Figure 5-62 is an overhead view of a 12 kg tire that is to be pulled by three horizontal ropes. One rope's force (F1 = 50 N) is indicated. The forces from the other ropes are to be oriented such that the tire's acceleration magnitude a is least. What is that least a if (a) F2 = 30 N, F3 = 20 N; (b) F2 = 30 N, F3 = 10 N;and (c) F2 = F3 = 30 N?
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