Non-sinusoidal oscillation: a balloon on a string

Educação Superior::Ciências Exatas e da Terra::MatemáticaPicture a buoyant balloon trailing a string with some mass per unit length. As the balloon rises, more string is lifted off the floor and the weight of the balloon-string system increases. As the balloon sinks, string returns to the floor and the weight of the balloon-string system decreases. In effect, the mass of the system depends on its positio