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
Answer: B
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