Quote:
Originally Posted by bojan
Hmmm
So, each piston sits in it's own cylinder and everything is connected with manifold to the same pump... and they are not connected otherwise (like on a same crank-shaft ?
The relative load on each piston is 1, 10, 100x.
Intuitively, one would think that the largest piston would start move because the force on it's head is the largest..
If we assume there is not friction between pistons and cylinders, all the pistons should start to move simultaneously...
If we take into account the friction, then we have an area between cylinders and pistons which is causing the friction, and the relative sizes of that area is proportional to the product of lengths of the piston (assumed the same for all of them) and circumference of said piston.. which will be proportional to the SQRT of piston head area.
So I think the biggest piston will start to move first, because the relative friction of the widest piston is lowest.
And, yes, the Moon rotates, one rot per ~27 days.
Where that axis is.. it is actually passing through the gravity center of Earth-Moon system.. I think Andrew is spot on here :-)
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All pistons would require 10psi to get their respective loads to move. Negate the friction from the seals and the pistons should move at the same time, but apparently they don't.