8-37 할리데이 11판 솔루션 일반물리학

$$ \begin{cases} H&=443\ut{m}\\ g&=9.80665\ut{m/s^2}\\ \end{cases} $$ $$ \put \begin{cases} \GE : \text{Gravitational Potential Energy}\\ {B\mkern{-0.1 em}E} : \text{Bio Energy}\\ \end{cases} $$ $$\put m= 80.0\ut{kg}$$ $$\ab{a}$$ $$\Sigma \Delta E=0,$$ $$\Delta {B\mkern{-0.1 em}E}+\Delta \GE=0$$ $$ \begin{aligned} -\Delta {B\mkern{-0.1 em}E}_a&=\Delta(mgh)\\ &=mg\Delta h\\ &=mgH\\ &=35440g\\ &=347547.676\ut{J}\\ &\approx 3.48\times10^5\ut{J}\\ &\approx 348\ut{kJ} \end{aligned} $$ $$\ab{b}$$ $$ \begin{aligned} -\Delta {B\mkern{-0.1 em}E}_b&=-\Delta {B\mkern{-0.1 em}E}_a\\ &\approx 348\ut{kJ} \end{aligned} $$