XPost: sci.space.policy, sci.physics   
   From: invalid@invalid.com   
      
   On 6/23/2018 2:39 AM, JF Mezei wrote:   
   > On 2018-06-22 19:58, Alain Fournier wrote:   
   >   
   >> In both cases, when the fishing line or the elevator cable snaps the   
   >> elasticity pulls back with more force than the gravity or centrifugal   
   >> force.   
   >   
   > Centrifugal force is equal to gravity at genostationary orbit for this   
   > setup. below that, gravity is bigger so it pulls cable down.   
      
   nope.   
   The orbiting object just needs to orbit faster to stay at the same   
   height above the earth, and it does not go down.   
      
   >   
   > But what your argument does not consider is that the cable at   
   > geostationary is travelling at roughly 9370 km/h.  But throughout the   
   > cable, all portions have the same radial speed (15° per hour, 360° per   
   > 24 hours).   
      
   the cable will bend under these conditions if very long.  as the top   
   part is going too fast to be geostationary, and the bottom is going too   
   slow to be geostationary for the cable to remain normal to the Earths   
   surface.   Short cable is ok, but not a 10,000 km one.   
      
      
   >   
   > As the topmost portion of the cable is pulled down, its speed increases   
   > and it now has a radial speed greater than 15° per hour.   
   >   
   >   
   > The lower end will pull cable down (gravity) and resist beiong pulled   
   > forward (either because still anchored or being dragged on ground   
   > (resistance).   
   >   
   > The higher end will respond to being pulled down by increasing forward   
   > velocity, thus tugging on cable to move horizontally.  Those two forces   
   > should keep cable fully extended and straight. It won't be snaking around.   
   >   
   > Any elasticity in the cable means that when the initial break at   
   > geostationaly happens, the elasticity will pull cable down more than   
   > just gravity.  But that extra force will also result in the top most   
   > portion accelerating horizontally.  So it isn't clear that as the   
   > tension is released, the cable would "snake".   
   >   
   >   
   >   
      
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