Answer:
Step-by-step explanation:
Given that,
The length of the beam L = 3.10m
The mass of the steam beam
= 430kg
The mass of worker
= 69.0kg
The distance from the fixed point to centre of gravity of beam =

and our length of beam is 3.10m
so the distance from the fixed point to centre of gravity of beam is

Then the net torque is

is the weight of steel rod

is the weight of the worker

Torque can now be calculated

≅ 9169Nm
Therefore,the magnitude of the torque is 9169Nm