Angles: Angle of forearm-hand segment relative to horizontal = 0 Angle-of-insertion of M to forearm - 90 Angle of J to X axis = unknown %3D Forces: Forearm-hand segment weight (S) = 17 N Exercise weight (W) = 60 N Muscle force (M) = unknown Joint reaction force (J) at the elbow = unknown %3D Moment arms: External moment arm to Sy (EMAsy) = 0.15 m External moment arm to Wy (EMAWY) = 0.35 m Internal moment arm to My (IMA) = 0.05 m Wy

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