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A square mass is acted upon by three forces, with the third of unknown magnitude, as shown above.

What must be the magnitude of the unknown third force in order for the box to be in translational and rotational equilibrium?

A

$F$

B

$\sqrt{2}F$

C

$\cfrac{\sqrt{3}}{2}F$

D

$3F$

E

The mass cannot be put into equilibrium regardless of the magnitude of the third force.

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