Four different cranes lift loads to the top of the same building.
| Crane | Mass of load (kg) | Time taken (s) |
|---|---|---|
| A | 120 | 8 |
| B | 150 | 12 |
| C | 180 | 10 |
| D | 200 | 12 |
For which crane is the useful power developed the greatest?
A
B
C
D
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.