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2 out of 3 attempts A man is trying to lift 67.2 kg off the floor by bending at the waist. Assume that the mans Assist upper body weighs 495 N and the upper bodys center of gravity is 38.0 cm from the sacrum (tailbone) Checi Try An View H View Q Show M Guided Practice Force due to back muscles Force due to sacrum (Fs) Spine Axis (sacrum) Weight of upper body (mg Print 38.0 cm 73.3 cm A simplified model of the human back when bent over Question Report a FP Part I (a) If, when bent over, the hands are a horizontal distance of 73.3 cm from the sacrum, what torque must be exerted by the erector spinae muscles to lift 67.2 kg off the floor? (The axis of

(a) If, when bent over, the hands are a horizontal distance of 73.3 cm from the sacrum, what torque must be exerted by the erector spinae muscles to lift 67.2 kg off the floor? (The axis o S rotation passes through the sacrum.) 671 Gu Pra Prin Que Repa Part 2 out of 3 (b) When bent over, the erector spinae muscles are a horizontal distance of 44.0 cm from the sacrum and act at a 14.70 angle above the horiontal. What forcef b do the erector spinae muscles need to exert to lift the weight? N at oabove the horizontal

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0-133 m 0.44 O, 44 600 8. NAngle is 14.7 degrees

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