Physics 9702/21 — May/June 2013

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

questions

marks

minutes

Topics Physical Quantities and Units · Deformation of Solids · Dynamics · Work, Energy and Power · Forces, Density and Pressure · Superposition · +4 more

Q1Deformation of SolidsPhysical Quantities and UnitsFree sample

Energy is stored in a metal wire that is extended elastically.

(a)

Explain what is meant by extended elastically.

(b)

Show that the SI units of energy per unit volume are $\text{kg m}^{-1} \text{ s}^{-2}$ .

(c)

For a wire extended elastically, the elastic energy per unit volume $X$ is given by

X = C\varepsilon^2E

where $C$ is a constant,
$\varepsilon$ is the strain of the wire,
and $E$ is the Young modulus of the wire.

Show that $C$ has no units.

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6 more questions

Q2Dynamics · Physical Quantities and Units9M
Q3Work, Energy and Power11M
Q4Forces, Density and Pressure7M
Q5Superposition · Waves11M
Q6Electricity · D.C. Circuits9M
Q7Particle Physics6M

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