Advertisements
Advertisements
प्रश्न
A bridge is made from 20 m long iron rods. At temperature 18∘C, the distance between two rods in 0.4 cm. Up to what temperature will the bridge be in good shape?
Advertisements
उत्तर
Length of the iron rod = 20 m = 2000 cm at 18∘C
Distance between the length of two rods, = 0.4 cm
Temperature coefficient of linear expansion of iron = 11.5 × 10-6 °C-1
The bridge will be in good shape till both the rods expand by 0.2 cm as the temperature is increased. Let at temperature T, both the rods expand by 0.2 cm i.e. the total expansion is 0.4 cm.
Using formula for linear expansion of solids, we have
`(triangle l )/l = alpha_l triangle T`
`=> 0.4/2000 = 11.5 xx 10^(-6) xx ("T" - 18)`
`"T" =18 + 0.4/(2000 xx 11.5 xx 10^(-6)) = 35.4° "C"`
संबंधित प्रश्न
Explain the following
Water pipes in colder countries often burst in winter.
Define calorie. How many joules make one calorie?
Name the scientist who designed the first thermometer.
Explain the following:
Water is heated generally from below.
Draw a neat and labeled diagram of a clinical thermometer
Give a scientific reason for the following:
It is better to use thin blankets to keep the body warm rather than using a single blanket of thickness equal to their combined thickness.
