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mayankdevnani Group Title

State that WORK is DONE or NOT..... A Wind-Mill is lifting water from a well. and also justify your answer..

  • 2 years ago
  • 2 years ago

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  1. mayankdevnani Group Title
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    am confusing.....plz help me

    • 2 years ago
  2. VV-EFF Group Title
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    for windmill work is not done and for water work is done!

    • 2 years ago
  3. mayankdevnani Group Title
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    no @VV-EFF question is one!!

    • 2 years ago
  4. mayankdevnani Group Title
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    @sirm3d

    • 2 years ago
  5. VV-EFF Group Title
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    work is done then! because windmill is applying force to pull up the water and the water itself displaces! now it depends on the angle between the force applied by the mill and the direction of water!

    • 2 years ago
  6. mayankdevnani Group Title
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    yaa.. i know but my teacher says the work done is zero..

    • 2 years ago
  7. VV-EFF Group Title
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    she would be considering cosQ =0, then she's right

    • 2 years ago
  8. mayankdevnani Group Title
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    can you help me @ganeshie8 and @gerryliyana

    • 2 years ago
  9. mayankdevnani Group Title
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    what is this? i can't understand

    • 2 years ago
  10. VV-EFF Group Title
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    workdone=FxDxcos(Q) where Q is the angle between the force F and displacement D.

    • 2 years ago
  11. gerryliyana Group Title
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    the work done is zero., because windmills always return to the original point

    • 2 years ago
  12. mayankdevnani Group Title
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    how can we know that angle is of cosQ

    • 2 years ago
  13. VV-EFF Group Title
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    yeah thats the point @gerryliyana ! he is considering water anf mill, both as a system!

    • 2 years ago
  14. VV-EFF Group Title
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    and in case of water ! water is displaced by force!

    • 2 years ago
  15. mayankdevnani Group Title
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    work is done then! because windmill is applying force to pull up the water and the water itself displaces! now it depends on the angle between the force applied by the mill and the direction of water! @gerryliyana in this case!!

    • 2 years ago
  16. gerryliyana Group Title
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    nice @VV-EFF

    • 2 years ago
  17. mayankdevnani Group Title
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    so in that case...

    • 2 years ago
  18. VV-EFF Group Title
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    nice What! @gerryliyana ! gve him the answer man! lol....

    • 2 years ago
  19. mayankdevnani Group Title
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    so finally whats the conclusion of this answer.

    • 2 years ago
  20. mayankdevnani Group Title
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    @Aperogalics have a look!!

    • 2 years ago
  21. VV-EFF Group Title
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    the conclusion is that if u are considering the both as a system then the work is done ; iff Q is not equals to 1.5707. and if the system is only the mill then the work is said to be not done!!

    • 2 years ago
  22. mayankdevnani Group Title
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    but the answer is to be written is one

    • 2 years ago
  23. VV-EFF Group Title
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    work is not done! then

    • 2 years ago
  24. mayankdevnani Group Title
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    in my solution book answer is work is done and the reason is that windmill pulls the water against the gravity...

    • 2 years ago
  25. Aperogalics Group Title
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    @mayankdevnani there are two thing work done by the system and work done on the system here if the system is windmill then work done by the system is zero as there is no net dispacement while work done by the system is +ve as he make the water to be displaced........:)

    • 2 years ago
  26. VV-EFF Group Title
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    obviously !!!!! @mayankdevnani if its against the gravity the according to the equation F=ma , water has mass and the acceleration is .9.8 mLsecsquare! then the force definitely exists ! and so the workdone!

    • 2 years ago
  27. mayankdevnani Group Title
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    so what's the answer??

    • 2 years ago
  28. VV-EFF Group Title
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    now dude stop confusing your self! the answer is that the work is certainly done by the system!

    • 2 years ago
  29. mayankdevnani Group Title
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    m really confused @Aperogalics and @VV-EFF what is the concluded answer and answer should be one means both work done or not

    • 2 years ago
  30. mayankdevnani Group Title
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    so i am correct and my teacher is wrong!!!

    • 2 years ago
  31. VV-EFF Group Title
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    yeah!

    • 2 years ago
  32. VV-EFF Group Title
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    work is done by the system! its certain!

    • 2 years ago
  33. mayankdevnani Group Title
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    sure...are you sure about this!!

    • 2 years ago
  34. VV-EFF Group Title
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    yeah!

