A free composite rod has 40 cm of brass ( α = 18 × 1 0 − 6 K − 1 ) joined end to end with 60 cm steel ( α = 12 × 1 0 − 6 K − 1 ). For a 150 K rise, find total extension in mm.

Δ L = ( 400 × 18 × 1 0 − 6 + 600 × 12 × 1 0 − 6 ) ( 150 ) mm . Δ L = ( 0.0072 + 0.0072 ) ( 150 ) = 2.16 mm .

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

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A free composite rod has 40 cm of brass $(α = 18 \times 1 0^{- 6} K^{- 1})$ joined end to end with 60 cm steel $(α =$ $12 \times 1 0^{- 6} K^{- 1}$ ). For a 150 K rise, find total extension in mm.

Answer:

2.16

Solution:

$Δ L = (400 \times 18 \times 1 0^{- 6} + 600 \times 12 \times 1 0^{- 6}) (150) mm$ .

$Δ L = (0.0072 + 0.0072) (150) = 2.16 mm .$

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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