A parcel-sorting conveyor has two operating settings. The data for setting R and the changes made for setting T are shown in the table.
| Quantity | Setting R | Setting T compared with setting R |
|---|---|---|
| total energy supplied per cycle | 800 J | 25% lower |
| useful energy transferred per cycle | 480 J | 10% lower |
A setting meets the operating requirements if its efficiency is at least 70% and it dissipates no more than 200 J per cycle.
Which gives the correct conclusion?
both settings meet both requirements
neither setting meets both requirements
only setting T meets both requirements
only setting R meets both requirements
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.