CAIE IGCSE Physics Geometry, Measurement and Unit Conversion

Review CAIE IGCSE Physics geometry, measurement and unit conversion through density-based volume calculations and physical-context unit handling.

Exam points

calculate volume from mass and density with correct units in a physical context

[Maximum number: 2]

Fig. 3.1 shows a model of a wind turbine used to demonstrate the use of wind energy to generate electricity. The wind is blowing towards the model, as shown.

Fig. 3.1

The density of air is $1.3 \mathrm{~kg} / \mathrm{m}^{3}$ .

Calculate the volume of air passing through the circular area swept out by the turbine blades each second.

volume =

$\rho=\mathrm{m} / \mathrm{V}$ in any form $\mathrm{OR}(\mathrm{V}=) \mathrm{m} / \rho$ $\text { OR (V = )7.5 / } 1.3$

C1

$(\mathrm{V}=7.5 / 1.3=) 5.8 \mathrm{~m}^{3}$

A1

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7.3.2 Geometry, measurement and unit conversion question 1