# A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘ ’ is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period a) Decreases continuously b) Decreases initially and increases again c) Remains unaltered d) Increases continuously

## Question ID - 53136 :- A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass ‘ ’ is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period a) Decreases continuously b) Decreases initially and increases again c) Remains unaltered d) Increases continuously

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 (b) According to law of conservation of momentum constant When viscous fluid of mass is dropped and start spreading out then its moment of inertia increases and angular velocity decreases. But when it falls from the platform moment of inertia decreases so angular velocity increases again
 Out of the given bodies (of same mass) for which the moment of inertia will be maximum about the axis passing through its centre of gravity and perpendicular to its plane a) Disc of radius b) Ring of radius c) Square lamina of side d) Four rods of length making a square 