Physics 9702/22 — October/November 2017

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

questions

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Topics Physical Quantities and Units · Deformation of Solids · Forces, Density and Pressure · Electricity · Measurement Techniques · Dynamics · +6 more

Q1Measurement TechniquesPhysical Quantities and UnitsDeformation of SolidsFree sample

One end of a wire is connected to a fixed point. A load is attached to the other end so that the wire hangs vertically.

The diameter $d$ of the wire and the load $F$ are measured as

\begin{aligned} d &= 0.40 \pm 0.02\ \text{mm}, \\ F &= 25.0 \pm 0.5\ \text{N}. \end{aligned}

(a)

For the measurement of the diameter of the wire, state

(i)

the name of a suitable measuring instrument.

(ii)

how random errors may be reduced when using the instrument in (i).

(b)

The stress $\sigma$ in the wire is calculated by using the expression

\sigma = \frac{4F}{\pi d^2}.

(i)

Show that the value of $\sigma$ is $1.99 \times 10^8\ \text{N m}^{-2}$ .

(ii)

Determine the percentage uncertainty in $\sigma$ .

percentage uncertainty = ______ %

(iii)

Use the information in (b)(i) and your answer in (b)(ii) to determine the value of $\sigma$ , with its absolute uncertainty, to an appropriate number of significant figures.

$\sigma$ = ______ $\pm$ ______ $\text{N m}^{-2}$

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6 more questions

Q2Forces, Density and Pressure5M
Q3Forces, Density and Pressure · Dynamics · Deformation of Solids12M
Q4Superposition · Waves8M
Q5Electricity · Electric Fields · Physical Quantities and Units · Kinematics9M
Q6Electricity12M
Q7Particle Physics · Work, Energy and Power6M

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