How much torque would the shoulder muscle group in the image need to exert to hold the arm in a static position, if the weight in the hand is 20kg and the total length of the arm is 0.75m? Gravity = -9.81 m/s. 1. 147 Nm CW 2. 15 Nm CW 3. 175 Nm CW 4. 147 Nm CCW 5. 15 Nm CCW 6. 175 Nm CCW