10_InstSolManual_PDF_Part15

# 10_InstSolManual_PDF_Part15 - Dynamics of Rotational Motion...

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Solve: (a) The free-body diagram is given in Figure 10.45. Figure 10.45 (b) gives and gives (c) gives and Reflect: The friction force required increases when the angle between the ladder and the wall increases, when the ladder becomes closer to horizontal. 10.46. Set Up: There is a normal force at the wall. At the floor there is a normal force n and a friction force The center of gravity of the ladder is 3.5 m from each end. Let be upward and be horizontal, toward the wall. Let the pivot be at the foot of the ladder and let counterclockwise torques be positive. Solve: (a) The free-body-diagram is given in Figure 10.46. Figure 10.46 (b)
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Unformatted text preview: gives (c) gives and gives and n 5 w p 1 w L 5 750 N 1 450 N 5 1200 N n 2 w p 2 w L 5 g F y 5 f 5 300 N n w 2 f 5 g F x 5 n w 5 1 750 N 21 1.375 m 2 1 1 450 N 21 1.75 m 2 6.062 m 5 300 N n w 1 7.0 m 21 sin 60.0° 2 2 w p 1 2.75 m 21 cos 60.0° 2 2 w L 1 3.5 m 21 cos 60.0° 2 5 g t 5 x y w p w L n f n w 3.5m 0.75m 2.25m Pivot 1 1 x 1 y f . n w f 5 n w 5 87.5 N f 2 n w 5 g F x 5 n w 5 1 2 w sin 35° cos 35° 5 1 2 w tan 35° 5 87.5 N n w L cos 35° 2 w 1 L 2 sin 35° 2 5 g t 5 n 5 250 N. n 2 w 5 g F y 5 x y n f 65 ° 35 ° n w Pivot L 2 L 2 w 1 Dynamics of Rotational Motion 10-15...
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