## University Physics with Modern Physics (14th Edition)

$$F=6612N$$
$w=mg=3400$ $\Sigma\tau=FL-wL=0$ $FrSin\theta - mgL=0$ Find the force needed to lift the ladder: $F=\frac{mgL}{rSin\theta}$ $F=\frac{(3400)(10)}{8Sin(40)}= 6612 N$