1. The problem statement, all variables and given/known data In the given picture, A cylindrical tank has a viscous fluid with density 800 kg/m^3 and viscosity of 0.8 Pa.s. A small pipe is attached to the tank with a cross sectional area of 1 cm^2. If Q = 3.12 x 10^-6 m^3/s, Find h1, h2 ,x 2. Relevant equations Q = pi delta P a^4/(8 n L) P = rho g h 3. The attempt at a solution I was able to solve the question under the assumption that the pipe is soo small compared to the tank that velocity of water in the tank is just zero, With this assumption I can consider that the pressure in the tank is static pressure so the pressure just before the hole in a draining tank is rho g 0.4 II was wondering if we had an ideal fluid with the same setup I figured there is a better way to find the pressure at point b using brenoulli's (better approximation). We could consider v1 approximately 0 and then get V2 = sqrt(2g h), Using continuity get vb and then apply brenoulli's again between vb and v2 to get Pb. Isn't this a better approximation to the vale of Pb that static pressure way?