A prototype wind turbine is installed inside an industrial ventilation shaft to harvest energy from flowing air.
Figure 1 shows a graph of kinetic energy against air speed for a constant mass of moving air flowing through the ventilation shaft.
| Air speed (m/s) | Kinetic energy (kJ) |
|---|---|
| 0 | 0.0 |
| 2 | 0.6 |
| 4 | 2.4 |
| 6 | 5.4 |
| 8 | 9.6 |
| 10 | 15.0 |
Just before the air reaches the wind turbine, it has a speed of 10.0 m/s.
When the air has gone through the turbine, it has slowed down to a speed of 6.0 m/s.
As the air moves through the turbine, some of its kinetic energy is transferred to the turbine to generate electricity.
Use the information in Figure 1 to determine the percentage of the kinetic energy transferred to the turbine from the air.