Question

To practice Problem-Soving Strabegy 8 1 Staic equlibrium problems When you in an object by moving only your torearm, the main ifting musdle in your arm is the biceps Suppose the mass of a fore arm is 150 kg If the biceps is connected to the fore arm a distanvce d 3.00 cm trom the elbow, how much force must the biceps exert to hold a 750 g ball at the end of Part F the forearm at distance d 31.0 cm from the elbow, with the forearm parallel to the floor? How much force F must the Determine the signor- of the torque about tha elbow caused by the biceps, weight of the bailh Express your answers as using and separated by comnmas the sign of the weight of he forearmand e sign or ne elbow exert? (Figure 1) Figure Biceps Learning Goal: To practice Problem-Solving Strategy 8.1 Static equilibrium problems. When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.50 kg. If the biceps is connected to the forearm a distance dbiceps 3.00 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 750 g ball at the end of the forearm at distance dball 31.0 cm from the elbow, with the forearm parallel to the floor? How much force Felbow must the elbow exert? (Figure 1) Figure 1 of 1 Biceps hall Part F Determine the sign (+ or-of the torque about the elbow caused by the biceps, pe the sign of the weight of the forearm, Tomarm, and the sign of the weight of the ball, Thall and - separated by commas Express your answers as using Submit Beaveat.Answer

Answer 1

first take moment about elbow to find force in biceps and then substitute as shown above

out of page ,_ Into the page biceps b Ball B -Felbow biceps aig BALL Forearm dgall 6.3lTm For Esuil'bai um, moments of Foxce abotbe Esual clockwise moment = Anticlockwise moment 2 0.75 0.31+ 15.5031-0.03FelLx 0.3 Fell 13.25 N For static E0uilibrum / Σ'mo," we dB+%, de = 팅.db 2 -WB .dg + WIra . dB. 0.75X 0.3l+1. 5x 2.죄 2 0.03 About Elbow 2 = 十0.465,-0.2325,-0.2325

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