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Sample Examples ˗ Modified Format ˗ Statics Problems

Example 1: A slender rod of weight, W, and of length 225 mm is placed in a pipe with an

inside diameter of 75 mm. The points of contact of the pipe with the pipe are at A and B.

The coefficient of static friction between the rod and the pipe is 0.20. Determine the smallest value

of θ for which the rod will not fall out of the pipe.

Which of the following are true?

a. θ = 30^o b. θ < 30^o c. θ = 20.5^o d. θ = 25.5^o e. None of these

Example 2: Find the forces in truss members, BD and AE and indicate if they are in tension

or in compression. Also identify any zero-force members.

Which of the following are true?

a. F_BD = 800N in compression b. F_BD = 800N in tension c. F_AE = 800N in tension

d. F_BD = 800N in compression e. CD is a zero force member f. No zero force members