1. A vertical circular gate in a tunnel 8 m in diameter has oil (sp. gr. o.80) on one side and air on the other side as shown in Figure. If oil is 12 m above the invert and the air pressure is 40 kPa, where will a single support be located to hold the gate in position (above the invert of the gate)? Oil 12 m Air 8 m Invert

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