Tolong kak sama jalannya​

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Tolong kak sama jalannya​

Tolong kak sama jalannya​

Jawaban:

1. Lo= 2 m

a = 0,00001

∆t= 280-30= 250°C

∆L = Lo x a x ∆t

= 2 x 0,00001 x 250

= 0,005

Lt= Lo + ∆L

= 2 + 0,005

= 2,005 m

2. Ao = 5 x 5 = 25 cm²

∆t = 210-10= 200°C

b = 2a = 2 x 0,000025= 0,00005/°C

∆A = Ao x b x ∆t

= 25 x 0,00005 x 200

= 0,25 cm²

At = Ao + ∆t

= 25 + 0,25

= 25,25 cm²