【单选题】A right-circular cylinder, open at the top, is filled with liquid, and rotated about its vertical axis at such speed that half the liquid spills out.The pressure intensity at the center of the bottom ...
A.
(a) zero
B.
(b) one-fourth its value when cylinder was full
C.
(c) indeterminable; insufficient data
D.
(d) greater than a similar case with water as liquid