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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumnumerical

A blackened solid copper sphere of radius 3 cm is in an evacuated enclosure with walls at 27°C. At what rate must energy be supplied to keep the sphere at 227°C, in W? ( $σ = 5.67 \times 1 0^{- 8}$ W m⁻² K⁻⁴)

Answer:

34.90

Solution:

$P = σ \cdot 4 π r^{2} (T^{4} - T_{0}^{4}) = 5.67 \times 1 0^{- 8} \times 4 π 0.03^{2} (50 0^{4} - 30 0^{4}) = 34.9$ W.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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