81. The centre of gravity of a triangle is at the point where three
82. If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is
83. A ball of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/sec hits an identical stationary ball ‘B’ on the table. If the impact is perfectly plastic, the velocity of the ball ‘B’ just after impact would be
84. Ball ‘A’ of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball ‘B’ on the table. If the impact is perfectly elastic, the velocity of the ball ‘B’ just after impact would be
85. The diagram showing the point of application and line of action of forces in their plane is called
86. One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The reaction between the sphere and the wall of the arrangement made is
87. A rigid body suspended vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called
88. When a body falls freely under gravitational force, it possesses
89. Moment of inertia of a squares of side ‘b’ about an axis through its centre of gravity, is
90. When two forces, each equal to P, act at 90° to each other, then the resultant will be
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