1.1. Complete the definition of hydrostatic pressure.

Hydrostatic pressure is the pressure that is exerted by a __________ at __________ at a given point within the fluid, due to the force of  __________.

1.2. A cylinder of length 1.8 m is submerged vertically in a tank of seawater so that the top of the cylinder is 0.2 m below the surface of the water, as shown in Fig. 1.1.

The density of the seawater is 1020 kg m⁻³.

Fig. 1.1.

Calculate the difference in hydrostatic pressure between the top and bottom surfaces of the cylinder.

1.3. The cylinder has a diameter of 75 cm.

Calculate the upthrust on the cylinder.

1.4. The seawater in Fig. 1.1. is replaced with pure water which has a lower density than seawater.

Without further calculation

(i) State and explain the effect this would have on the upthrust on the cylinder

[2]

(ii) Hence, state whether the cylinder would sink, float or stay at the same position in the tank.

[1]