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Solution: The helicopter view in Fig. P3.29 (page 74) shows two people pulling on a stubborn mule. The person on the right pulls with a force F S 1 of magnitude 120 N and direction of u1 5 60.0°. The person on the left pulls with a force F S 2 of magnitude 80.0 N and direction of u2 5 75.0°. Find (a) the single force that is equivalent to the two forces shown and (b) the force that a third person would have to exert on the mule to make the resultant force equal to zero. The forces are measured in units of newtons (symbolized N).

Problem

The helicopter view in Fig. P3.29 (page 74) shows two people pulling on a stubborn mule. The person on the right pulls with a force F S 1 of magnitude 120 N and direction of u1 5 60.0°. The person on the left pulls with a force F S 2 of magnitude 80.0 N and direction of u2 5 75.0°. Find (a) the single force that is equivalent to the two forces shown and (b) the force that a third person would have to exert on the mule to make the resultant force equal to zero. The forces are measured in units of newtons (symbolized N).