Problem #1 Person lifting with back: Forces on The Spinal Column Consider the person lifting a heavy box with his back as shown. 8 cm- 10° CGub 29 61 Wub FB 39° CG box (a) Calculate the magnitude of the force FB, in the back muscles that is needed to support the upper body plus the box. Note the cm indicated on the schematic is the lever arm associated with FB. The mass of the upper body is 55.0 kg and the mass of the box is 30.0 kg. 4196 N F 35 cm Pivot 50 cm point Wbox 1 (b) Calculate the magnitude and direction, 0, of the force Fv, exerted by the vertebrae on the spine at the indicated pivot point. 4657 N; 38°

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