A small marble slides along the inside surface of a cup which has a cross-sectional shape given by y = 0.100x ^ 2 , where x is the displacement from the center of the cup and y is the height of the surface above the bottom. If a harmonic oscillation is started, what would be its frequency?

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up