Physics

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A mobile consists of two very lightweight rods of length l = 0.400 m connected to each other and the ceiling by vertical strings. (Neglect the masses of the rods and strings.) Three objects are suspended by strings from the rods. The masses of objects 1 and 3 are m1 = 5.90 kg and m3 = 3.18 kg. The distance x shown in the figure is 0.174 m. What is the mass of
m2?

The answer is 4.48 kg. How do I get this answer?

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    I'll post the link to the figure once Jiskha okays the url.

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