1. The problem statement, all variables and given/known data The pressure in a section of horizontal pipe with a diameter of 2.0 cm is 140 kPa. Water flows through the pipe at 2.80 L/s. Assume laminar nonviscous flow. If the pressure at a certain point is to be reduced to 102 kPa by constricting a section of the pipe, what should the diameter of the constricted section be in cm? 2. Relevant equations Bernoulli's equation for constant elevation: P1 + .5p(v1)^2 = P2 + .5p(v2)^2 P1 = 140000 Pa p = 1000 kg/m^3 v1 = 2.8 L/s P2 = 102000 Pa v2 = ? Continuity equation = A1*v1 - A2*v2 = 0 A1 = pi(.01)^2 v1 = 2.8 L/s A2 = pi(r)^2 v2 = answer to Bernoulli equation above (63.21392252 L/s) 3. The attempt at a solution I plugged in all known variables to Bernoulli's equation above, and got 63.21392252 L/s for the v2 flow speed. I then used the continuity equation to search for A2, and then to find r, and then to convert to d. I found r to be .0021046149 m, doubled that to find d to be .0042092298m, and converted to cm to find the final answer to be 0.42092298 cm. This is incorrect. Can someone see where I might have done something wrong? Maybe it's a simple math error?