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"
Chapter2: Loads On Structures
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Transcribed Image Text: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
E
- 4"-
2"
14"
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