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A system of particles is called a rigid body,

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In pure rotation, all particles of the

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For n particles in a space, the suitable expression for the `x`-coordinate of the centre of mass of a system

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Two bodies of masses `1 kg and 2 kg` are lying on `x-y` plane at `(1, 2) and (- 1, 3)` respectively. What are the coordinates of centre of

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Centre of mass of the given system of particles will be

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A ball kept in a closed box moves in the box making collisions with the walls. The box is kept on a smooth surface. The velocity of the centre of

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If the torque of the rotational motion will be zero, then the constant quantity will

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If frictional force is neglected and girl bends her hand, then (initially girl is rotating on

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Assertion: Two identical spherical spheres are half filled with two liquids of densities `rho_1 and rho_2 ( > rho_1)`. The centre of mass of both the spheres lie at same level.Reason: The centre of mass does not lie at centre of the

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Assertion: For a system of particles under central force field, the total angular momentum is conserved. Reason: The torque acting on such a system is

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We cannot hear echo in a room.

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Two balls of different masses are thrown vertically upward with same initial speed. Which one will rise to a greater

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What is the relative velocity of two bodies having equal

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Write the characteristics of

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Shipra went from her home to school 2.5km away. On finding her home closed she returned to her home immediately. What is her net displacement? What is the total distance covered by

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What is the shape of the displacement time graph for uniform linear

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Prove that for elevations which exceed or fall short of `45^o` by equal amounts the ranges are

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Two vectors `vecA` and `vecB` are perpendicular to each other. What is the value of `vecA .vecB`

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A stone is thrown vertically upwards and then it returns to the thrower. Is it a projectile?

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Why does the direction of motion of a projectile become horizontal at the highest point of its

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