A concrete beam (linear expansion coefficient 9.8×10–6 K–1) is 12.2 m long at room temperature (293 K). In order to contract by 0.0010 m, its temperature should be decreased by:
A. 1.2×10–5 K.
B. 8.2×10–5 K.
C. 0.38 K.
D. 8.4 K.
Answer:D
A concrete beam (linear expansion coefficient 9.8×10–6 K–1) is 12.2 m long at room temperature (293 K). In order to contract by 0.0010 m, its temperature should be decreased by:
A. 1.2×10–5 K. B. 8.2×10–5 K. C. 0.38 K. D. 8.4 K.