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 .
-
A.
126.50cm3 -
B.
126.25cm3 -
C.
126.00cm3 -
D.
125.00cm3
Correct Answer: Option A
Explanation
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