Physics 5054/31 — October/November 2013

Cambridge O-Level · Practical Test · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Observations and Measurements · Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials

Q15MObservations and MeasurementsExperimental ContextsUse of Techniques, Apparatus and MaterialsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will determine the density of the rubber from which a stopper (bung) is made.

You have been provided with

You also have access to a top-pan balance.

Fig. 1.1 shows the stopper.

Fig. 1.1

(a)

Determine, for the stopper, average values for

(i) the smallest diameter $d_1$ ,

$d_1$ = ______

(ii) the largest diameter $d_2$ ,

$d_2$ = ______

(iii) the height $h$ .

$h$ = ______

(b)

State and explain a precaution that you took to ensure that your values of $d_1$ and $d_2$ were as accurate as possible.

(c)

(i) Use the top-pan balance to measure the mass $m$ of the stopper.

$m$ = ______

(ii) Calculate $z$ , where

z = \frac{d_1 + d_2}{4}

$z$ = ______

(iii) Calculate an approximate value of the density $\rho$ of the rubber using

\rho = \frac{m}{\pi z^2 h}

$\rho$ = ______

The rest of this paper

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