3. Four blocks, with masses m1 = 5.20 kg, m2 = 4.20 kg, m3 = 7.80 kg, and m4 = 7.30 kg, are pulled on a horizontal frictionless surface by a 35.0 N force that makes a 39 o angle (θ) with the horizontal (see figure). What is the magnitude of the tension between the m3 and m4 blocks?

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