09.35: A piece of an ideal fluid is marked as it m
id yvr, bf0m59oves along a horizontal streamline through a pip
,d9y mb0r5 vife, as shown in the figure. In Region I, the speed of the fluid on the streamline is V. The cylindrical, horizontal pipe narrows so that the radius of the pipe in Region II is half of what it was in Region I. What is the speed of the marked fluid when it is in Region II?