Physics 9702/21 — May/June 2016

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

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Topics Physical Quantities and Units · Forces, Density and Pressure · Kinematics · Dynamics · Deformation of Solids · Waves · +4 more

Q1Physical Quantities and UnitsForces, Density and PressureFree sample

Answer all the questions in the spaces provided.

(a)

Make estimates of

(i)

the mass, in kg, of a wooden metre rule,

mass = ______ $\text{kg}$

(ii)

the volume, in $\text{cm}^3$ , of a cricket ball or a tennis ball.

volume = ______ $\text{cm}^3$

(b)

A metal wire of length $L$ has a circular cross-section of diameter $d$ , as shown in Fig. 1.1.

Fig. 1.1

The volume $V$ of the wire is given by the expression

V = \frac{\pi d^2 L}{4}

The diameter, length and mass $M$ are measured to determine the density of the metal of the wire. The measured values are:

$d = 0.38 \pm 0.01\ \text{mm}$ ,
$L = 25.0 \pm 0.1\ \text{cm}$ ,
$M = 0.225 \pm 0.001\ \text{g}$ .

Calculate the density of the metal, with its absolute uncertainty. Give your answer to an appropriate number of significant figures.

density = ______ $\pm$ ______ $\text{kg m}^{-3}$

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