1. The problem statement, all variables and given/known data 1. Do you use the equation of continuity and Bernoulli's equation simultaneously in a question? When do you use them? 2. In simple harmonic motion, why is the velocity shifted to left of the displacement by pi/4? 2. Relevant equations pressure + .5density x velocity ^2 + density x g x y (initial)= the same thing (final) A1V1=A2V2 (continuity) x(t)=xmaxcos(wt + phi) here w=omega 3. The attempt at a solution I've been reading my book, but I am confused about these issues. Please help.