**Text Transcription:** With the shoulder flexed at 30°, the moment arm of the deltoid muscle is 2.0 cm. Solve for the force exerted by the deltoid muscle at the glenohumeral joint given the following assumptions: - The deltoid is the only active muscle at the glenohumeral joint. - The weight of the humerus is 48 N. - The center of gravity of the humerus is located 30 cm from the shoulder center of rotation. **Diagram Explanation:** The diagram is labeled "STATIC EQUILIBRIUM EQUATIONS CONSIDERING ONLY THE DELTOID MUSCLE." It illustrates the shoulder joint, focusing on the glenohumeral area. Notable elements include: - A representation of the humerus with the shoulder flexed at an angle of 30°. - The moment arm of the deltoid muscle is marked as 2.0 cm. - A point of rotation is indicated at the shoulder joint. - A line representing the deltoid muscle force (F_d). - The weight of the humerus (F_g = 48 N) is shown acting downward at the humerus's center of gravity, which is 30 cm from the point of rotation. - The angle (θ) between the deltoid muscle force and the horizontal is marked at 55°. - External force (F_e) acting downward is shown as 24 N, represented along an extended line parallel to F_g. The diagram aids in understanding the biomechanical forces acting on the shoulder and helps in calculating the force exerted by the deltoid muscle.
**Text Transcription:** With the shoulder flexed at 30°, the moment arm of the deltoid muscle is 2.0 cm. Solve for the force exerted by the deltoid muscle at the glenohumeral joint given the following assumptions: - The deltoid is the only active muscle at the glenohumeral joint. - The weight of the humerus is 48 N. - The center of gravity of the humerus is located 30 cm from the shoulder center of rotation. **Diagram Explanation:** The diagram is labeled "STATIC EQUILIBRIUM EQUATIONS CONSIDERING ONLY THE DELTOID MUSCLE." It illustrates the shoulder joint, focusing on the glenohumeral area. Notable elements include: - A representation of the humerus with the shoulder flexed at an angle of 30°. - The moment arm of the deltoid muscle is marked as 2.0 cm. - A point of rotation is indicated at the shoulder joint. - A line representing the deltoid muscle force (F_d). - The weight of the humerus (F_g = 48 N) is shown acting downward at the humerus's center of gravity, which is 30 cm from the point of rotation. - The angle (θ) between the deltoid muscle force and the horizontal is marked at 55°. - External force (F_e) acting downward is shown as 24 N, represented along an extended line parallel to F_g. The diagram aids in understanding the biomechanical forces acting on the shoulder and helps in calculating the force exerted by the deltoid muscle.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
Related questions
Question
Transcribed Image Text:**Text Transcription:**
With the shoulder flexed at 30°, the moment arm of the deltoid muscle is 2.0 cm. Solve for the force exerted by the deltoid muscle at the glenohumeral joint given the following assumptions:
- The deltoid is the only active muscle at the glenohumeral joint.
- The weight of the humerus is 48 N.
- The center of gravity of the humerus is located 30 cm from the shoulder center of rotation.
**Diagram Explanation:**
The diagram is labeled "STATIC EQUILIBRIUM EQUATIONS CONSIDERING ONLY THE DELTOID MUSCLE." It illustrates the shoulder joint, focusing on the glenohumeral area. Notable elements include:
- A representation of the humerus with the shoulder flexed at an angle of 30°.
- The moment arm of the deltoid muscle is marked as 2.0 cm.
- A point of rotation is indicated at the shoulder joint.
- A line representing the deltoid muscle force (F_d).
- The weight of the humerus (F_g = 48 N) is shown acting downward at the humerus's center of gravity, which is 30 cm from the point of rotation.
- The angle (θ) between the deltoid muscle force and the horizontal is marked at 55°.
- External force (F_e) acting downward is shown as 24 N, represented along an extended line parallel to F_g.
The diagram aids in understanding the biomechanical forces acting on the shoulder and helps in calculating the force exerted by the deltoid muscle.
Expert Solution
Step 1
Given,
Weight of humerus = 48N
Shoulder is flexed at 30 degree
Moment arm of the deltoid muscle is 2cm
We need to solve for the force exert by the deltoid muscle.
Step by step
Solved in 2 steps with 1 images
Recommended textbooks for you
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:
9780321820464
Author:
Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:
Addison-Wesley
College Physics: A Strategic Approach (4th Editio…
Physics
ISBN:
9780134609034
Author:
Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:
PEARSON