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RaphaelFilgueiras

  • 2 years ago

cool question.An helium ballon is fixed in a wagon floor with a massless thread,the wangon is completely closed.The thread stay in vertical position while train moves with contant velocity.If the train is accelarated forward ,we can say,in relation to the the train the ballon will: a)move back and the tension in thread will increase b)move back and the tension in thread not change c)move forward and the tension in thread increase d)move forward and the tension in thread not change e)remains in vertical position

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  1. RaphaelFilgueiras
    • 2 years ago
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    |dw:1348769313139:dw|

  2. Jemurray3
    • 2 years ago
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    I'm not sure where traction fits in to this...

  3. Algebraic!
    • 2 years ago
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    think he means Tension.

  4. Jemurray3
    • 2 years ago
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    Oh, I see. Well, what are your thoughts?

  5. RaphaelFilgueiras
    • 2 years ago
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    it's tension like @Algebraic! said

  6. Algebraic!
    • 2 years ago
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    my thoughts are too despicable to be aired in this forum.

  7. Jemurray3
    • 2 years ago
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    @RaphaelFilgueiras Do you think it goes forward or backward?

  8. experimentX
    • 2 years ago
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    |dw:1348770606550:dw|

  9. RaphaelFilgueiras
    • 2 years ago
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    @Jemurray3 i know the answer

  10. Jemurray3
    • 2 years ago
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    Oh, okay :) And @experimentX consider the acceleration as a gravitational field pointing towards the back of the car.

  11. experimentX
    • 2 years ago
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    I was thinking that the baloon will experience backward with respect to the frame.|dw:1348770823195:dw|

  12. Jemurray3
    • 2 years ago
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    Not quite. The air inside the car feels that acceleration too, and because it is heavier than the helium inside the balloon, the balloon actually feels a force toward the front.

  13. Algebraic!
    • 2 years ago
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    |dw:1348770974869:dw|

  14. experimentX
    • 2 years ago
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    Woops ... never considered that fact.

  15. Jemurray3
    • 2 years ago
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    @Algebraic! that is true except the balloon goes to the front, not the back.

  16. experimentX
    • 2 years ago
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    Clever problem indeed!!

  17. RaphaelFilgueiras
    • 2 years ago
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    the answer is c)

  18. Algebraic!
    • 2 years ago
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    hmm, how?

  19. RaphaelFilgueiras
    • 2 years ago
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    |dw:1348771067476:dw|

  20. Jemurray3
    • 2 years ago
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    Walter Lewin actually does a demonstration of this effect in his 8.01 course, if you want to see it for yourself.

  21. Algebraic!
    • 2 years ago
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    I think I remember seeing it, actually. I just don't remember the logic.

  22. RaphaelFilgueiras
    • 2 years ago
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    the ballon will suffer a aparent g in gap direction

  23. experimentX
    • 2 years ago
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    |dw:1348771165934:dw|

  24. RaphaelFilgueiras
    • 2 years ago
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    |dw:1348771181320:dw|

  25. RaphaelFilgueiras
    • 2 years ago
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    the buyont force will be in same direction of gap

  26. experimentX
    • 2 years ago
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    helium is tricky gas. should have noted.

  27. Algebraic!
    • 2 years ago
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    pressure differential. well, I feel dumb. http://www.youtube.com/watch?v=Vi8t0x6zZNY&feature=player_detailpage#t=1524s

  28. experimentX
    • 2 years ago
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    haven't taken this course yet. is it first year mechanics?

  29. Algebraic!
    • 2 years ago
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    It's not calc. based year one physics?

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