anonymous
  • anonymous
A potter moving vertically up the stairs with a suitcase on his head does work . why ?
Physics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
try it by ur own...I'll help u
anonymous
  • anonymous
but i dont know and that is why i asked this question , give me the hints :)
anonymous
  • anonymous
and if you dunt mind can you teach me all types of questions like dis ?

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anonymous
  • anonymous
1st make a block of mass m as I did in last question...
anonymous
  • anonymous
|dw:1348895105918:dw|
anonymous
  • anonymous
and coolie is holding it on his head...right?
anonymous
  • anonymous
yes right !
anonymous
  • anonymous
now u have to tell...who or what is exerting force on this load?
anonymous
  • anonymous
1st earth is pulling towards its center by force mg..right?
anonymous
  • anonymous
N
anonymous
  • anonymous
YES
anonymous
  • anonymous
|dw:1348895307961:dw|
anonymous
  • anonymous
and u have to find out..work done by the potter?
anonymous
  • anonymous
and the potter is exerting a force N on the load and the direction of force is vertically upward.
anonymous
  • anonymous
again work done by potter= Force. displacement = N *( displacement) * cos(theta)
anonymous
  • anonymous
vertical so cos 0 = 1
anonymous
  • anonymous
now this time u have to tell the value of theta if potter is moving vertically up
anonymous
  • anonymous
yes...perfectly right...:)
anonymous
  • anonymous
so potter has done some work...because work done is not equal to zero
anonymous
  • anonymous
yeah , okay ty :D
anonymous
  • anonymous
:)

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