mCARa2
     
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