11판/6. 힘과 운동 II

6-33 할리데이 11판 솔루션 일반물리학

짱세디럭스 2024. 3. 4. 18:59

$$ \begin{cases} m&=40\ut{kg}\\ F&=65\ut{N}\\ S&=1.4\ut{m}\\ v&=1.0\ut{m/s}\\g&=9.80665\ut{m/s^2} \end{cases} $$ $$2aS=v^2-{v_0}^2,$$ $$ \begin{aligned} a&=\frac{v^2-{0}^2}{2S}\\ &=\frac{5}{14}\ut{m/s^2} \end{aligned} $$ $$\Sigma \vec F = m\vec a,$$ $$ \begin{cases} \Sigma F_x &= m a_x\\ \Sigma F_y &= 0\\ \end{cases} $$ $$ \begin{cases} m a &= F-\mu F_N\\ 0 &= F_N-mg\\ \end{cases} $$ $$ \begin{aligned} m a &= F-\mu mg\\ \mu &=\frac{F-ma}{mg}\\ &=\frac{71}{56g}\\ &\approx 0.12928544843113018\\ &\approx 0.13\\ \end{aligned} $$