11.9 A brass wire 1.8 m long at 27°C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of –39 °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 × 10–5 K–1; Young’s modulus of brass = 0.91 × 1011 Pa.
11.9 A brass wire 1.8 m long at 27°C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of –39 °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 × 10–5 K–1; Young’s modulus of brass = 0.91 × 1011 Pa.
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1 Answer
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11.9 Initial temperature, = 27°C, Length of the wire at = 1.8 m
Final temperature, = -39°C
Diameter of the wire, d = 2.0 mm = 2 m
Coefficient of linear expansion of brass, /K
Youngs’ modulus of brass, Y = 0.91 Pa
Let the tension developed be F
We know Youngs’ modulus = =
Y = or F =
Here, A = cross-sectional area of the wire = = = 3.1416
Now can be written as = = ( = -1.32 L
Substituting all values, we get
F = (3.1416 &n
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