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6. A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is r and angular velocity of rotation is ω , then the difference in the heights of the liquid at the centre of the vessel and the edge is

(a)  (rω)/(2g)                        (b)  (r2 ω2 )/(2g)

(c)  √2grω                              (d) (ω2 /(2gr2 )

Answer-b

(32)

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