5-25 할리데이 11판 솔루션 일반물리학

$$\begin{cases} m&=85\ut{kg}\\ g_E&=9.80665\ut{m/s^2}\\ g_M&=3.7\ut{m/s^2}\\ g_S&=0\\ \end{cases}$$ $$\ab{a}$$ $$\begin{aligned} mg_E&=833.56525\ut{N}\\ &\approx 8.3\times10^2\ut{N} \end{aligned}$$ $$\ab{b}$$ $$\begin{aligned} mg_M&=314.5\ut{N}\\ &\approx 3.1\times10^2\ut{N} \end{aligned}$$ $$\ab{c}$$ $$\begin{aligned} mg_S&=0\\ \end{aligned}$$ $$\ab{d}$$ $$m=m_E=m_M=m_S=85\ut{kg}$$