Pete holds a 35 kg mass in hand as shown in the figure. Pete Pete holds a 35 kg

Question

Pete holds a 35 kg mass in hand as shown in the figure. Pete

Pete holds a 35 kg mass in hand as shown in the figure. Pete's forearm is in static equilibrium and his bicep muscle is responsible for holding the forearm in equilibrium. The bicep is attached to the forearm 5.0 cm in front of the elbow which serves as the rotation axis. The forearm itself has a mass of 2 kg. Determine the size of the force (labeled Fmax in the figure) that the bicep exerts to keep the forearm in equilibrium. Determine also the horizontal and vertical forces acting on the elbow produced by the humerus (the upper arm bone)

Explanation / Answer

in equilibrium net torque = 0


Fmax*0.05*sin105 = 2*9.81*(0.015/2) + 35*9.8*(0.035)

Fmax = 2516.166287 N

along horizontal

Fnet = 0

Fx = Fmax*cos105 = ?651.231756 N

along vertical direction

Fnet = 0

Fy = Fmax*sin105 = 2430.43 N

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