Orbits

• 1L20.10 - Gravity Well - Black Hole
• 1L20.25 - String Unwinding From a Pole - Relaxation Oscillator
• 1L20.30 - Escape Velocity (Escape from a Gravity Well)
• 1L20.40 - Conical Sections
• 1L20.50 - Ellipse Maker
• 1L20.60 - Kepler's Laws
• 1L20.66 - Orbits on the Overhead/Mass Spectrometer Model