Calculate the force the biceps muscle must exert to hold the forearm and its load as shown

Question:

Calculate the force the biceps muscle must exert to hold the forearm and its load as shown in Figure 9.25, and compare this force with the weight of the forearm plus its load. You may take the data in the figure to be accurate to three significant figures.Triceps muscle FE 4.0 cm 7 16 cm FB Biceps muscle m = 2.5 kg CG Wa 38 cm CG 13 (a) (b) PHYSICS m = 4.0 kg CG

Strategy

There are four forces acting on the forearm and its load (the system of interest). The magnitude of the force of the biceps is FB; that of the elbow joint is FE; that of the weights of the forearm is wa, and its load is wb. Two of these are unknown (FB and FE), so that the first condition for equilibrium cannot by itself yield FB. But if we use the second condition and choose the pivot to be at the elbow, then the torque due to FE is zero, and the only unknown becomes FB.

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