일반물리학 1 — Gravitation: Problem 4

4 Miniature black holes. Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of \(5.0 \times 10^{11} \text{ kg}\) (and a radius of only \(5.0 \times 10^{-16} \text{ m}\)) reached Earth, at what distance from your head would its gravitational pull on you match that of Earth's?