일반물리학 1 — Rotation: Problem 41

41 In Fig. 10-27, two particles, each with mass \( m = 0.85 \text{ kg} \), are fastened to each other, and to a rotation axis at \( O \), by two thin rods, each with length \( d = 5.6 \text{ cm} \) and mass \( M = 1.2 \text{ kg} \). The combination rotates around the rotation axis with the angular speed \( \omega = 0.30 \text{ rad/s} \). Measured about \( O \), what are the combination’s (a) rotational inertia and (b) kinetic energy?