10_InstSolManual_PDF_Part27 - Dynamics of Rotational Motion...

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10.71. Set Up: Her upper arm has weight Her forearm has weight The free-body diagram for the arm is given in Figure 10.71. is the force exerted on the arm by the shoulder joint. Take the pivot at the shoulder joint and let counterclockwise torques be positive. Figure 10.71 Solve: (a) The center of mass is 19.2 cm to the right and 8.2 cm above the shoulder joint. (b) gives (c) All the other forces on the arm are vertical so has no horizontal component and gives and upward. 10.72. Set Up: Her upper arm has weight and her forearm has weight The free-body diagram for the arm is given in Figure 10.72. Take the pivot at the shoulder joint and let counterclockwise torques be positive. The forces F and W have been replaced by their x and
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Unformatted text preview: and y components. Figure 10.72 13.0cm Pivot 13.0cm 9.75cm 27.9cm 19.5cm y F h W sin55 ° W cos55 ° W F v w f w u F x 55 ° 55 ° 1 17.0cm 17.0cm w f 5 21.1 N. w u 5 22.8 N F 5 w u 1 w f 2 W 5 22.8 N 1 21.1 N 2 32.5 N 5 11.4 N, F 1 W 2 w u 2 w f 5 g F y 5 F y 5 F . F S W 5 w f 1 1 2 w u 5 21.1 N 1 11.4 N 5 32.5 N W 1 26.0 cm 2 2 w f 1 26.0 cm 2 2 w u 1 13.0 cm 2 5 g t 5 y cm 5 w f 1 17.0 cm 2 w u 1 w f 5 1 21.1 N 21 17.0 cm 2 22.8 N 1 21.1 N 5 8.2 cm x cm 5 w u 1 13.0 cm 2 1 w f 1 26.0 cm 2 w u 1 w f 5 1 22.8 N 21 13.0 cm 2 1 1 21.1 N 21 26.0 cm 2 22.8 N 1 21.1 N 5 19.2 cm x 13.0cm 13.0cm W w f w u y F Pivot 17.0cm 1 F S w f 5 21.1 N. w u 5 22.8 N. Dynamics of Rotational Motion 10-27...
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  • Spring '07
  • Shoberg
  • Force, 1 W, Upper limb anatomy, 1 17.0 cm, 1 27.9 cm

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