An engineering workshop compares two covers used while identical steel rollers cool. The rollers have equal masses and are at the same temperature at the start of the measurements.
| Cover | Temperature after 4 min in ∘C^\circ\mathrm{C}∘C | Temperature after 9 min in ∘C^\circ\mathrm{C}∘C |
|---|---|---|
| A | 76 | 67 |
| B | 78 | not recorded |
Between 4 min and 9 min, the ratio of the mean rate of energy loss from roller A to the mean rate of energy loss from roller B is 3:23:23:2.
Which reading should be entered for roller B after 9 min?
69 ∘C69\ ^\circ\mathrm{C}69 ∘C
72 ∘C72\ ^\circ\mathrm{C}72 ∘C
75 ∘C75\ ^\circ\mathrm{C}75 ∘C
64.5 ∘C64.5\ ^\circ\mathrm{C}64.5 ∘C
110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.