Q.
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:
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a
rω2g
b
r2ω22g
c
2grω
d
ω22gr2
answer is B.
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Detailed Solution
From Bernoulli’s theorem,PA+12dvA2+dghA =PB+12dvB2+dghBHere, hA=hB∴ PA+12dvA2=PB+12dvB2PA−PB=12d[vB2−vA2]Now, vA=0 , vB=rω and PA−PB=hdg∴ hdg=12dr2ω2 or h=r2ω22g
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