Question:
The two wires shown in figure are made of the same material which has a breaking stress of $8 \times 10^{8} \mathrm{~N} / \mathrm{m}^{2}$. The area of cross-section of the upper wire is $0.006 \mathrm{~cm}^{2}$ and that of the lower wire is $0.003 \mathrm{~cm}^{2 \cdot}$ The mass $\mathrm{m}_{1}=10 \mathrm{~kg}, \mathrm{~m}_{2}=20 \mathrm{~kg}$ and the hanger is light.
(a) Find the maximum load that can be put on the hanger without breaking a wire. Which wire will break first if the load is increased?
(b) Repeat the above part if $m_{1}=10 \mathrm{~kg}, m_{2} 36 \mathrm{~kg}$
Solution:
