Home » » A thin aluminum plate has a surface area of 1500m at 20oC. What will be its surf...

A thin aluminum plate has a surface area of 1500m at 20oC. What will be its surf...

Question

A thin aluminum plate has a surface area of 1500m at 20oC. What will be its surface area when it is cooled to -20oC? (Take the linear expansivity of aluminum to be 2.5 x 10-5k-1).

A) 1.503m2

B) 1.500m2

C) 1.498m2

D) 1.497m2

E) 1.490m2

Explanation:

$$\beta$$ = A2 - A1

2 X 10-5 x 2.5 = $$\frac{A_2 \times 1.5}{1.5 \times (-20 -20)}$$

A2 = 1.498m2

Dicussion (1)

• $$\beta$$ = A2 - A1

2 X 10-5 x 2.5 = $$\frac{A_2 \times 1.5}{1.5 \times (-20 -20)}$$

A2 = 1.498m2