1. The problem statement, all variables and given/known data The inside diameters of the larger portions of the horizontal pipe in Figure P9.40 are 2.80 cm. Water flows to the right at a rate of 2.00 10-4 m3/s. Determine the inside diameter of the constriction. Answer in (cm) Here is the picture http://www.webassign.net/sf5/p9_40.gif Could you guys please show me how to do this? Not just the answer I want to be able to grasp the concept. Thanks 2. Relevant equations I'd Assume 1/2pv^2 + pgy = 1/2 pv^2 + pgy Has something to do with it, but I don't really know where to start. 3. The attempt at a solution Honestly I have no idea where to start. How does the info given relate to anything? From the above equation I can get 1/2(1000)(2e-4)^2 + 1000 *9.8*.1?= 1/2 1000 (2e-4)^2? + 1000 *9.8* .25? But this doesnt use a lot of the info. Any help would be appreciated.