10.9 A brass wire 1.8 m long at is held taut with little tension between two rigid…

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

10.9 A brass wire 1.8 m long at

27^{\circ} \mathrm{C}

is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of

-39^{\circ} \mathrm{C}

, what is the tension developed in the wire, if its diameter is 2.0 mm ? Co-efficient of linear expansion of brass

=2.0 \times 10^{-5} \mathrm{~K}^{-1}

; Young's modulus of brass

=0.91 \times 10^{11} \mathrm{~Pa}