The disturbance, and B a point in the undisturbed part.
Let A be a point in the disturbance and B a point in the undisturbed portion.
The flakes drifted directly down, undisturbed in their descent by any hint of a breeze in the still night air.
Since 1894 the country has been practically undisturbed, and large numbers of Kachins are enlisted, and ready to enlist in the military police, and seem likely to form as good troops as the Gurkhas of Nepal.
If P is the undisturbed pressure and P+w the pressure at AB, the momentum entering through AB per second isJ01(P+w-+pu2)dt.