1-2 할리데이 11판 솔루션 일반물리학

$$\begin{cases} \Delta x_1 &= 23\ut{cm}\\ \Delta y_1 &= 19\ut{cm}\\ \Delta x_2 &= 28\ut{cm}\\ \Sigma \Delta y &= 9.50\ut{m}\\ \end{cases}$$ $$\Sigma \Delta x_2 - \Sigma \Delta x_1=?$$ $$\begin{aligned} N &= \frac{\Sigma \Delta y}{\Delta y_1} \\ &= \frac{9.50\ut{m}}{19\ut{cm}}\\ &= 50 \end{aligned}$$ $$\begin{aligned} \Ans&=\Sigma \Delta x_2 - \Sigma \Delta x_1\\ &= N \cdot \Delta x_2 - N \cdot \Delta x_1\\ &= N \(\Delta x_2 - \Delta x_1 \)\\ &= 50 \cdot (28\ut{cm}-23\ut{cm})\\ &= 250 \ut{cm} \\ &= 2.5\ut{m} \end{aligned}$$