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