Q. The phenomenon of collision of two elastic bodies takes place because bodies

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Q. A retarding force on a body does not

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Q. The unit of force in C.G.S. system of units, is called

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Q. A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is

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Q. From a circular plate of a diameter 6 cm is cut out a circle whose diameter is equal to the radius of the plate. The C.G. of the remainder from the centre of circular plate is at a distance of

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Q. The force which produces an acceleration of 1 m/sec² in a mass of one kg, is called

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Q. If a spherical body is symmetrical about its perpendicular axes, the moment of inertia of the body about an axis passing through its centre of gravity as given by Routh's rule is obtained by dividing the product of the mass and the sum of the squares of two semi-axes by n where n is

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Q. The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be

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Q. A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses

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Q. Varigon's theorem of moments states

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Q. One half of a vibration of a body, is called

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Q. On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts

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Q. The acceleration of a particle moving along the circumference of a circle with a uniform speed, is directed

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Q. From the circular plate of a diameter 6 cm is cut out a circular plate whose diameter is equal to radius of the plate. The c.g. of the remainder shifts from the original position through

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Q. A glass ball is shot to hit a wall from a point on a smooth floor. If the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is

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Q. Kinetic friction may be defined as

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Q. ω rad/sec is the angular velocity of a crank whose radius is r. If it makes θ° with inner dead centre and obliquity of the connecting rod l is φ, the velocity v of the piston, is given by the equation

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Q. According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centres lie on

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Q. 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

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Q. If two forces each equal to T in magnitude act at right angles, their effect may be neutralised by a third force acting along their bisector in opposite direction whose magnitude will be

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