Passage The first Tacoma Narrows Bridge, inTacoma, Washington, opened to traffic on July 11940. The bridge, which was intended to withstand high winds, collapsed four months later on November 7,1940, due to a physical phenomenon known as aeroelastic flutter. Flutter is a self feeding vibration that occurs when aerodynamic forces on an object couple with a structure's natural mode of vibration, producing rapid periodic motion. Thanks to the Tacoma collapse, engineers will never again overlook the problem of flutter: it has influenced the design of every great long-span bridge built since 1940. Question The passage implies that the true cause of the bridge collapse was

Question

Passage The first Tacoma Narrows Bridge, inTacoma, Washington, opened to traffic on July 11940. The bridge, which was intended to withstand high winds, collapsed four months later on November 7,1940, due to a physical phenomenon known as aeroelastic flutter. Flutter is a self feeding vibration that occurs when aerodynamic forces on an object couple with a structure's natural mode of vibration, producing rapid periodic motion. Thanks to the Tacoma collapse, engineers will never again overlook the problem of flutter: it has influenced the design of every great long-span bridge built since 1940. Question The passage implies that the true cause of the bridge collapse was

Answer 1

## Brief ExplanationThe passage suggests that the true cause of the Tacoma Narrows Bridge collapse was a physical phenomenon known as aeroelastic flutter. This phenomenon is a self-feeding vibration that occurs when aerodynamic forces on an object couple with a structure's natural mode of vibration, producing rapid periodic motion.# AnswerThe true cause of the bridge collapse was aeroelastic flutter.