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Thermal Energy Transfers · Paper 2 — Free Physics HL Practice Questions
1ChallengeSAQ-LHeat and temperature7 marksPaper 2~11 min
A 0.200 kg block of metal at 100 °C is placed into 0.500 kg of water at 20.0 °C in a well-insulated container. The final equilibrium temperature of the system is measured as 26.5 °C. The specific heat capacity of water is 4200 J kg K.
(a)
Determine the specific heat capacity of the metal. [3 marks]
(b)
Explain why the final equilibrium temperature is closer to the initial temperature of the water than to that of the metal. [2 marks]
(c)
State one reason why the assumption that the container is perfectly insulated is not valid in practice. [1 mark]
(d)
Deduce whether the value of the specific heat capacity calculated in (a) is an overestimate or an underestimate if the container is not perfectly insulated. [1 mark]
Solutions
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