68. Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces A, B, and C shown in Fig. 1.38. Find the magnitude and direction of a fourth force on the stone that will make the vector sum of the four forces zera.
68. Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces A, B, and C shown in Fig. 1.38. Find the magnitude and direction of a fourth force on the stone that will make the vector sum of the four forces zera.
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