The magnitude of torque about the point where the beam is bolted into place is 12544 Nm.
The length of the beam = l = 4 m
The mass of the steel beam = M = 500 Kg
Mass of the construction worker = m = 70 Kg
Torque of steel beam = T₁
Torque of worker = T₂
The magnitude of torque = T =
Torque is the force in a distance the relation is proportional so the torque of weight first is:
= Torque of steel beam = Force of steel beam X distance
= T₁ = F₁ X d
= T₁ = M X g X l
= T₁ = 500 X 9.8 X 4
= T₁ = 9800 Nm
Torque is the force in a distance the relation is proportional so the torque of weight second is:
= Torque of steel beam = Force of steel beam X distance
= T₂ = F₂ X d
= T₂ = m X g X l
= T₂ = 70 X 9.8 X 4
= T₂ = 2744 Nm
Net torque = T =
= T = T₁ + T₂
= T = 9800 + 2744
= T = 12544 Nm
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