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# Engineering Mechanics - Structural Analysis

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### Exercise

• General Questions
"Weakness of attitude becomes weakness of character."
- Albert Einstein
1.

Determine the force in each member of the truss and indicate whether the members are in tension or compression.

 A. CB = 447 N C, CD = 200 N T, DB = 800 N C, DE = 200 N T, BE = 447 N T, BA = 894 N C, AE = 800 N T B. CB = 447 N T, CD = 200 N C, DB = 800 N T, DE = 200 N C, BE = 447 N C, BA = 894 N T, AE = 800 N C C. CB = 894 N T, CD = 800 N C, DB = 800 N T, DE = 800 N C, BE = 894 N C, BA = 1789 N T, AE = 800 N C D. CB = 894 N C, CD = 800 N T, DB = 800 N C, DE = 800 N T, BE = 894 N T, BA = 1789 N C, AE = 800 N T

2.

The principles of a differential chain block are indicated schematically in the figure. Determine the magnitude of force P needed to support the 800-N force. Also compute the distance x where the cable must be attached to bar AB so the bar remains horizontal. All pulleys have a radius of 60 mm.

 A. P = 80 N, x = 240 mm B. P = 80 N, x = 180 mm C. P = 40 N, x = 180 mm D. P = 40 N, x = 240 mm

3.

Determine the magnitude of the forces in pins B and D of the four-member frame.

 A. B = 503 lb, D = 225 lb B. B = 225 lb, D = 503 lb C. B = 56.3 lb, D = 125.8 lb D. B = 125.8 lb, D = 112.5 lb

4.

Determine the force in members FF, FB, and BC of the Fink truss and indicate whether the members are in tension or compression.

 A. BF = 693 lb T, FG = 1800 lb C, BC = 1212 lb T B. BF = 8660 lb C, FG = 3600 lb C, BC = 1212 lb T C. BF = 3810 lb T, FG = 3600 lb C, BC = 1212 lb T D. BF = 1732 lb T, FG = 2400 lb C, BC = 1212 lb T

5.

The floor beams AB and BC are stiffened using the two tie rods CD and AD. Determine the force along each rod. Assume the three contacting members at B are smooth and the joints at A, C, and D are pins.

 A. T = 480 lb B. T = 520 lb C. T = 1248 lb D. T = 1152 lb