A person is performing slow arm curls with a 20-lb weight as indicated in the figure. The brachialis mus- cle group (consisting of the biceps and brachialis muscles) is the major factor in this exercise. Deter- mine the magnitude F of the brachialis-muscle-group force and the magnitude E of the elbow joint reaction at point E for the forearm position shown in the fig- Humerus Biceps Brachialis 8" ure. Take the dimensions shown to locate the effec- tive points of application of the two muscle groups; these points are 8 in. directly above E and 2 in. di- rectly to the right of E. Include the 3.2-lb forearm weight which acts at point G. State any assumptions. Ulna Radius 20 lb G E 4"- 2" 14"

A person is performing slow arm curls with a 20-lb weight as indicated in the figure. The brachialis mus- cle group (consisting of the biceps and brachialis muscles) is the major factor in this exercise. Deter- mine the magnitude F of the brachialis-muscle-group force and the magnitude E of the elbow joint reaction at point E for the forearm position shown in the fig- Humerus Biceps Brachialis 8" ure. Take the dimensions shown to locate the effec- tive points of application of the two muscle groups; these points are 8 in. directly above E and 2 in. di- rectly to the right of E. Include the 3.2-lb forearm weight which acts at point G. State any assumptions. Ulna Radius 20 lb G E 4"- 2" 14"

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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