51. The angle which an inclined surface makes with the horizontal when a body placed on it is on the point of moving down, is called
52. The resultant of two forces acting at right angles is $$\sqrt {34} \,$$ kg and acting at 60° is 70 kg. The forces are
53. The moment of inertia of a circular lamina of diameter ‘d’, about an axis perpendicular to the plane of the lamina and passing through its centre, is
54. A circular disc rotates at n rpm. The angular velocity of a circular ring of same mass and radius as the disc and to have the same angular momentum is
55. Instantaneous center is at infinity when the angular velocity is
56. A disc of mass 4 kg, radius 0.5 m and moment of inertia 3 kg.m2 rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is
57. A cable loaded with 0.5 tonne per horizontal metre span is stretched between supports in the same horizontal line 400 m apart. If central dip is 20 m, the minimum tension in the cable, will be
58. A simple pendulum of length L has an energy E when its amplitude is A. If its amplitude is increased to 2A, the energy becomes
59. A simple pendulum of length L has an energy E, when its amplitude is A. If the length of pendulum is doubled, the energy will be
60. If the horizontal range is 2.5 times the greatest height, the angle of projection of the projectile, is
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