Question

If you bend over, so your trunk is horizontal, the weight of your trunk exerts a rather strong torque about the sacrum, where your backbone is pivoted on your pelvis. Assume that the mass of your trunk (including arms and head) is 47 kg, and that the weight effectively acts at a distance of 0.4 m from the sacrum. What is the torque that this weight exerts?
N·m

Answer 1

mass of the sacrum , m = 47 Kg

distance, d = 0.40 m

torque about the weight = m * g * distance

torque about the weight = 47 * 9.8 * 0.40

torque about the weight = 184.24 N.m

the torque about the weight is 184.24 N.m