Concept explainers
A steel wire has the following properties:
Length = 5.00 m
Cross-sectional area = 0.040 cm2
Young’s modulus = 2.0 × 1011 Pa
Shear modulus = 0.84 × 1011 Pa
Proportional limit = 3.60 × 108 Pa
Breaking stress = 11.0 × 108 Pa
The proportional limit is the maximum stress for which the wire still obeys Hooke’s law (see point B in Figure 11.12). The wire is fastened at its upper end and hangs vertically. (a)How great a weight can be hung from the wire without exceeding the proportional limit? (b) How much does the wire stretch under this load? (c) What is the maximum weight that can be supported?
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