mayankdevnani
  • mayankdevnani
State that WORK is DONE or NOT..... A Wind-Mill is lifting water from a well. and also justify your answer..
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
schrodinger
  • schrodinger
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mayankdevnani
  • mayankdevnani
am confusing.....plz help me
anonymous
  • anonymous
for windmill work is not done and for water work is done!
mayankdevnani
  • mayankdevnani
no @VV-EFF question is one!!

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mayankdevnani
  • mayankdevnani
@sirm3d
anonymous
  • anonymous
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!
mayankdevnani
  • mayankdevnani
yaa.. i know but my teacher says the work done is zero..
anonymous
  • anonymous
she would be considering cosQ =0, then she's right
mayankdevnani
  • mayankdevnani
can you help me @ganeshie8 and @gerryliyana
mayankdevnani
  • mayankdevnani
what is this? i can't understand
anonymous
  • anonymous
workdone=FxDxcos(Q) where Q is the angle between the force F and displacement D.
anonymous
  • anonymous
the work done is zero., because windmills always return to the original point
mayankdevnani
  • mayankdevnani
how can we know that angle is of cosQ
anonymous
  • anonymous
yeah thats the point @gerryliyana ! he is considering water anf mill, both as a system!
anonymous
  • anonymous
and in case of water ! water is displaced by force!
mayankdevnani
  • mayankdevnani
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!!
anonymous
  • anonymous
nice @VV-EFF
mayankdevnani
  • mayankdevnani
so in that case...
anonymous
  • anonymous
nice What! @gerryliyana ! gve him the answer man! lol....
mayankdevnani
  • mayankdevnani
so finally whats the conclusion of this answer.
mayankdevnani
  • mayankdevnani
@Aperogalics have a look!!
anonymous
  • anonymous
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!!
mayankdevnani
  • mayankdevnani
but the answer is to be written is one
anonymous
  • anonymous
work is not done! then
mayankdevnani
  • mayankdevnani
in my solution book answer is work is done and the reason is that windmill pulls the water against the gravity...
anonymous
  • anonymous
@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........:)
anonymous
  • anonymous
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!
mayankdevnani
  • mayankdevnani
so what's the answer??
anonymous
  • anonymous
now dude stop confusing your self! the answer is that the work is certainly done by the system!
mayankdevnani
  • mayankdevnani
m really confused @Aperogalics and @VV-EFF what is the concluded answer and answer should be one means both work done or not
mayankdevnani
  • mayankdevnani
so i am correct and my teacher is wrong!!!
anonymous
  • anonymous
yeah!
anonymous
  • anonymous
work is done by the system! its certain!
mayankdevnani
  • mayankdevnani
sure...are you sure about this!!
anonymous
  • anonymous
yeah!
mayankdevnani
  • mayankdevnani
let @Aperogalics be write and then think,. he has creative mind...let @Aperogalics be answer
anonymous
  • anonymous
@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.........:)
mayankdevnani
  • mayankdevnani
no my mam says that the work be zero and i say that work is not zero @Aperogalics
anonymous
  • anonymous
lol.. what an answer @Aperogalics
anonymous
  • anonymous
@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??????????????
mayankdevnani
  • mayankdevnani
no.. my friend george said that mam says the work done is zero
mayankdevnani
  • mayankdevnani
and also 1 thing
mayankdevnani
  • mayankdevnani
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.
mayankdevnani
  • mayankdevnani
secondly, there are not more than one work done... right..
mayankdevnani
  • mayankdevnani
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
anonymous
  • anonymous
i would say that u plz read the conversation above! and conclude the answer urslf!
anonymous
  • anonymous
@mayankdevnani answer my question and you will get the answer by yourself:)
mayankdevnani
  • mayankdevnani
plz
anonymous
  • anonymous
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?
mayankdevnani
  • mayankdevnani
no work done is zero
anonymous
  • anonymous
why????????
anonymous
  • anonymous
@mayankdevnani
mayankdevnani
  • mayankdevnani
because force acts in perpendicular direction\[90^{0}\] and displacement is at right angle
mayankdevnani
  • mayankdevnani
right @Aperogalics
anonymous
  • anonymous
is the work is done against gravity?????
mayankdevnani
  • mayankdevnani
|dw:1352199535611:dw|
mayankdevnani
  • mayankdevnani
no @Aperogalics
anonymous
  • anonymous
why?????
mayankdevnani
  • mayankdevnani
why thats have no answer
anonymous
  • anonymous
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
anonymous
  • anonymous
getting it???????
anonymous
  • anonymous
@mayankdevnani
mayankdevnani
  • mayankdevnani
thnx... i get it
anonymous
  • anonymous
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:)
anonymous
  • anonymous
I will say a small thing that "pulley" is the main thing here... |dw:1352284103729:dw|
anonymous
  • anonymous
nice @SheldonEinstein
anonymous
  • anonymous
THanks @gerryliyana :)
mayankdevnani
  • mayankdevnani
@SheldonEinstein so that the work done is zeroo..you would say that
anonymous
  • anonymous
I had said that and yes Work done is ZERO! (if we are talking about a diff. kind of system)

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