A copper rod, 5m long when heated through 2..

Question 1 Report

A copper rod, 5m long when heated through 20c, expands by 1mm. If a second copper rod, 2.5m long is heated through 5c, by how much will it expand?

4mm

2mm

0.25mm

0.12mm

Answer Details

l $_{1}$ = 5m, ΔT = 10c, l $_{2}$ - l $_{1}$ = 1mm
l $_{1}$ = 2.5m, ΔT = 5c, l $_{2}$ - l $_{1}$ = ?

using

_{2}

- l

_{1}

_{1}

ΔT

15(10)

_{2}

- l

_{1}

2.5(5)

_{2}

_{2}

2.5(5)5(10)

0.25mm