The volume of a 1 cm\(^3\) metal ball increases by 0.0018 cm\(^3\) when heated through temperature θ. If the linear expansivity of the ball is 2.0 x 10\(^{-5} K^{-1}\), find θ.
Answer: C. 30°C
(Volume exp. γ = 3 α = 6×10\(^{-5}\)K\(^{-1}\);
ΔV = V γ θ;
θ = \(\frac{0.0018}{1 \times 6\times 10^{-5}}\) = 30°C.
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