https-/ temView?assignmentProblemiD 81177853 e Work 10 Problern 9.32 previous 11

Question

https-/ temView?assignmentProblemiD 81177853 e Work 10 Problern 9.32 previous 11 of 12 I net blem 9.32 Part A Approximatoly what magnitude force, Fu, must the extensor musdle in the upper arm exert on the lower arm to hold a 7.1-kg shot put (Eigure 1) ? Assume the lower am has a mass of 3.1 kg and its CG is 13 cm from the elbow joint pivot. Express your answer to two significant figures and include the appropriate units 6.6.10 N 2.5 cm 30.0 cm- Submit My Answers Give Ue Incorrect; Try Again; 8 attempts remaining Elbow joint e to search

Explanation / Answer

since the arm is in equilibrium, the net torque on the arm is zero

T_ net = 0 = F_M d- mgD- MgL

F_M = (mD+ML)g/ d

=( 3.1(0.13) + 7.1(0.3)) 9.8/0.025

=992.936 N

rounding to two significant digts

F_M = 990 N

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