A student measures the power developed when climbing stairs. The student uses the distance along the slope instead of the vertical height and records a time that is shorter than the actual time. How do these two errors affect the calculated power?
The distance error lowers power; the time error raises it.
The distance error raises power; the time error lowers it.
The distance error raises power; the time error raises it.
The distance error lowers power; the time error lowers it.
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.