일반물리학 1 — Potential Energy and Conservation of Energy: Problem 34

34 A boy is initially seated on the top of a hemispherical ice mound of radius \( R = 12.8 \text{ m} \). He begins to slide down the ice, with a negligible initial speed (Fig. 8-35). Approximate the ice as being frictionless. At what height does the boy lose contact with the ice?