1. The problem statement, all variables and given/known data (i)Water flows over a dam at the rate 580kg/s and falls vertically 88m before striking the turbine blades. Calculate the speed of the water just before striking the turbine blades (SOLVED) and (ii) the rate at which mechanical energy is transferred to the turbine blades assuming 55% efficiency. 2. Relevant equations Ek = 1/2mv^2 Mechanical efficiency = Work out/Work in 3. The attempt at a solution Answer to part (i) v=sqrt2gh v = 41.5 m/s Mechanical efficiency = work out/work in Work out = Ek1 - Ek2 Work in = Ek1 - Ek2/55% Ok and I'm pretty much stuck. :( Thanks in advance for any help guys!