Question

The breaking stress for a material is 2×10^8 M/m^2 . What maximum length of the wire of this material can be taken so that the wire does not break by own weight? Density of material is 5×10^3 kg/m^3

Answer 1

Weight of wire = ¶gAL

Stress = weight/area=¶gAL/A

=¶gL =breaking stress

2×10^8 = L× 5×10^3 × 10

So, L = 4×10^3m or 4 km