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mayankdevnani

  • 2 years ago

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

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  1. mayankdevnani
    • 2 years ago
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    am confusing.....plz help me

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

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

  4. mayankdevnani
    • 2 years ago
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    @sirm3d

  5. VV-EFF
    • 2 years ago
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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!

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

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

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

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

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

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

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

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

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

  15. mayankdevnani
    • 2 years ago
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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!!

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

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

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

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

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

  21. VV-EFF
    • 2 years ago
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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!!

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

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

  24. mayankdevnani
    • 2 years ago
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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...

  25. Aperogalics
    • 2 years ago
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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........:)

  26. VV-EFF
    • 2 years ago
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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!

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

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

  29. mayankdevnani
    • 2 years ago
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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

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

  31. VV-EFF
    • 2 years ago
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    yeah!

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

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

  34. VV-EFF
    • 2 years ago
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    yeah!

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

  36. Aperogalics
    • 2 years ago
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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.........:)

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

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

  39. Aperogalics
    • 2 years ago
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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??????????????

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

  41. mayankdevnani
    • 2 years ago
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    and also 1 thing

  42. mayankdevnani
    • 2 years ago
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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.

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

  44. mayankdevnani
    • 2 years ago
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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

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

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

  47. mayankdevnani
    • 2 years ago
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    plz

  48. Aperogalics
    • 2 years ago
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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?

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

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

  51. Aperogalics
    • 2 years ago
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    @mayankdevnani

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

  53. mayankdevnani
    • 2 years ago
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    right @Aperogalics

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

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

  56. mayankdevnani
    • 2 years ago
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    no @Aperogalics

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

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

  59. Aperogalics
    • 2 years ago
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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

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

  61. Aperogalics
    • 2 years ago
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    @mayankdevnani

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

  63. Aperogalics
    • 2 years ago
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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:)

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

  65. gerryliyana
    • 2 years ago
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    nice @SheldonEinstein

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

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

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

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