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.


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