일반물리학 1 — Rolling, Torque, and Angular Momentum: Problem 17

17 A yo-yo has a rotational inertia of \(950 \text{ g}\cdot\text{cm}^2\) and a mass of \(120 \text{ g}\). Its axle radius is \(3.2 \text{ mm}\), and its string is \(120 \text{ cm}\) long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? (b) How long does it take to reach the end of the string? As it reaches the end of the string, what are its (c) linear speed, (d) translational kinetic energy, (e) rotational kinetic energy, and (f) angular speed?