2.2.3. Melting, boiling and evaporation
A subsection of Physics, 5054, through 2. Thermal physics
Listing 10 of 166 questions
shows a small swimming pool containing water. 4.0m 2.1m The depth of water in the pool is 0.80 m. The density of water is 1000 kg / m3. Show that the mass of water in the pool is approximately 6700 kg. Define ‘pressure’. Calculate the pressure on the base of the pool due to the water. pressure = Pa The water in the pool is initially at a temperature of 10 °C. The temperature rises when 5.1 × 108 J of energy is transferred to the water. The specific heat capacity of water is 4200 J / (kg °C). Calculate the final temperature of the water. temperature = °C Explain, in terms of the movement of particles, how evaporation causes cooling. Changes to factors in the environment of the swimming pool can cause an increase or decrease in the amount of evaporation from the surface of the water. State two changes to environmental factors that increase the amount of evaporation from the surface of the water.
5054_s24_qp_22
THEORY
2024
Paper 2, Variant 2
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shows a cylindrical copper kettle that contains cold water. X copper cold water heater cable The kettle is used to heat water and there is an electric heater at the base. State and explain the advantage of heating the water from below. As the water is heated, it expands. Explain, in terms of molecules, why water expands when it is heated. Copper also expands when heated. State what happens to level X of the water in the kettle. Explain your answer in terms of the expansion of the copper and the water.
5054_w18_qp_22
THEORY
2018
Paper 2, Variant 2
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Questions Discovered
166