Q2 of 28 Page 50

Which of the following points is the likely position of the centre of mass of the system shown in Fig. 7.1?


According to the question hollow sphere and sand has equal volume i.e half the volume of sphere. But as

Mass of sand ≫ Mass of air


So, as the mass of sand is quite larger as compared to air. Hence the net centre of mass will be shifted downward (toward sand side).


Hence option c is correct.

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A particle of mass m is moving in yz-plane with a uniform velocity v with its trajectory running parallel to +ve y-axis and intersecting z-axis at z = a (Fig. 7.2). The change in its angular momentum about the origin as it bounces elastically from a wall at y = constant is:


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When a disc rotates with uniform angular velocity, which of the following is not true?

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