what will be the sress at -20^° c, if a steel rod is streched between two fixed points? the tensile load at 20^° c is 5000N (cross sectional area of rod is 150mm^2)

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Q. What will be the stress at

- 20^{\circ} C,

if a steel rod with a cross-sectional area of

150 {m m}^{2}

is stretched between two fixed point ? The tensile load at

20^{\circ} C

5000

N :

(Assume

α = 11.7 \times 10^{- 6} /^{\circ} C

and

Y = 200 \times 10^{11} N / m^{2})

Q. What will be the stress at

- 20^{o} C

, if a steel rod with a cross-sectional area of

150 m m^{2}

is stretched between two fixed point ? The tensile load at

- 20^{o} C

5000 N

: (Assume

α = 11.7 \times 10^{- 6} /^{o} C

and

Y = 2000 \times 10^{11} N / m^{2}

)

A steel rod is rigidly clamped at its two ends. The rod is under zero tension at $20^{\circ} C$ . If the temperature rises to $100^{\circ} C$ , what force will the rod exert on one of the clamps? Area of cross section of the rod = $2.0 m m^{2}$ . Coefficient of linear expansion of steel $= 12.0 \times 10^{- 6}^{\circ} C^{- 1}$ and Young's modulus of steel = $2.00 \times 10^{11} N m^{- 2}$ .

Q. A steel rod is rigidly clamped at its two ends. The rod is under zero tension at 20°C. If the temperature rises to 100°C, what force will the rod exert on one of the clamps? Area of cross-section of the rod is 2.00 mm². Coefficient of linear expansion of steel is 12.0 × 10^–6 °C^–1 and Young's modulus of steel is 2.00 × 10¹¹ Nm^–2.

Q. Two steel rods and a copper rod of equal length

l_{0}

and equal cross-sectional area are joined rigidly as shown in figure. All the rods are in a state of zero tension at

0^{\circ} C

. The temperature of the system is increased to

30^{\circ} C

. Then:
[coefficient of linear expansion of copper is more than that of steel]

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