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1. |
A 10 m aluminium flagpole is installed at 30°C. After 2 days, the temperature drops to -10° C. How much does the height change of the flagpole (in mm)? (Assume thermal expansion coefficient for aluminium = 23 × 10-6°C-1) |
A. | 7.8 mm |
B. | 8.8 mm |
C. | 9.5 mm |
D. | 9.2 mm |
Answer» E. | |