Question

answer the question correctly to continue: why might engineers avoid using nonmetals for structural parts of a roller coaster? they are too heavy they are always expensive they conduct electricity too easily they can be brittle or too flexible

Explanation:

Non - metals can be brittle (e.g., some ceramics which are non - metals can break easily under stress) or too flexible (like some polymers which may not hold a rigid shape required for structural integrity in a roller coaster). Metals, on the other hand, generally have better mechanical properties for structural use. Non - metals are not too heavy (many are lightweight), not always expensive (e.g., carbon which is a non - metal is relatively common in some forms), and most non - metals do not conduct electricity easily (which is a property not relevant to structural non - electrical parts of a roller coaster in terms of why they are avoided for structure).

Answer:

They can be brittle or too flexible