A per son bends forward to lift a load with his back. To see that this is not a good way to lift, we will find the large induced force R = Rx(i) + Ry(j) occurring in the spine by lifting a 200-N object. The spine and the upper body are represented as a uniform horizontal rod of weight 350 N, pivoted at the base of the spine. The erector spinalis muscle, attached at a point 2/3 of the way up the spine, maintains the position of the back with tension T. The angle between the spine and this muscle theta = 12 degrees. Find the magnitude of force R at the base of the spine.
A per son bends forward to lift a load with his back. To see that this is not a good way to lift, we will find the large induced force R = Rx(i) + Ry(j) occurring in the spine by lifting a 200-N object. The spine and the upper body are represented as a uniform horizontal rod of weight 350 N, pivoted at the base of the spine. The erector spinalis muscle, attached at a point 2/3 of the way up the spine, maintains the position of the back with tension T. The angle between the spine and this muscle theta = 12 degrees. Find the magnitude of force R at the base of the spine.
College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
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A per son bends forward to lift a load with his back.
To see that this is not a good way to lift, we will find the large induced force R = Rx(i) + Ry(j) occurring in the spine by lifting a 200-N object.
- The spine and the upper body are represented as a uniform horizontal rod of weight 350 N, pivoted at the base of the spine.
- The erector spinalis muscle, attached at a point 2/3 of the way up the spine, maintains the position of the back with tension T.
- The angle between the spine and this muscle theta = 12 degrees.
Find the magnitude of force R at the base of the spine.
Transcribed Image Text:Back muscle
Pivot
a
R₂
T 12.0°
Rx
b
350 N
200 N
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