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3 marksThermal Measurements

CSEC Physics · May/June 2005 · Paper 2 · Question 3(c)(ii)

A well-insulated hot water tank supplies hot water to a residential dwelling. The immersion heating element has a power rating of 2200 W, and the tank contains 125 kg of water at 28°C.

Calculate the heat energy supplied to the water, given that its temperature increases to 58°C. [specific heat capacity of water is 4200 J kg⁻¹ K⁻¹]

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Other parts of this question

  1. 3(a)Define the 'heat capacity of a substance' and state its SI unit.[3 marks]
  2. 3(b)Name the THREE modes of heat transfer.[3 marks]
  3. 3(c)(i)Calculate the heat energy supplied by the heating element in 2 hours.[3 marks]
  4. 3(c)(iii)Calculate the heat capacity of the tank, assuming that the tank and the water reach the same final temperature of 58°C.[3 marks]

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