PH-611

Moments

Physics · Secondary 3 · Hard · Moments

A uniform 3.0 m plank is balanced on a pivot placed 1.0 m from its left end. A 40 N weight hangs from the left end.
What upward force must the pivot provide for the plank to be in equilibrium?

$80\,\text{N}$
$20\,\text{N}$
$40\,\text{N}$
$120\,\text{N}$

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