Full figure

Fig. 1. The block on a flat plate. Our theory is restricted to small-amplitude oscillations ( << 1). First citation in article

Full figure

Fig. 2. An off-center tunnel through the Earth. The motion is simple harmonic with / 2 = 42 min for all amplitudes, and the tunnel need not pass through the center of the Earth. First citation in article

Full figure

Fig. 3. The long-string pendulum. Our theory is restricted to small-amplitude oscillations (, << 1). First citation in article