6. A. The arm of the couple is B. The moment of the couple about point A is . C.

Question

6. A. The arm of the couple is B. The moment of the couple about point A is . C. If Point A is moved so that it is 20 inches to the right of Fi, what will be the effect on the moment? It will be twice the original moment (the moment found for the problem above), and the opposite sign will apply. The moment will have the opposite sign of the original moment. The moment will have the same value. The moment will be -400 in-lbs. a. b. c. d. The moment of a couple is determined by the force F and the distance from the midpoint of that couple to the point about which it acts. D. a. True b. False

Explanation / Answer

The arm of the couple is 10 in

b)

moment of couple about A is = 20(22/12 ) - (20*10/12) ft-lb

                            = 20 ft-lb

c) option A is the answer

d) true

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