A blacksmith heated a metal whose cubic expansivity is 6.3 x 10-6K-1. The areal expansivity is

Assessment: JAMB UTME - Physics - 2007 Subject: Physics

Question 1 Report

2.0 x 10-6K-1

2.1 x 10-6K-1

4.2 x 10-6K-1

6.3 x 10-6K-1

Answer Details

If the lineal expansivity = ∝
=> area expansivity β= 2∝.
And cubic expansivity δ = 3∝.
=> 6.3 x 10-6 = 3∝
∴ ∝ =

∴ ∝ =	6.3 x 10-6	= 2.1x 10-6
	__3

∴ Area = 2∝ = 2 x 2.1x10-6
= 4.2 x 10-6K-1

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