Thanks Jeff and Andy,
I will now put the actual problem which prompted me to clear up the above confusion. Please refer to fig. "piston2.bmp". In both the cases, equal columns of water are on either side of the piston with unequal working areas. In Case 1, the connection is rigid while in...
Please consider a U-tube filled with an incompressible fluid as in the attached figure. Piston P divides the fluid in two segments. When P moves, the fluid particles on immediate vicinity of either face (points marked 1 and 2) will have same velocity.
Does this mean, they may considered to be...