Question

A substance breaks down by a stress of 10⁶ N/m². If the density of the material of the wire is 3×10³ kg/m³, then the length of the wire of the substance which will break under its own weight when suspended vertically, is

• A. 66.6 m
• B. 60.0 m
• C. 33.3 m
• D. 30.0 m

Answer 1

Answer: (C)

33.3 m

Answer 2

$L = \frac { p } { d g } = \frac { 10 ^ { 6 } } { 3 \times 10 ^ { 3 } \times 10 } = \frac { 100 } { 3 } = 33.3 \mathrm {~m}$