Exercise: Force System Resultants

Questions for: Force System Resultants

Determine the moment of force F1 about point A on the beam.

A:
M1 = 1600 ft-lb
B:
M1 = 100 ft-lb
C:
M1 = 100 ft-lb
D:
M1 = 1600 ft-lb
Answer: D
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The main beam along the wing of an airplane is swept back at an angle of 25°. From load calculations it is determined that the beam is subjected to couple moments aMx = 25,000 lb • ft and My = 17,000 lb • ft. Determine the equivalent couple moments created about the x' and y' axis.

A:
Mx' = 26.0 kip-ft, My' = 29.8 kip-ft
B:
Mx' = 29.8 kip-ft, My' = -4.84 kip-ft
C:
Mx' = 26.0 kip-ft, My' = 15.47 kip-ft
D:
Mx' = 29.8 kip-ft, My' = 4.84 kip-ft
Answer: C
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