A concrete cube 60 cm on each edge (sp. gr. 2.40)  rests on the bottom of a tank in which sea water  stands to a depth of 5 m. The bottom edges of the  block and sealed off so that no water is admitted  under the block. Find the vertical pull required to  lift the block.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A concrete cube 60 cm on each edge (sp. gr. 2.40) 
rests on the bottom of a tank in which sea water 
stands to a depth of 5 m. The bottom edges of the 
block and sealed off so that no water is admitted 
under the block. Find the vertical pull required to 
lift the block. 

Note: The answer should be 13.76 kN or near.

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