11-42 할리데이 11판 솔루션 일반물리학

$$\begin{cases} I&=14.0\ut{kg\cdot m^2}\\ \tau&=5.00+2.00t\ut{N\cdot m}\\ L_1&=5.00\ut{kg\cdot m^2/s}\\ \end{cases}$$ $$\vec \tau_\net=\dyt{\vec L},$$ $$\begin{aligned} L_3 &=L_1+\Delta L_{1\rarr3}\\ &=L_1+\int_1^3\tau \dd t\\ &=5+\brac{5t+t^2}_1^3\\ &=23\ut{kg\cdot m^2/s} \end{aligned}$$