A steel bridge is 1000 m long at -20C in winter. What is the change in length when the temperature rises to 40C in summer? The average coefficient of linear expansion of this steel is 11 10-6 K-1.
A) 0.33 m
B) 0.44 m
C) 0.55 m
D) 0.66 m
Question 2
A 10-gram wire that is 6.0 m long is under tension. When a transverse wave of frequency 280 Hz travels along the wire, its wavelength is 0.60 m,and its amplitude is 8.4 mm.
How much time does it take for a crest of the transverse wave to travel the length of the wire? A) 36 ms
B) 31 ms
C) 40 ms
D) 44 ms
E) 49 ms
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