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Complete the sentences about the process shown in Fig. 8.2. The piston is pushed down. This causes the of the gas to decrease. The gas remains at constant temperature. The pressure of the
See it on the paper →Explain why the force exerted by the gas on the bottom of the cylinder increases. Use ideas about particles in your answer.
See it on the paper →The man stands up. There is a mark in the sand to show where he was lying. When he stands up, his feet make deeper marks in the sand. Explain why the marks are deeper in the sand when he is standing.
See it on the paper →The man stands up. Pressure from his feet leaves deep footprints in the sand. The surface area of one foot is 155 cm 2 . The mass of the man is 75 kg. The gravitational field strength g is 10 N / kg. Calculate the pressure he exerts on the sand when he stands on two feet. pressure = Pa
See it on the paper →How is the energy transferred through the pan and then throughout the water?
See it on the paper →Credit for stating ‘volume’ was very frequently awarded. The idea of the separation between molecules was accepted as an alternative. Common incorrect answers included ‘area’, ‘space’ and references to molecular speed.
— Examiner report, February/March 2025, 0653/42 Q8(c)(i) (Cambridge)
Most candidates found this question challenging. Candidates had to make the point that gas pressure arises through particle collision with the walls of the container. The question stated that the temperature remains constant, but many candidates suggested that the kinetic energy of the particles increased which was the reason for increased force when particles collided with the container. Many ans...
— Examiner report, February/March 2025, 0653/42 Q8(c)(ii) (Cambridge)
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