The length of a side of a metallic cube at 20oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10-5k-1, find the volume of the cube at 120oC .
-
126.50cm3
- 126.25cm3
- 126.00cm3
- 125.00cm3
The correct answer is: A
Explanation
Recall that: Volume = L * L * L → 5 * 5 * 5 = 125
Y = \(\frac{V_2 - V_1}{V_1 \times \theta}\)
3 x 4 x 10-5 = \(\frac{V_2 - 125}{125 \times (120 - 20)}\)
V2 = 126.50cm3