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Compressional force in the spine when a person bends forward

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Referring to the person is figure P12.51 on Page 384 in the text, determine the compressional force in the spine when the person bends forward to lift a 300 N object. The spine and upper body are represented as a uniform horizontal rod of weight 400 N. The erector spinalis muscle attaches at a point two thirds of the way up the spine and the angle between the spine and this muscle is 13.0o. A.550N B.650N C.2250N D.3250N Please see attached file for figure P12.51

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