A brass disc is 5.010 cm in diameter at 30°C. It is cooled to -70°C. With α = 2.0 × 1 0 − 5 K − 1 and first-order expansion, find its diameter in cm to four decimals.

d ′ = 5.010 [ 1 + ( 2 × 1 0 − 5 ) ( − 100 ) ] . d ′ = 4.99998 cm . To four decimals, 5.0000 cm.

Start Free Mock LoginAlready registered? Login here

Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumnumerical

A brass disc is 5.010 cm in diameter at 30°C. It is cooled to -70°C. With $α = 2.0 \times 1 0^{- 5} K^{- 1}$ and first-order expansion, find its diameter in cm to four decimals.

Answer:

5.00

Solution:

$d^{'} = 5.010 [1 + (2 \times 1 0^{- 5}) (- 100)]$ .

$d^{'} = 4.99998 cm .$

To four decimals, 5.0000 cm.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...