75) If n = number of members and j = number of joints, then for a perfect frame, n =

76) A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

77) A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to

78) Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one

79) A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal