Engineering Mechanics - Force System Resultants

Exercise :: Force System Resultants - General Questions

  • Force System Resultants - General Questions
26. 

Determine the magnitude and direction of the couple moment.

A. M = 3900 lb-ft CW
B. M = 3900 lb-ft CCW
C. M = 3120 lb-ft CW
D. M = 3120 lb-ft CCW

Answer: Option D

Explanation:

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27. 

A twist of 4 N-m is applied to the handle of the screwdriver. Resolve this couple moment into a pair of couple forces F exerted on the handle.

A. P = 20 N
B. P = 10 N
C. P = 800 N
D. P = 1600 N

Answer: Option C

Explanation:

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28. 

Replace the force F, having a magnitude of F = 40 lb and acting at B, by an equivalent force and couple moment at A.

A. F = (32i-24k) lb, M = (-120i+96j-160k) lb-ft
B. F = (32i-24k) lb, M = 233k lb-ft
C. F = (32i-24k) lb, M = -72k lb-ft
D. F = (32i-24k) lb, M = (-120i+160j+40k) lb-ft

Answer: Option A

Explanation:

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29. 

The resultant force of a wind loading acts perpendicular to the face of the sign as shown. Replace this force by an equivalent force and couple moment acting at point O.

A. F = -120i lb, M = (-3000j+1800k) lb-ft
B. F = -120i lb, M = 3500i lb-ft
C. F = -120i lb, M = -3500j lb-ft
D. F = -120i lb, M = 3500k lb-ft

Answer: Option A

Explanation:

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30. 

Determine the magnitude and direction of the moment of the force at A about point P.

A. Mp = 143.5 ft-lb
B. Mp = 1191 ft-lb
C. Mp = 1104 ft-lb
D. Mp = 1200 ft-lb

Answer: Option C

Explanation:

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