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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumsingle choice

A 20 cm rod A expands by 0.075 cm from 0°C to 100°C; a 20 cm rod B expands by 0.045 cm. A 20 cm composite rod expands by 0.060 cm over the same interval. Length of metal B is:

Options:

Answer:

Solution:

$α_{A} = \frac{0.075}{2000} = 3.75 \times 1 0^{- 5}$ .

$α_{B} = \frac{0.045}{2000} = 2.25 \times 1 0^{- 5} . 100 [α_{A} (20 - x) + α_{B} X] = 0.060. 0.075 - 0.0015 x = 0.060, so x = 10 cm .$

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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