Engineering Mechanics - Force System Resultants

Exercise :: Force System Resultants - General Questions

  • Force System Resultants - General Questions
21. 

Determine the magnitude and direction of the couple shown.

A. M = 22.6 kN-m CCW
B. M = 22.6 kN-m CW
C. M = 21.9 kN-m CCW
D. M = 21.9 kN-m CW

Answer: Option C

Explanation:

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22. 

Three parallel forces act on the rim of the tube. If it is required that the resultant force FR of the system have a line of action that coincides with the central z axis, determine the magnitude of FC and its location on the rim. What is the magnitude of the resultant force FR?

A. Fc = 361 lb, = 56.3°, R = 861 lb
B. Fc = 500 lb, = 54.0°, R = 1000 lb
C. Fc = 500 lb, = 36.0°, R = 1000 lb
D. Fc = 361 lb, = 36.9°, R = 861 lb

Answer: Option A

Explanation:

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23. 

A force of 50 N is applied to the handle of the door as shown. Determine the projection of the moment of this force about the hinged axis z. Neglect the size of the doorknob. Suggestion: Use a scaler analysis.

A. Mz = 15.9 N-m
B. Mz = -15.9 N-m
C. Mz = -27.6 N-m
D. Mz = 27.6 N-m

Answer: Option B

Explanation:

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24. 

The wind has blown sand over a platform such that the intensity of load can be approximated by the function . Simplify this distributed loading to a single concentrated force and specify the magnitude and location of the force measured from A.

A. R = 1250 N, x = 6.67 m
B. R = 2500 N, x = 6.67 m
C. R = 1250 N, x = 8 m
D. R = 2500 N, x = 8 m

Answer: Option C

Explanation:

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25. 

The pole supports a 22-lb traffic light. Using Cartesian vectors, determine the moment of the weight of the traffic light about the base of the pole at A.

A. MA = 216k lb-ft
B. MA = (-132i-229j-216k) lb-ft
C. MA = (-229i+121j) lb-ft
D. MA = (-132i+229j) lb-ft

Answer: Option C

Explanation:

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