10

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b) Define couple and explain its characteristics. With the help of a sketch, explain how a

41104 Pages: 4

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Members OA,OB and OC form a three member space truss. A weight of 10 KN is
suspended at the joint O. Determine the magnitude of forces induced in each of the
three member of the truss.

1011

Find the reactions at the supports A(hinged) and B (roller).
ST ABT: 90/1

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A
6m em 25m 1.57

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force can be resolved into a force and a couple.

SET II
(ANSWER ANY 2 QUESTIONS: 2 X 10 = 20 MARKS)

A ladder AB 3m in length and weighing 180N, is placed against a wall with A at the
floor level and B on the wall.The ladder is inclined at an angle of 60° with the floor.
The coefficient of friction between the wall and the ladder is 0.25 and that between
floor and the ladder is 0.35.In addition to the self weight of the ladder, it has to support

aman weighing 900N,at the top ए. To prevent slipping a force is applied horizontally

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