3 Which of the following substances is ductile?
a. glass
b. high carbon steel
c. copper
d. brass
4 A solid cylindrical steel column is 4.0 m long and 9.0 cm in diameter. What will be its decrease in length when carrying a load of 80 000 kg? Y=1.9×1011PA
a. 5.2 mm
b. 1.4 mm
c. 3.7 mm
d. 2.6 mm
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