Answer: Torque of Swallow on 40 N Rod with 1 m Length

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Homework Statement



James Gomer holding a uniform 40 N rod of length 1 m horizontally with a hinge on its left end and a vertical string on the right end. Now suppose a fully laden swallow with a mass of 2.00 kg lands and squawks loudly on the rod at a point 30.0 cm to the right of the hinge. Now what is the force exerted by the string to keep the rod horizontal?

Homework Equations





The Attempt at a Solution



I figured out that the string with no force exerted on the rod is 20N, so Far I have

Ʃfnet = 2kg*9.8*20(moment arm) - F*20

I don't think I have my setup correct though.. I'm just not visualizing this well
 
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What point are you taking moments about? List the forces and their orthogonal distances from that point.