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Problem 1. Consider an 80-kg man assuming a position as shown in the figure below. The weight of the torso (W) is 60% of the total weight of the man while the weight of the head and arms is 50% of the weight of the torso. The spine makes an angle of 55° with respect to the vertical axis while the erector spinalis muscle makes an angle of 12° with respect to the spine. W, acts at point B while W, acts at point E which is midway between points B and A. The force exerted by the erector spinalis muscle acts at a point D such that segment AD is about 75% the length of the segment AB.

Problem 1. Consider an 80-kg man assuming a position as shown in the figure below. The weight of the torso (W) is 60% of the total weight of the man while the weight of the head and arms is 50% of the weight of the torso. The spine makes an angle of 55° with respect to the vertical axis while the erector spinalis muscle makes an angle of 12° with respect to the spine. W, acts at point B while W, acts at point E which is midway between points B and A. The force exerted by the erector spinalis muscle acts at a point D such that segment AD is about 75% the length of the segment AB.

International Edition---engineering Mechanics: Statics, 4th Edition
International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter4: Coplanar Equilibrium Analysis
Section: Chapter Questions
Problem 4.41P: The center of gravity of the 3000-lb car is at G. The car is parked on an incline with the parking...
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Problem 1. Consider an 80-kg man assuming a position as shown in the figure below. The weight of the torso (W) is 60% of the total weight of the man while the weight of the head and arms is 50% of the weight of the torso. The spine makes an angle of 55° with respect to the vertical axis while the erector spinalis muscle mnakes an angle of 12° with respect to the spine. W, acts at point B while W, acts at point Ewhich is midway between points B and A. The force exerted by the erector spinalis muscle acts at a point D such that segment AD is about 75% the length of the segment AB. Erector spinalis muscle Pivot point A W What is the magnitude of the force exerted by the erector spinalis muscle (in newtons, N)? Round off your answer up to 3 decimal places. What is the magnitude of the force exerted on the fifth lumbar vertebra (in newtons, N)? Round off your answer up to 3 decimal places. • What is the angle (in degrees) that the force exerted on the fifth lumbar vertebra makes with the horizontal? Note: Use absolute values (i.e. no negatively-signed answers).
Transcribed Image Text:Problem 1. Consider an 80-kg man assuming a position as shown in the figure below. The weight of the torso (W) is 60% of the total weight of the man while the weight of the head and arms is 50% of the weight of the torso. The spine makes an angle of 55° with respect to the vertical axis while the erector spinalis muscle mnakes an angle of 12° with respect to the spine. W, acts at point B while W, acts at point Ewhich is midway between points B and A. The force exerted by the erector spinalis muscle acts at a point D such that segment AD is about 75% the length of the segment AB. Erector spinalis muscle Pivot point A W What is the magnitude of the force exerted by the erector spinalis muscle (in newtons, N)? Round off your answer up to 3 decimal places. What is the magnitude of the force exerted on the fifth lumbar vertebra (in newtons, N)? Round off your answer up to 3 decimal places. • What is the angle (in degrees) that the force exerted on the fifth lumbar vertebra makes with the horizontal? Note: Use absolute values (i.e. no negatively-signed answers).
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