140907 An iron rod of length $2 \mathrm{~m}$ and cross- sectional area of $50 \mathrm{~mm}^{2}$ stretched by $0.5 \mathrm{~mm}$, when a mass of $250 \mathrm{~kg}$ is hung from its lower end. Young's modulus of iron rod is

140908 A copper wire of length $2.2 \mathrm{~m}$ and a steel wire of length $1.6 \mathrm{~m}$, both of diameter $3.0 \mathrm{~mm}$ are connected end to end. When stretched by a force, the elongation in length $0.50 \mathrm{~mm}$ is produced in the copper wire. The stretching force is
$\left(Y_{\text {cu }}=1.1 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}, Y_{\text {steel }}=2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}\right)$

140909 Two rods copper and brass having initial lengths $l_{1}$ and $l_{2}$ respectively are connected together to form a single rod of length $l_{1}+l_{2}$. The coefficients of linear expansion of copper and brass are $\alpha_{c}$ and $\alpha_{b}$ respectively. If the length of each rod increases by same amount when their temperatures are raised by $\mathrm{t}^{\circ} \mathrm{C}$, then what is $\frac{l_{1}}{l_{1}+l_{2}}$ equal to?

140913 A force (F) applied on a wire increases its length by $2 \times 10^{-3} \mathrm{~m}$, to increase the wire's length by $4 \times 10^{-3} \mathrm{~m}$, the applied force will be

140907 An iron rod of length $2 \mathrm{~m}$ and cross- sectional area of $50 \mathrm{~mm}^{2}$ stretched by $0.5 \mathrm{~mm}$, when a mass of $250 \mathrm{~kg}$ is hung from its lower end. Young's modulus of iron rod is

140908 A copper wire of length $2.2 \mathrm{~m}$ and a steel wire of length $1.6 \mathrm{~m}$, both of diameter $3.0 \mathrm{~mm}$ are connected end to end. When stretched by a force, the elongation in length $0.50 \mathrm{~mm}$ is produced in the copper wire. The stretching force is
$\left(Y_{\text {cu }}=1.1 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}, Y_{\text {steel }}=2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}\right)$

140909 Two rods copper and brass having initial lengths $l_{1}$ and $l_{2}$ respectively are connected together to form a single rod of length $l_{1}+l_{2}$. The coefficients of linear expansion of copper and brass are $\alpha_{c}$ and $\alpha_{b}$ respectively. If the length of each rod increases by same amount when their temperatures are raised by $\mathrm{t}^{\circ} \mathrm{C}$, then what is $\frac{l_{1}}{l_{1}+l_{2}}$ equal to?

140913 A force (F) applied on a wire increases its length by $2 \times 10^{-3} \mathrm{~m}$, to increase the wire's length by $4 \times 10^{-3} \mathrm{~m}$, the applied force will be

140907 An iron rod of length $2 \mathrm{~m}$ and cross- sectional area of $50 \mathrm{~mm}^{2}$ stretched by $0.5 \mathrm{~mm}$, when a mass of $250 \mathrm{~kg}$ is hung from its lower end. Young's modulus of iron rod is

140908 A copper wire of length $2.2 \mathrm{~m}$ and a steel wire of length $1.6 \mathrm{~m}$, both of diameter $3.0 \mathrm{~mm}$ are connected end to end. When stretched by a force, the elongation in length $0.50 \mathrm{~mm}$ is produced in the copper wire. The stretching force is
$\left(Y_{\text {cu }}=1.1 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}, Y_{\text {steel }}=2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}\right)$

140909 Two rods copper and brass having initial lengths $l_{1}$ and $l_{2}$ respectively are connected together to form a single rod of length $l_{1}+l_{2}$. The coefficients of linear expansion of copper and brass are $\alpha_{c}$ and $\alpha_{b}$ respectively. If the length of each rod increases by same amount when their temperatures are raised by $\mathrm{t}^{\circ} \mathrm{C}$, then what is $\frac{l_{1}}{l_{1}+l_{2}}$ equal to?

140913 A force (F) applied on a wire increases its length by $2 \times 10^{-3} \mathrm{~m}$, to increase the wire's length by $4 \times 10^{-3} \mathrm{~m}$, the applied force will be

140907 An iron rod of length $2 \mathrm{~m}$ and cross- sectional area of $50 \mathrm{~mm}^{2}$ stretched by $0.5 \mathrm{~mm}$, when a mass of $250 \mathrm{~kg}$ is hung from its lower end. Young's modulus of iron rod is

140908 A copper wire of length $2.2 \mathrm{~m}$ and a steel wire of length $1.6 \mathrm{~m}$, both of diameter $3.0 \mathrm{~mm}$ are connected end to end. When stretched by a force, the elongation in length $0.50 \mathrm{~mm}$ is produced in the copper wire. The stretching force is
$\left(Y_{\text {cu }}=1.1 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}, Y_{\text {steel }}=2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}\right)$

140909 Two rods copper and brass having initial lengths $l_{1}$ and $l_{2}$ respectively are connected together to form a single rod of length $l_{1}+l_{2}$. The coefficients of linear expansion of copper and brass are $\alpha_{c}$ and $\alpha_{b}$ respectively. If the length of each rod increases by same amount when their temperatures are raised by $\mathrm{t}^{\circ} \mathrm{C}$, then what is $\frac{l_{1}}{l_{1}+l_{2}}$ equal to?

140913 A force (F) applied on a wire increases its length by $2 \times 10^{-3} \mathrm{~m}$, to increase the wire's length by $4 \times 10^{-3} \mathrm{~m}$, the applied force will be