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mayankdevnani

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

  • one year ago
  • one year ago

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

    • one year ago
  2. VV-EFF
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    for windmill work is not done and for water work is done!

    • one year ago
  3. mayankdevnani
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    no @VV-EFF question is one!!

    • one year ago
  4. mayankdevnani
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    @sirm3d

    • one year ago
  5. VV-EFF
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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!

    • one year ago
  6. mayankdevnani
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    yaa.. i know but my teacher says the work done is zero..

    • one year ago
  7. VV-EFF
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    she would be considering cosQ =0, then she's right

    • one year ago
  8. mayankdevnani
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    can you help me @ganeshie8 and @gerryliyana

    • one year ago
  9. mayankdevnani
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    what is this? i can't understand

    • one year ago
  10. VV-EFF
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    workdone=FxDxcos(Q) where Q is the angle between the force F and displacement D.

    • one year ago
  11. gerryliyana
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    the work done is zero., because windmills always return to the original point

    • one year ago
  12. mayankdevnani
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    how can we know that angle is of cosQ

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

    • one year ago
  14. VV-EFF
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    and in case of water ! water is displaced by force!

    • one year ago
  15. mayankdevnani
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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!!

    • one year ago
  16. gerryliyana
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    nice @VV-EFF

    • one year ago
  17. mayankdevnani
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    so in that case...

    • one year ago
  18. VV-EFF
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    nice What! @gerryliyana ! gve him the answer man! lol....

    • one year ago
  19. mayankdevnani
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    so finally whats the conclusion of this answer.

    • one year ago
  20. mayankdevnani
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    @Aperogalics have a look!!

    • one year ago
  21. VV-EFF
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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!!

    • one year ago
  22. mayankdevnani
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    but the answer is to be written is one

    • one year ago
  23. VV-EFF
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    work is not done! then

    • one year ago
  24. mayankdevnani
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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...

    • one year ago
  25. Aperogalics
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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........:)

    • one year ago
  26. VV-EFF
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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!

    • one year ago
  27. mayankdevnani
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    so what's the answer??

    • one year ago
  28. VV-EFF
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    now dude stop confusing your self! the answer is that the work is certainly done by the system!

    • one year ago
  29. mayankdevnani
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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

    • one year ago
  30. mayankdevnani
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    so i am correct and my teacher is wrong!!!

    • one year ago
  31. VV-EFF
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    yeah!

    • one year ago
  32. VV-EFF
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    work is done by the system! its certain!

    • one year ago
  33. mayankdevnani
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    sure...are you sure about this!!

    • one year ago
  34. VV-EFF
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    yeah!

    • one year ago
  35. mayankdevnani
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    let @Aperogalics be write and then think,. he has creative mind...let @Aperogalics be answer

    • one year ago
  36. Aperogalics
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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.........:)

    • one year ago
  37. mayankdevnani
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    no my mam says that the work be zero and i say that work is not zero @Aperogalics

    • one year ago
  38. VV-EFF
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    lol.. what an answer @Aperogalics

    • one year ago
  39. Aperogalics
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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??????????????

    • one year ago
  40. mayankdevnani
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    no.. my friend george said that mam says the work done is zero

    • one year ago
  41. mayankdevnani
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    and also 1 thing

    • one year ago
  42. mayankdevnani
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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.

    • one year ago
  43. mayankdevnani
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    secondly, there are not more than one work done... right..

    • one year ago
  44. mayankdevnani
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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

    • one year ago
  45. VV-EFF
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    i would say that u plz read the conversation above! and conclude the answer urslf!

    • one year ago
  46. Aperogalics
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    @mayankdevnani answer my question and you will get the answer by yourself:)

    • one year ago
  47. mayankdevnani
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    plz

    • one year ago
  48. Aperogalics
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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?

    • one year ago
  49. mayankdevnani
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    no work done is zero

    • one year ago
  50. Aperogalics
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    why????????

    • one year ago
  51. Aperogalics
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    @mayankdevnani

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

    • one year ago
  53. mayankdevnani
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    right @Aperogalics

    • one year ago
  54. Aperogalics
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    is the work is done against gravity?????

    • one year ago
  55. mayankdevnani
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    |dw:1352199535611:dw|

    • one year ago
  56. mayankdevnani
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    no @Aperogalics

    • one year ago
  57. Aperogalics
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    why?????

    • one year ago
  58. mayankdevnani
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    why thats have no answer

    • one year ago
  59. Aperogalics
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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

    • one year ago
  60. Aperogalics
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    getting it???????

    • one year ago
  61. Aperogalics
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    @mayankdevnani

    • one year ago
  62. mayankdevnani
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    thnx... i get it

    • one year ago
  63. Aperogalics
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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:)

    • one year ago
  64. SheldonEinstein
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    I will say a small thing that "pulley" is the main thing here... |dw:1352284103729:dw|

    • one year ago
  65. gerryliyana
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    nice @SheldonEinstein

    • one year ago
  66. SheldonEinstein
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    THanks @gerryliyana :)

    • one year ago
  67. mayankdevnani
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    @SheldonEinstein so that the work done is zeroo..you would say that

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

    • one year ago
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