Physics (AS & A Level) · May / June 2025 · Paper 41 · Question 5

A cuboidal block floats in a liquid with its base horizontal, as shown in Fig. 5.1. block liquid surface h Fig. 5.1 The base of the block is at a depth h below the surface of the liquid. The block is displaced downwards by a small distance and then released so that it oscillates. Fig. 5.2 shows the variation with h of the acceleration a of the block. 1.0 0 –1.0 0 0.4 0.8 1.2 1.6 2.0 2.4 h / m a / m s–2 Fig. 5.2 Fig. 5.3 shows the variation with h of the kinetic energy EK of the block. 10 5 0 0 0.4 0.8 1.2 1.6 2.0 2.4 h / m EK / J Fig. 5.3

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