Question

review the abstract and then answer the question.
gravity and drag both reduce the maximum altitude that a rocket can reach, increasing the cost of rocket flights. this study hypothesizes that rockets with a smoother surface will experience less drag and reach higher altitudes, given the same thrust as rockets with rough surfaces. to test this hypothesis, three identical model rockets were constructed and given finishes with varying degrees of surface smoothness: roughed with 40 - grit sandpaper, unfinished, and glossed. each rocket was outfitted with b5 - 4 motors and flown ten times. flight results support the initial hypothesis, with the roughened - surface rocket reaching the apogee point at the lowest altitude and the glossed - surface rocket reaching it at the highest. in conclusion, the findings suggest that smoother surface finishes can reduce the drag force enough to affect altitude, thereby potentially increasing rocket efficiency and reducing fuel costs.
which best indicates that the primary audience is academics in the field of engineering?
the writer uses words like hypothesis, results, and conclusion.
the writer mentions that the surfaces had varying degrees of smoothness.
the writer uses specialized language such as drag, thrust, and apogee point.
the writer doesnt use any words that would be unfamiliar to high school students.

Explanation:

Academic experts in engineering would be familiar with specialized terms like "drag", "thrust", and "apogee point". These terms are technical and specific to engineering and physics - related fields. Using such specialized language indicates that the writer expects the audience to have prior knowledge of these concepts, which is more likely to be the case for academics in engineering.

Answer:

The writer uses specialized language such as drag, thrust, and apogee point.