A student heats a 1.0 kg aluminium block using an electric heater. A joulemeter measures the energy transferred to the heater.
Her results are:
Calculate the change in temperature of the block.
Use the equation: change in thermal energy=mass×specific heat capacity×change in temperature\text{change in thermal energy} = \text{mass} \times \text{specific heat capacity} \times \text{change in temperature}change in thermal energy=mass×specific heat capacity×change in temperature
Calculate the specific heat capacity of aluminium from the student's results.
Give the unit.
The accepted value for the specific heat capacity of aluminium is 900 J/kg ∘C900\ \text{J/kg}\ ^\circ\text{C}900 J/kg ∘C.
Explain why the student's value is higher than the accepted value.
Suggest one change to the method that would make the student's value closer to the accepted value.
44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.