• A person is standing up and holding in front of them a barbell with weights (total mass of barbell and weights = 30 kg). The force of gravity acts on the barbell at a perpendicular distance of 0.2 m in front of the axis of rotation (the spine). To maintain equilibrium, the erector spinae muscles are activated and act downwards and behind the person at a perpendicular distance 0.03 m away from the axis of rotation.
•  Calculate the force that is required to be produced by the erector spinae muscles to maintain equilibrium.

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To maintain equilibrium the Torques acting on the system must balance each other The t... View the full answer