    • 2 years ago
  35. mayankdevnani Group Title
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    let @Aperogalics be write and then think,. he has creative mind...let @Aperogalics be answer

    • 2 years ago
  36. Aperogalics Group Title
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    @mayankdevnani @VV-EFF is very clever he is still saying work is done by the system if ur mam is talking about work done on the system then she is correct and if not then you are correct.........:)

    • 2 years ago
  37. mayankdevnani Group Title
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    no my mam says that the work be zero and i say that work is not zero @Aperogalics

    • 2 years ago
  38. VV-EFF Group Title
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    lol.. what an answer @Aperogalics

    • 2 years ago
  39. Aperogalics Group Title
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    @mayankdevnani yes ur mam says work is zero but is it by the system or on the system??????????? do you know about which she was talking about??????????????

    • 2 years ago
  40. mayankdevnani Group Title
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    no.. my friend george said that mam says the work done is zero

    • 2 years ago
  41. mayankdevnani Group Title
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    and also 1 thing

    • 2 years ago
  42. mayankdevnani Group Title
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    my senior friend also says that _____ "lifting water" is the work that is done. When anything is lifted - it is moved (displaced) upward against the force of gravity. The force that lifts the object (water) must be greater that that of gravity or the object won't displace upward. The Net force that acts upward to lift (object, water, etc) multiplied by the vertical lift height is defined to be the work done in this process.

    • 2 years ago
  43. mayankdevnani Group Title
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    secondly, there are not more than one work done... right..

    • 2 years ago
  44. mayankdevnani Group Title
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    lastly , what's the concluded answer suppose you are in examination hall and you have a pen and this question ...how would you solve it? @Aperogalics and @VV-EFF

    • 2 years ago
  45. VV-EFF Group Title
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    i would say that u plz read the conversation above! and conclude the answer urslf!

    • 2 years ago
  46. Aperogalics Group Title
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    @mayankdevnani answer my question and you will get the answer by yourself:)

    • 2 years ago
  47. mayankdevnani Group Title
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    plz

    • 2 years ago
  48. Aperogalics Group Title
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    a basic question in every book suppose a man lifts a box to his head and walk 40kms . IS THE WORK DONE BY THE PERSON?

    • 2 years ago
  49. mayankdevnani Group Title
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    no work done is zero

    • 2 years ago
  50. Aperogalics Group Title
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    why????????

    • 2 years ago
  51. Aperogalics Group Title
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    @mayankdevnani

    • 2 years ago
  52. mayankdevnani Group Title
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    because force acts in perpendicular direction\[90^{0}\] and displacement is at right angle

    • 2 years ago
  53. mayankdevnani Group Title
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    right @Aperogalics

    • 2 years ago
  54. Aperogalics Group Title
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    is the work is done against gravity?????

    • 2 years ago
  55. mayankdevnani Group Title
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    |dw:1352199535611:dw|

    • 2 years ago
  56. mayankdevnani Group Title
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    no @Aperogalics

    • 2 years ago
  57. Aperogalics Group Title
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    why?????

    • 2 years ago
  58. mayankdevnani Group Title
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    why thats have no answer

    • 2 years ago
  59. Aperogalics Group Title
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    yes that's the thing force is applied against gravity and displacement is zero here|dw:1352199714164:dw| there displacement is in perpendicular direction and here no displacement

    • 2 years ago
  60. Aperogalics Group Title
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    getting it???????

    • 2 years ago
  61. Aperogalics Group Title
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    @mayankdevnani

    • 2 years ago
  62. mayankdevnani Group Title
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    thnx... i get it

    • 2 years ago
  63. Aperogalics Group Title
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    always for you help here i asked 2 different question bith r work but done by different systems.....k:) so if the question is of IIT then it will mention the system otherwise my first post is the answer:)

    • 2 years ago
  64. SheldonEinstein Group Title
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    I will say a small thing that "pulley" is the main thing here... |dw:1352284103729:dw|

    • 2 years ago
  65. gerryliyana Group Title
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    nice @SheldonEinstein

    • 2 years ago
  66. SheldonEinstein Group Title
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    THanks @gerryliyana :)

    • 2 years ago
  67. mayankdevnani Group Title
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    @SheldonEinstein so that the work done is zeroo..you would say that

    • 2 years ago
  68. SheldonEinstein Group Title
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    I had said that and yes Work done is ZERO! (if we are talking about a diff. kind of system)

    • 2 years ago
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