Question

A sheet of glass measures one metre by half metre at 0°C. Calculate its area at 30°C, a for


glass = 0.000009°C-1.
​

Answer 1

Answer:

0.50027$m^{2}$

Explanation:

ΔA=$2\alpha A_{0} T$

Where ΔA is the change in area

There is a 2 since the coefficient for area = 2 x that for the linear coefficient

$A_{0}$ is the original area

$\alpha$ is the coefficient of thermal expansion

And T is the change in temperature

ΔA=2(0.000009)(0.5)(30-0)=0.00027$m^{2}$

New area= ΔA+$A_{0}$ = 0.5+0.00027=0.50027$m^{2}$