Modeled below within GeoGebra Augmented Reality is a [b]CIRCULAR HELIX. [/b]Parametric equations for this curve are given as follows: [br][br][math]x=a\cdot\cos\left(t\right)[/math][br][math]y=a\cdot\sin\left(t\right)[/math][br][math]z=k\cdot t[/math]. [br][br][i]a[/i] = the radius of the circle seen here. [br]In this demo, [i]a[/i] = 12. Also, [i]k[/i] = 1 and [i]t[/i] ranges from [math]-6\pi[/math] to [math]6\pi[/math]. [br][br]Other than a slinky, what other every-day real-world objects can be modeled with a circular helix?