A 15-cm-diameter, 40-cm-high vertical cylindrical container is partially filled with 25-cm-high water. Now the cylinder is rotated

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A 15-cm-diameter, 40-cm-high vertical cylindrical container is partially filled with 25-cm-high water. Now the cylinder is rotated at a constant speed of 20 rad/s. The maximum height difference between the edge and the center of the free surface is

(a) 15 cm 

(b) 7.2 cm 

(c) 5.4 cm 

(d) 9.5 cm 

(e) 11 .5 cm

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