The exterior of a supersonic airplane is made of aluminum, which ...

[ereecah]

The exterior of a supersonic airplane is made of aluminum, which has a coefficient of linear expansion of 24  10-6 K-1. At 15C, 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 200C. What is the change in the length of the outer skin of the plane?
  A) 32 cm B) 20 cm C) 36 cm D) 24 cm E) 28 cm

Question 2

The smallest kinetic energy that an electron in a box (an infinite well) can have is zero.
 
  A) True
  B) False

[robbielu01]

Answer to Question 1

E

Answer to Question 2

B

[ereecah]

Thank you!

[robbielu01]

Always glad to help...