http://3.bp.blogspot.com/-d-P219mnzkM/VA7NfcUiroI/AAAAAAAAB9g/q_NJrbt4UfM/s1600/CIMG3315.JPG
300 km/s respect to Earth = 330 or 270 km/s respect to Sun
how big foce will register table's leg ?
Symetry ? respect to what mass m is pushing pipe's wall ( how big friction left/right mass )...