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Difficulty: Very hardModern Attractions and Engineering

Opened in 20002000 to celebrate the new millennium, the 135-metre135\text{-metre} tall London Eye is a masterpiece of 21st21^{\text{st}}-century engineering. Unlike a conventional Ferris wheel, it is technically described as a 'cantilevered' observation wheel. Which of the following technical descriptions accurately identifies the structural feature that justifies this classification?

  1. The entire structure is supported by an A-frame on only one side of the river, with the rim extending out over the water without a second support pier.Answer
  2. B
    It uses a 'geodesic' frame where the weight is distributed through a series of interlocking transparent biomes made of high-strength foil.
  3. C
    It is a 'tension-leg' structure that relies on the constant flow of the River Thames to maintain its vertical stability through underwater cables.
  4. D
    It is a 'suspended' system where the passenger capsules hang freely from the rim and use gravity to pivot as the wheel rotates.

Answer

The London Eye is classified as cantilevered because it is supported by an A-frame on only one side of the river.
The London Eye is structurally unique because it is 'cantilevered', meaning its entire weight is supported by an A-frame on one side only (the land side). Traditional Ferris wheels are supported on both sides of the axle. Additionally, the London Eye's capsules are mounted on the outside of the rim and are motorized, rather than hanging freely.

Step-by-Step Solution

1
Recall the technical classification of the London Eye provided in the official handbook and engineering summaries.
Identify that the London Eye is uniquely described as a 'cantilevered' observation wheel.
This technical term distinguishes it from traditional amusement park wheels.
2
Define the engineering term 'cantilevered' in the context of large-scale structures.
A cantilever is a structural element anchored at only one end to a vertical support from which it protrudes.
To understand why the London Eye's support system is unique.
3
Match the definition of 'cantilevered' to the physical design of the London Eye.
The London Eye is held by a 45-degree45\text{-degree} A-frame on the land side, while the wheel itself hangs over the River Thames without a support on the other side.
To confirm that the one-sided support is the defining feature of its classification.

Key Concept

Cantilevered Engineering in Modern Landmarks
Estimated Time:3m 0s
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Topics

Modern Attractions and Engineering

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