(Solved): please solve all parts correctly. Q.3 (a) Two copper rods and one steel rod each of 2.5cm dia ...

please solve all parts correctly.

Q.3 (a) Two copper rods and one steel rod each of $2.5\mathrm{cm}$ diameter together support a load of $4000\mathrm{kg}$. Find the stresses on each rod. Take E, Young's modulus of steel and copper as $2\times 10^6$ $\mathrm{kg}/{\mathrm{cm}}^2$ and $1.1\times 10^6\mathrm{kg}/{\mathrm{cm}}^2$ respectively. 6 (b) The following data relate to a bar subjected to a tensile test : Diameter of bar $=25\mathrm{mm}$, Tensile load $=50\mathrm{kN}$, Gauge length $=$ $250\mathrm{mm}$, Extension of the bar $=0.121\mathrm{mm}$ and Change in diameter $=$ $0.00357\mathrm{mm}$ Calculate the Poisson's ratio and the values of three moduli.