Two small circular holes are drilled in a brass sheet with centres 40.0 cm apart at 20°C. Take α brass = 1.9 × 1 0 − 5 ∘ C − 1 . By how many cm does the distance between the centres increase when the sheet is heated to 120°C?

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumnumerical

Two small circular holes are drilled in a brass sheet with centres 40.0 cm apart at 20°C. Take $α_{brass} = 1.9 \times 1 0^{- 5}^{\circ} C^{- 1}$ . By how many cm does the distance between the centres increase when the sheet is heated to 120°C?

Answer:

0.08

Solution:

Distances in the sheet scale like any linear dimension: $Δ d = d α Δ T = 40.0 \times 1.9 \times 1 0^{- 5} \times 100 = 0.076$ cm.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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