1. Extended tier only

Fig. 2.1 shows a submarine. The submarine is fully submerged in the sea.

(i) The atmospheric pressure is 100 kPa and the total pressure on the top surface of the submarine is 500 kPa.

Calculate the depth of the top surface of the submarine below the surface of the sea.

depth = ......................................................... [3]

(ii) A hatch (an opening door) on the top surface of the submarine has an area of 0.62 m².

Calculate the downward force on the hatch due to the total pressure on the top surface of the submarine.

force = ......................................................... [2]