Two electric go-karts are tested on a track. In each run, a go-kart accelerates from rest. The useful output is the energy transferred to the kinetic energy store of the go-kart. Only the energy transfers while the go-karts accelerate are considered: ignore any energy transfers while they slow down or between runs.
| Go-kart | Useful energy transferred in each run | Efficiency | Number of runs in one hour |
|---|---|---|---|
| A | 12 kJ | 0.80 | 20 |
| B | 9.0 kJ | 0.60 | 16 |
Calculate, in its simplest form, the ratio of the total energy dissipated by go-kart A to the total energy dissipated by go-kart B during their accelerations in the hour.
100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.