Part-—B
Answer two questions from each set
SET 1 Answer any 2 questions. Each question carries 10 Marks (2 X 10 = 20 Marks)
9. Forces of ISN, 20N, 25N, 35N and 45N act at an angular point of a regular hexagon
towards the other angular points as shown in figure 2. Calculate the magnitude and

direction of the resultant force.

Fig.2

10. A rigid bar AB is acted upon by forces as shown in figure 3. Reduce the force system to

(i) a single force (ii) force moment system at A (iii) force moment system at D

of ‏ا‎ 8k

A ° Cc B
4m 4m 3m

8kN 12kN

Fig.3
11. Determine the reactions at supports A and B of the beam as shown in the figure 4.
tak. KN