Talk:Ordinary Differential Equations/Simple Harmonic Motion

I've changed example 2 because 1 cm = 0.01 m.

I think SI units should be used throughout. People will get problems if they think they can generally use physical equations using non SI units. Btw, what is a slug????

proof of the equation- if y1=A sin(wt+k1)and y2=A sin(wt+k2) then y=A sin(wt+k).

Differential solution
Can you elaborate the differential solution a bit more? Here are the questions which bother me: 1. Why to multiply by v=dx/dt? Why does it work? 2. What does it mean that these addends are exact derivatives and how does it helps us to integrate? 3. Why can't we separate variables? (I know that we can't but I don't know why. It's a question from some other website.) 4. How to integrate the monster dx/sqrt(2E/m - kx^2/m) = +-dt ? 5. How is that monster and its parts related to the common solutions v = +-iw x, a = -w^2 x ? --83.5.206.15 (talk) 11:58, 7 January 2011 (UTC)