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. Back muscleR,* 12.0°Pivot200 N350 Na

Given: Weight of the load W = 200 N Weight of the spine and upper body wight is 350 N

Answered: R, * 12.0° Pivot 200 N 350 N

College Physics

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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.

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

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