For Engineers:

This is a quick refresher in physics.

For non-Engineers:

This is Sinusoidal Motion,
 

and this is Harmonic Motion.
 

But For Trained Engineers:

This is Classic Sinusoidal &Harmonic Motion Together.

Thought you'd like to keep abreast of the latest
classic mathematical and engineering problems.

Smiley from  rfslick on 9/20/2008