A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the centre of bottom is -

- 1
  
  zero
- 2
  
  one-fourth its value when cylinder was full
- 3
  
  one half its value when cylinder was full
- 4
  
  cannot be predicted from the given data

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