# Dumbbell in a static posture

by | Nov 23, 2021 | Homework Help

A 50 kg individual is holding a dumbbell in a static posture. The mass of the dumbbell is 10kg. The coordinate of the elbow joint is (1.1m, 1.2m). The coordinate of the wrist joint is (1.3m, 1.3m). The coordinate of the center of dumbbell is (1.35m, 1.35m). The coordinate of the tip of finger is (1.4m, 1.35m). The center of mass of the forearm is 45% from the elbow to the wrist. The mass of the forearm is 2% of the total body mass. The center of mass of the hand is 35% from the wrist to the tip of finger. The mass of the hand is 1% of the total body mass. (18 points, g=-9.8m/s2). Keep 3 decimal places. a) What is the wrist flexion moment to maintain this posture? b) What is the elbow flexion moment to maintain this posture? c) If the elbow flexion moment is purely generated by the biceps and the moment arm of the biceps about the elbow joint is 0.05m, what is the biceps muscle force to maintain this posture?

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