Quelpr
8 marksHeat Transfer

CAPE Physics Unit 1 · 2002 · Paper 2 · Question 8(a)(iii)

Equipment allows high-temperature steam to be blown through pipe A, causing a light frictionless piston at D to push on switch E. Initially, the equipment is at 25°C. Steam is blown through pipe A.

Why must the copper rod be lagged and the piston light and frictionless?

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 8(a)(i)Name the process by which heat is supplied to the gas at C via the copper rod at B.[8 marks]
  2. 8(a)(ii)Use the kinetic theory to explain why the piston at D eventually pushes on the switch at E.[8 marks]
  3. 8(b)(i)Calculate an estimate for the change of internal energy of the gas at C.[9 marks]
  4. 8(b)(ii)Why is the actual value for the change of internal energy of the gas at C lower than the value you calculated in (b)(i) above.[9 marks]
  5. 8(b)(iii)a)Calculate the number of moles of helium atoms in the container.[9 marks]
  6. 8(b)(iii)b)Calculate the total kinetic energy of the helium atoms.[9 marks]
  7. 8(c)Explain what happens to the piston at D and why.[3 marks]

More practice: the rest of this paper · more Heat Transfer questions · all CAPE Physics Unit 1 past papers