CAIE A-Level Physics Supplied Data and Formulae

Practise selecting supplied CAIE A-Level Physics formulae and constants, then substituting consistent values to compare energies, networks and model equations.

Exam points

select supplied formulae appropriate to mechanics, electricity or other physical contexts
rearrange formulae, convert units and substitute values to calculate a physical quantity
interpret the variables, units and physical meaning of a formula result

Covered syllabus points

D.1-Supplied constants and data D.2-AS formulae supplied in Papers 1, 2 and 4 D.4-Choosing formulae without losing physical reasoning

[Maximum number: 1]

The diagram shows two resistor networks.

network 1

network 2

What is the ratio $\frac{\text { total resistance of network } 1}{\text { total resistance of network } 2} ?$

$\frac{4}{5}$

$\frac{5}{4}$

$\frac{1}{2}$

$\frac{2}{1}$

[Maximum number: 2]

The drag force $F_{\mathrm{D}}$ acting on a sphere falling through a liquid is given by

F_{\mathrm{D}}=6 \pi \eta r v

where r is the radius of the sphere,
v is the speed of the sphere in the liquid and
$\eta$ is a property of the liquid called the viscosity.

The sphere has a radius of 3.0 cm and is falling vertically downwards at a terminal velocity of $2.0 \mathrm{~ms}^{-1}$ through the liquid. The drag force acting on the sphere is 0.096 N .

Calculate the viscosity of the liquid.
viscosity = $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-1}$

viscosity $=0.096 /(6 \times \pi \times 0.03 \times 2.0)$

C1

$=0.085 \mathrm{~kg} \mathrm{~m}^{-1} \mathrm{~s}^{-1}$

A1

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Covered syllabus points

Supplied data and formulae question 1

Supplied data and formulae question 2