Calculate the magnitude of the resultant joint force at L5/S1 joint for the stoop lift. The worker has a height of 1.8 meters and a mass of 84 kg. The box has a mass of 30 kg. - Assume that the back extensor muscles have a line of action parallel to and 5 cm posterior (on the back side) to the trunk. - Assume the hands are at the center of the box. - Use the following masses and COM locations to calculate the moment at the L5/S1 joint - Note: the body masses and COM positions for the parts of the body are not in kg or cm. They are % of the whole body mass/% away from L5/ S1 joint. You need to convert these percentages to kg and cm. - Only consider the FBD and forces for one arm. Assume each arm holds 15kg of the box weight
Calculate the magnitude of the resultant joint force at L5/S1 joint for the stoop lift. The worker has a height of 1.8 meters and a mass of 84 kg. The box has a mass of 30 kg. - Assume that the back extensor muscles have a line of action parallel to and 5 cm posterior (on the back side) to the trunk. - Assume the hands are at the center of the box. - Use the following masses and COM locations to calculate the moment at the L5/S1 joint - Note: the body masses and COM positions for the parts of the body are not in kg or cm. They are % of the whole body mass/% away from L5/ S1 joint. You need to convert these percentages to kg and cm. - Only consider the FBD and forces for one arm. Assume each arm holds 15kg of the box weight
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...
Related questions
Topic Video
Question
100%
Transcribed Image Text:Calculate the magnitude of the resultant joint force
at L5/S1 joint for the stoop lift. The
worker has a height of 1.8 meters and a mass of 84
kg. The box has a mass of 30 kg.
- Assume that the back extensor muscles have a line
of action parallel to and 5 cm
posterior (on the back side) to the trunk.
- Assume the hands are at the center of the box.
- Use the following masses and COM locations to
calculate the moment at the L5/S1 joint
- Note: the body masses and COM positions for the
parts of the body are not in kg or cm.
They are % of the whole body mass/% away from L5/
S1 joint. You need to convert these
percentages to kg and cm.
- Only consider the FBD and forces for one arm.
Assume each arm holds 15kg of the box
weight
Transcribed Image Text:trunk
Length of the trunk is 0.52 m
Length of the upper arm is 0.33 m
Length of the forearm is 0.26 m
Upper arm
forearm
90 deg.
hand
Fm
% of body mass
43.5
2.7
5cm
1.6
negligible
Longitudinal COM position from
(% length from major joint)
43.1% away from shoulder
57.7% away from shoulder
45.7% away from elbow
negligible
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 2 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
International Edition---engineering Mechanics: St…
Mechanical Engineering
ISBN:
9781305501607
Author:
Andrew Pytel And Jaan Kiusalaas
Publisher:
CENGAGE L
International Edition---engineering Mechanics: St…
Mechanical Engineering
ISBN:
9781305501607
Author:
Andrew Pytel And Jaan Kiusalaas
Publisher:
CENGAGE L