Question

Please give me the correct answer,and faster.​

Answer 1

Explanation:

length expand from L to L + ∆L,

thus,

coefficient of linear expansion ,a = ∆L/ ( L ∆T)

Y , young modulus = stress / strain

Y = (F / 2S) / ∆L/L

Y = F / ( 2S a ∆T)

F = 2Y S a ∆T