A-LevelPhysicsPhysical quantities and unitsOct/Nov 2021Paper 2 Q111 Marks
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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