36) The center of percussion of the homogeneous rod of length L suspended at the top will be

37) The center of gravity of a triangle lies at the point of

38) The possible loading in various members of framed structures are

39) A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve

40) A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span