Question

a rod of 80cm expands to 82 cm when temperature is increased by 15*C. find the coefficient of linear expansion.​

Answer 1

Answer:

here is ur answer ...here is an exl

Explanation:

Let the initial lengths of the rods(at 0∘C) be l1​ and l2​.

Since the difference in lengths at all temperatures is 30cm,

l2​−l1​=30

and l1​(1+α1​Δθ)−l2​(1+α2​Δθ)=30

⟹l1​α1​=l2​α2​

⟹11l1​=19l2​

and l1​−l2​=30cm

⟹l1​=71.25cm,l2​=41.25cm