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6 marksFirst Law of Thermodynamics

CAPE Physics Unit 1 · 2009 · Paper 2 · Question 6(a)(i)

Write down an equation for the First Law of Thermodynamics clearly explaining the meaning of the symbols used.

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  1. 6(a)(ii)Explain why the heat capacity of a gas at constant pressure, Cp, is greater than the heat capacity of the gas at constant volume, Cv. Write down an expression…[6 marks]
  2. 6(b)(i)Using data from the graph, calculate the number of moles of gas.[3 marks]
  3. 6(b)(ii)a)Using data from the graph, calculate the quantity of heat required to take the gas from C to A along CA.[2 marks]
  4. 6(b)(ii)b)Using data from the graph, calculate the quantity of heat required to take the gas from C to B along CB.[2 marks]
  5. 6(b)(iii)Using data from the graph, calculate the work done by the gas along the path from C to B.[2 marks]

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