51. In ideal machines, mechanical advantage is __________ velocity ratio.
52. The minimum force required to slide a body of weight W on a rough horizontal plane is
53. The moment of inertia of a square of side a about its diagonal is
54. The angular velocity (in rad / s) of a body rotating at N revolutions per minute is
55. The maximum efficiency of a lifting machine is
56. The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.
57. The process of finding out the resultant force is called __________ of forces.
58. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
59. In a framed structure, as shown in the below figure, the force in the member BC is
60. The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.
61. If a number of forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are not in equilibrium.
62. The periodic time of a particle with simple harmonic motion is __________ proportional to the angular velocity.
63. The motion of a particle round a fixed axis is
64. A block of mass m1, placed on an inclined smooth plane is connected by a light string passing over a smooth pulley to mass m2, which moves vertically downwards as shown in the below figure. The tension in the string is
65. If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.
66. The principle of transmissibility of forces states that, when a force acts upon a body, its effect is
67. A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is
68. If three forces acting at a point are represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are in equilibrium.
69. Newton's second law motion __________ a relation between force and mass of a moving body.
70. There are ..........ports in Kerala?
71. The 'Queen of Arabian Sea’ is?
72. Which of the following are vector quantities?
73. The maximum acceleration of a particle moving with simple harmonic motion is
74. A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero.
75. Non-coplaner concurrent forces are those forces which