Answer all the questions in the spaces provided.

(b) A smooth pebble, made from uniform rock, has the shape of an elongated sphere as shown
in [Fig. 1.1].

The length of the pebble is L. The cross-section of the pebble, in the plane perpendicular to L,
is circular with a maximum radius r.

A student investigating the density of the rock makes measurements to determine the values
of L, r and the mass M of the pebble as follows:

L = (0.1242 ± 0.0001)m
r = (0.0420 ± 0.0004) m
M = (1.072 ± 0.001)kg.

This question tests Physical quantities and units in A-Level Physics (syllabus code 9702). It is worth 11 marks.

This question appeared in the Cambridge A-Level Physics Oct/Nov 2021 examination, Paper 2 Variant 1 (9702_w21_qp_21.pdf).

Question

Answer all the questions in the spaces provided.

(b) A smooth pebble, made from uniform rock, has the shape of an elongated sphere as shown
in [Fig. 1.1].

The length of the pebble is L. The cross-section of the pebble, in the plane perpendicular to L,
is circular with a maximum radius r.

A student investigating the density of the rock makes measurements to determine the values
of L, r and the mass M of the pebble as follows:

L = (0.1242 ± 0.0001)m
r = (0.0420 ± 0.0004) m
M = (1.072 ± 0.001)kg.

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