A circular opening, 6m diameter, in a vertical side of a tank is closed by a disc of 6m diameter which can rotate about a horizontal diameter. Calculate the force on the disc. The centre of circular opening is at the depth of 5 m.

A circular opening, 6m diameter, in a vertical side of a tank is close

1.	A circular opening, 6m diameter, in a vertical side of a tank is closed by a disc of 6m diameter which can rotate about a horizontal diameter. Calculate the force on the disc. The centre of circular opening is at the depth of 5 m.
A.	1.38 MN
B.	2.76 MN
C.	5.54 MN
D.	7.85 MN
Answer» B. 2.76 MN