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Author Question: A steel bridge is 1000 m long at -20C in winter. What is the change in length when the temperature ... (Read 99 times)

saraeharris

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on: Jul 29, 2018
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


stallen

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Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

A


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