The mass of air hitting the blades of a wind turbine each second is 2.4 × 104 kg.
The speed of the air is 5.0 m/s.
The density of air is 1.2 kg/m3.
Which row in the table gives the volume of the air hitting the blades each second and the kinetic energy of this air?
| Volume of air each second / m3\text{m}^3m3 | Kinetic energy each second / J\text{J}J | |
|---|---|---|
| A | 20 00020\,00020000 | 300 000300\,000300000 |
| B | 20 00020\,00020000 | 600 000600\,000600000 |
| C | 28 80028\,80028800 | 300 000300\,000300000 |
| D | 28 80028\,80028800 | 600 000600\,000600000 |
Row A
Row B
Row C
Row 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.