An archaeologist is examining a shipwreck and spots a wooden box resting on the seabed. Fig. 4.1 depicts the sea surface, with a wooden box and lid 15 m beneath it. The lid measures 1.2 m by 0.80 m. Atmospheric pressure is $1.0 \times 10^{5}\,\text{Pa}$.
(a(i))[2]
Calculate the pressure on the lid of the box caused by the sea-water.
(a(ii))[1]
Calculate the total pressure on the lid.
(a(iii))[2]
Calculate the downward force that the total pressure produces on the lid.
(b)[2]
Suggest two reasons for this.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The formula is $P = h \rho g$ (or $hpg$).” …