39) Two forces 10 N and 15 N act at a point. If angle between the line of action of the forces is 60 %, then magnitude of result force is

40) A crowbar 2 m long supported on a stone is used for lifting a weight of 120 kg. If the effort applied at the other end is 40 kg, find out the distance of support from load.

41) The BCD number for decimal 347 is

42) A body of weight 100 N lies on a horizontal plane for which coefficient of friction (CoF) is 0.75. Find (a) normal reaction, (b) limiting force of friction, (c) horizontal force required to move.

43) Bulk modulus is directly proportional to ____ and inversely proportional to _____