Respuesta :
The Coefficient of linear expansion of the brass = 1.56 * 10 ⁻⁶
Thermal expansion is the tendency to be counted to trade its form, vicinity, volume, and density in reaction to an exchange in temperature, typically not including phase transitions. Temperature is a monotonic function of the average molecular kinetic electricity of a substance.
Length of metal sheet = 40 cm
broad = 8 cm
Initial Surface area = 40 × 8 = 320 cm²
Final surface area = 320.1 cm²
Change in area ΔA = 320.1 cm² - 320 cm² = 0.1 cm².
change in temperature ΔT = T final -T initial
ΔT = 100 - 0 = 100
α = coefficient of linear expansion
β = coefficient of Surfacial expansion
ΔA = A initial β ΔT
β = ΔA/A initial ΔT
β = 0.1 / 320 *100
β = 3.125 * 10 ⁻⁶
Relation between α and β :
α = β/2
α = 3.125 * 10 ⁻⁶/2
α = 1.56 * 10 ⁻⁶ answer.
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