Notices
Results 1 to 4 of 4

Thread: what the heck energy destroyed  ?

  1. #1 what the heck energy destroyed  ? 
    Suspended
    Join Date
    Jun 2009
    Posts
    893
    all right you have a rounded long beam that can rotate:

    in the left theres one cable wrapped around the beam holding 1kg weight

    in the right theres identical set up but thanks to a groove on the beam the cable is wrapped in an helix

    what will happen here?

    the torque exerced by both weights are oposite and equal since weights are equal and arms are equal

    now you rotate the beam with 0 effort since both equal torques are oposite

    one weight, the one normally wrapped, rises 10 cm

    the helix one wrapped lowers one m

    the system has produce not energy yet spent potential one

    energy has been destroyed

    now can somebody throw some light on this before i go crazier?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Freshman spirytus's Avatar
    Join Date
    Dec 2006
    Posts
    44
    A picture is worth a thousand words.


    There are 10 types of people; those who understand binary, and those who don't.
    Reply With Quote  
     

  4. #3  
    Suspended
    Join Date
    Jun 2009
    Posts
    893
    Reply With Quote  
     

  5. #4  
    sox
    sox is offline
    Forum Masters Degree sox's Avatar
    Join Date
    Sep 2008
    Location
    Uk - Scotland
    Posts
    598
    A good picture is worth a thousand words!

    __________________________________________________ _____________
    "Happy is the man who can recognise in the work of To-day a connected portion of the work of life, and an embodiment of the work of Eternity. The foundations of his confidence are unchangeable, for he has been made a partaker of Infinity." - James Clerk Maxwell
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •