A person 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. Back muscleR,7 12.0°Pivot200 N350 Na

We need to calculate the magnitude of force R at the base of the spine.

Answered: A person bends forward to lift a load…

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter15: Fluids

Section: Chapter Questions

Problem 7PQ

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A person 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.

Back muscle
R,
7 12.0°
Pivot
200 N
350 N
a

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