Exercise: Structural Analysis

Questions for: Structural Analysis

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
Answer: D
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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
Answer: D
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