A circular cylinder of radius R and height H is filled with water to a height (2/3)H. It starts rotating with constantly increasing angular speed.
Choose the correct alternatives
a) At all speeds, shape of the free surface is parabolloid
b) The free surface touches first the brim of the cylinder and then the base of the cylinder
c) The free surface cannot touche the brim of the cylinder without spilling water
d) The free surface touches the brim of the cylinder as well as the base of the cylinder simultaneously
Answer a,b,c
Kindly explain
