A stage lift raises a section of the stage floor, together with the scenery standing on it, during a scene change.
The table gives information about the stage lift during the scene change.
| total mass raised | vertical height raised | ratio of useful energy transferred to energy dissipated | mean input power |
|---|---|---|---|
| 1200 kg | 2.5 m | 10:310:310:3 | 1.3 kW |
The gravitational field strength g g\,g is 10 N/kg.
Calculate the time taken for the stage lift to raise the stage floor.
128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.