The Exterior of a Supersonic Airplane Is Made of Aluminum

question 4

Multiple Choice

The exterior of a supersonic airplane is made of aluminum, which has a coefficient of linear expansion of 24 × 10^-6 K^-1. At 15°C, the plane measures 62.1 m in length. When the plane is in flight, friction with the air increases the temperature of the exterior skin to 200°C. What is the change in the length of the outer skin of the plane?

• A) 20 cm
• B) 24 cm
• C) 28 cm
• D) 32 cm
• E) 36 cm

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