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CAIE IGCSE Physics 1.8.4 Recall/use: for the change in pressure

Practise using ∆p = ρg∆h for liquids, including water columns, dams and underwater objects with Pa, kg m^-3 and m data.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • calculate pressure change from ρg∆h, converting cm to m before substitution
  • rearrange ∆p = ρg∆h to find depth or density from liquid pressure data
  • distinguish pressure due to a liquid from total pressure when atmospheric pressure is included

1.8.4—Recall/use: for the change in pressure question 1

[Maximum number: 2]

All the sides of a plastic cube are 8.0 cm long. Fig. 3.1 shows the cube.

Fig. 3.1 (not to scale)

Fig. 3.1 (not to scale)

The mass of the cube is 0.44 kg .

On the Moon, the weight of the cube is 0.70 N .

In a laboratory on the Moon, the plastic cube is held stationary, using a clamp, in a beaker of the oil of density 850 kg/m3850 \mathrm{~kg} / \mathrm{m}^{3}.

The arrangement is shown in Fig. 3.2.

Fig. 3.2

Fig. 3.2

The lower face of the cube is 3.0 cm below the surface of the oil.

Use your answer to (c)(i) to calculate the pressure due to the oil on the lower face of the cube.
pressure =
[Total: 8]

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