Question

3. A metre scale is made of iron and is calibrated at
15°C. Calculate the length of rod at 40°C. The co-
efficient of linear expansion of iron is 1.2 x 10-5 °C-1.​

Answer 1

Explanation:

• Li = 1 m
• a = 1.2 x 10-5 C⁰-1
• T = 40-15 = 25 C⁰

Lf = Li (1 + a T)

1 ( 1 + 1.2 × 10-5 × 25)

Lf = 1.0003 m