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RaphaelFilgueiras Group Title

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

  • 2 years ago
  • 2 years ago

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  1. RaphaelFilgueiras Group Title
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    |dw:1348769313139:dw|

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

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

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

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

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

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

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

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

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

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

    • 2 years ago
  12. Jemurray3 Group Title
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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.

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

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

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

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

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

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

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

    • 2 years ago
  20. Jemurray3 Group Title
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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.

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

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

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

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

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

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

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

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

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

    • 2 years ago
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