C

11. A system of parallel forces is acting on a rigid bar as shown in Fig.5. Reduce this system
to a) a single force b) a single force and a couple at A.

32.5 N 150N 67.5N 10N
A | [71 | Im | 1.5m |B
Fig.5
SET 2

Answer any 2 questions. Each question carries 10 Marks (2 X 10 = 20 Marks)
12. Find the centroid of the given Fig.6.

100 mm

50mm

|. 15000) | 150 mm |

Fig.6
13. A uniform ladder of 4m length rests against a wall which it makes an angle 45° as shown in
Fig.7. The coefficient of friction between the ladder and the wall is 0.4 and that between the
ladder and floor is 0.5. If the man whose weight is on half of that of ladder ascends it, how high

will he when the ladder slips?

Fig.7