An 8000-Kg Aluminum Flagpole 100-M High Is Heated by the Sun

An 8000-kg aluminum flagpole 100-m high is heated by the Sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10⁻⁶ (°C) −1, the density is 2.7 × 10³ kg/m³, and the specific heat of aluminum is 0.215 cal/g⋅°C.)

A) 7.2 × 10⁵
B) 7.2 × 10⁷
C) 7.2 × 10³
D) 7.2 × 10¹
E) 7.2 × 10²