Please turn on javascript in your browser to play chess.
Posers and Puzzles

Posers and Puzzles

  1. 24 Apr '08 22:47
    Assuming a closed system and a perfect world (no wind, gravity is 9.8m/s, constant k on the slinky) would it be mathematically possible for a slinky to be released perfectly onto the escalator and move continually?

    If so what speed would the escalator have to be moving upwards?


    *Taking-- "Normal stair riser height is 7½" but may be as high as 8" provided all risers are the same height."-- to get a norm. stair height (7.5in.) and a slinky of 1.75* the stair's height.
  2. Standard member TheMaster37
    Kupikupopo!
    25 Apr '08 08:24
    Originally posted by tamuzi
    Assuming a closed system and a perfect world (no wind, gravity is 9.8m/s, constant k on the slinky) would it be mathematically possible for a slinky to be released perfectly onto the escalator and move continually?

    If so what speed would the escalator have to be moving upwards?


    *Taking-- "Normal stair riser height is 7½" but may be as high as 8" provi ...[text shortened]... e height."-- to get a norm. stair height (7.5in.) and a slinky of 1.75* the stair's height.
    I reckon the elevator would have to move downward. A slinky moves DOWN the stairs.

    If you push the slinky for the initial topple it would come to rest immedeately if the elevator is moving up.

    I've done no calculations to prove this, so I might be wrong (I tend to be wrong first before I get things right)
  3. 25 Apr '08 08:43
    I think it is possible to release a slinky, in a escalator (not an elevator), and theoretically it will slink for ever.
    But in practice, it is hard to align the speed of the escalator to the slinky's properties. Even if you do, the k of the slinky will change a little with time, thus change its position.
  4. Standard member wolfgang59
    Infidel
    25 Apr '08 11:57
    Originally posted by tamuzi
    Assuming a closed system and a perfect world (no wind, gravity is 9.8m/s, constant k on the slinky) would it be mathematically possible for a slinky to be released perfectly onto the escalator and move continually?

    If so what speed would the escalator have to be moving upwards?


    *Taking-- "Normal stair riser height is 7½" but may be as high as 8" provi ...[text shortened]... e height."-- to get a norm. stair height (7.5in.) and a slinky of 1.75* the stair's height.
    Providing that said slinky reaches a terminal velocity when descending stationary stairs then it could be put on an escalator that accelerated to that terminal velocity and slink forever.
  5. Standard member TheMaster37
    Kupikupopo!
    28 Apr '08 08:29
    Hahaha, escalator...not elevator...

    *hides in a corner*
  6. 28 Apr '08 18:45
    Originally posted by TheMaster37
    Hahaha, escalator...not elevator...

    *hides in a corner*
    What's funny with that...?
  7. 28 Apr '08 19:08
    Originally posted by FabianFnas
    What's funny with that...?
    Check his location, and you'll see.
  8. Standard member TheMaster37
    Kupikupopo!
    04 May '08 08:33
    Originally posted by FabianFnas
    What's funny with that...?
    Oh, just me reading too fast

    To quote a bit form your post:
    "in a escalator (not an elevator)"

    I read it as a subtle hint for me to read better
  9. 04 May '08 09:41
    Originally posted by TheMaster37
    Oh, just me reading too fast

    To quote a bit form your post:
    "in a escalator (not an elevator)"

    I read it as a subtle hint for me to read better
    Ah, now I see! Then I join you in the hahaha part!