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RaphaelFilgueiras

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

  • one year ago
  • one year ago

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  1. RaphaelFilgueiras
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    |dw:1348769313139:dw|

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

    • one year ago
  3. Algebraic!
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    think he means Tension.

    • one year ago
  4. Jemurray3
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    Oh, I see. Well, what are your thoughts?

    • one year ago
  5. RaphaelFilgueiras
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    it's tension like @Algebraic! said

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

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

    • one year ago
  8. experimentX
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    |dw:1348770606550:dw|

    • one year ago
  9. RaphaelFilgueiras
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    @Jemurray3 i know the answer

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

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

    • one year ago
  12. Jemurray3
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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.

    • one year ago
  13. Algebraic!
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    |dw:1348770974869:dw|

    • one year ago
  14. experimentX
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    Woops ... never considered that fact.

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

    • one year ago
  16. experimentX
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    Clever problem indeed!!

    • one year ago
  17. RaphaelFilgueiras
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    the answer is c)

    • one year ago
  18. Algebraic!
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    hmm, how?

    • one year ago
  19. RaphaelFilgueiras
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    |dw:1348771067476:dw|

    • one year ago
  20. Jemurray3
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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.

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

    • one year ago
  22. RaphaelFilgueiras
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    the ballon will suffer a aparent g in gap direction

    • one year ago
  23. experimentX
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    |dw:1348771165934:dw|

    • one year ago
  24. RaphaelFilgueiras
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    |dw:1348771181320:dw|

    • one year ago
  25. RaphaelFilgueiras
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    the buyont force will be in same direction of gap

    • one year ago
  26. experimentX
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    helium is tricky gas. should have noted.

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

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

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

    • one year ago
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