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$6.$ How much torque must be generated by the hip flexors to hold an $80-$N ankle weight straight out at a $90$ position? The ankle weight is $0\mathrm{.}73$ m from the hip joint. The thigh and leg weighs $130$ N $.$ The moment arm for the hip flexors muscle is $0\mathrm{.}08$ m $.$

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a$.58\mathrm{.}4N-m$

b$.106N-m$

c$.1,323N-m$

d$.$ Not enough information