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## Homework Statement

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?

## Homework 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

## The Attempt at a Solution

I've been reading my book, but I am confused about these issues. Please help.