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A 100 lb child is standing while wearing a 10 lb backpack, as shown in the figure on the left below. His body is at rest and remains at rest. A partial free body diagram of the child's upper body is shown in the middle figure below. Shown are: W = weight of the upper body and backpack, and FM = net force from the erector spinae muscles. These forces were drawn such that 1 cm = 20 lb. Missing from the diagram, however, is the contact force acting on the L5 vertebra from the S₁ vertebra at the L5S1 joint. 1. What must be true of the sum of the external forces acting on the child's upper body during this task and why? 2. Which vector (A - K) in the figure on the right below best shows, to scale, the force acting on the child's L5 vertebra from his S₁ vertebra during this task? (Note: Click HERE for a downloadable figure) LSS₁ tor FM L5S1 W A B y C D E F G K H I x

A 100 lb child is standing while wearing a 10 lb backpack, as shown in the figure on the left below. His body is at rest and remains at rest. A partial free body diagram of the child's upper body is shown in the middle figure below. Shown are: W = weight of the upper body and backpack, and FM = net force from the erector spinae muscles. These forces were drawn such that 1 cm = 20 lb. Missing from the diagram, however, is the contact force acting on the L5 vertebra from the S₁ vertebra at the L5S1 joint. 1. What must be true of the sum of the external forces acting on the child's upper body during this task and why? 2. Which vector (A - K) in the figure on the right below best shows, to scale, the force acting on the child's L5 vertebra from his S₁ vertebra during this task? (Note: Click HERE for a downloadable figure) LSS₁ tor FM L5S1 W A B y C D E F G K H I x

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A 100 lb child is standing while wearing a 10 lb backpack, as shown in the figure on the left below. His body is at rest and remains at rest. A partial free body diagram of the child's upper body is shown in the middle figure below. Shown are: W = weight of the upper body and backpack, and FM = net force from the erector spinae muscles. These forces were drawn such that 1 cm = 20 lb. Missing from the diagram, however, is the contact force acting on the L5 vertebra from the S₁ vertebra at the L5S1 joint. 1. What must be true of the sum of the external forces acting on the child's upper body during this task and why? 2. Which vector (A - K) in the figure on the right below best shows, to scale, the force acting on the child's L5 vertebra from his S₁ vertebra during this task? (Note: Click HERE for a downloadable figure) LSS₁ tor FM L5S1 W A B y C D E F G K H I x
Transcribed Image Text:A 100 lb child is standing while wearing a 10 lb backpack, as shown in the figure on the left below. His body is at rest and remains at rest. A partial free body diagram of the child's upper body is shown in the middle figure below. Shown are: W = weight of the upper body and backpack, and FM = net force from the erector spinae muscles. These forces were drawn such that 1 cm = 20 lb. Missing from the diagram, however, is the contact force acting on the L5 vertebra from the S₁ vertebra at the L5S1 joint. 1. What must be true of the sum of the external forces acting on the child's upper body during this task and why? 2. Which vector (A - K) in the figure on the right below best shows, to scale, the force acting on the child's L5 vertebra from his S₁ vertebra during this task? (Note: Click HERE for a downloadable figure) LSS₁ tor FM L5S1 W A B y C D E F G K H I x
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