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Rail way car acceleration problem

  1. Mar 26, 2007 #1

    raman911

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    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
     
    raman911, Mar 26, 2007
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  3. Mar 26, 2007 #2

    raman911

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    help plzzzzzzzzzz
     
    raman911, Mar 26, 2007
  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.
     
    PhanthomJay, Mar 26, 2007
  5. Mar 26, 2007 #4

    raman911

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    i am not understandig that problem
    how can i show u work
     
    raman911, Mar 26, 2007
  6. Mar 26, 2007 #5

    PhanthomJay

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    Can you write down Newton's 2nd law?
     
    PhanthomJay, Mar 26, 2007
  7. Mar 26, 2007 #6

    raman911

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    Fnet=ma
    .................
     
    raman911, Mar 26, 2007
  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?
     
    PhanthomJay, Mar 26, 2007
  9. Mar 26, 2007 #8

    raman911

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    can u do that
    i don't understand
     
    raman911, Mar 26, 2007
  10. Mar 26, 2007 #9

    a9211l

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    If F=ma, and you have a total mass and an acceleration.... then I'm pretty sure you can solve for F.
     
    a9211l, Mar 26, 2007
  11. Mar 27, 2007 #10

    xiankai

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    Fnet = menginea1 + 6mcara1

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

    Fnet = menginea2 + 4mCARa2
     
    xiankai, Mar 27, 2007
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