W E EGR 23 Final Fall 2017 7. Two tractors A and B are attached by cables to a l

Question

W E EGR 23 Final Fall 2017 7. Two tractors A and B are attached by cables to a log, as shown at right, and pull with forces FA 800 lb and Fs 400 lb (the angle 8 159). Which of the diagrams below best represents the force triangle relationship that could be used to find the resultant FR of the two forces? B) D) 45 800 800 8. Instead, suppose that tractor A pulls at the same 30 angle but not necessarily with the same force as shown above. If the objective is to produce a resultant force of 1000 lb aligned with the axis of the log (the horizontal in the picture), at what angle should tractor B pull in order to minimize its pulling force F? A) 30 B) 45 D) 90

Explanation / Answer

7) Option D is correct. In vector form, Two components will not start at a point. So, eliminate option A and B. Then Two component head or tails will not meet at a point. So, eliminate option C. one component will start at at components head. Hence option D is correct.

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