Answer:
the change in length of the copper bar is 1.26 x 10^-3 meters (or 1.26 millimeters).
Step-by-step explanation:
The change in length of a copper bar can be calculated using the formula:
ΔL = L₀αΔT
where:
ΔL = change in length
L₀ = original length of the copper bar (1.5 m)
α = coefficient of linear expansion for copper (16.8 x 10^-6 K^-1)
ΔT = change in temperature (353 K - 303 K = 50 K)
Plugging in the values, we get:
ΔL = (1.5 m)(16.8 x 10^-6 K^-1)(50 K)
ΔL = 1.26 x 10^-3 m