A team of engineers hypothesizes that adding small dimples to the surface of a wind-turbine blade reduces drag and increases the energy the blade captures from the wind.
Which experimental result, if true, would most strongly support the team's hypothesis?
- A
Dimpled balls in some sports travel farther than smooth balls.
- B
Dimples are easier to clean than smooth surfaces.
- C
The cost of adding dimples to a blade is relatively low.
- Dcheck_circle
In a wind-tunnel test, dimpled blades produced 8 percent more energy than smooth blades under identical conditions.
Explanation
A is a direct test of the hypothesis under controlled conditions. C is a loose analogy. B and D do not test drag or energy capture.