A horizontal wooden plank is pivoted at one end, as shown.
The plank has a mass of 100 kg and a length of 10 m. The centre of gravity of the plank is a distance of 4 m from the pivot.
What is the moment of the weight of the plank about the pivot?

1 )
$4 \times {10^2}Nm$
2 )
$5 \times {10^2}Nm$
$4 \times {10^3}Nm$
4 )
$5 \times {10^3}Nm$
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