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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediuminteger

A thin rectangular brass sheet of sides 15.0 cm and 12.0 cm is heated in a furnace to 600°C. How much electric power is needed to maintain the sheet at this temperature? Emissivity of brass surface at this temperature is 0.25 and Stefan constant = $5.67 \times 1 0^{- 8}$ W m⁻² K⁻⁴.

Answer:

297

Solution:

Both faces radiate: $A = 2 \times 0.15 \times 0.12 = 0.036$ m². $P = e σ A T^{4} = 0.25 \times 5.67 \times 1 0^{- 8} \times 0.036 \times 87 3^{4} = 297$ W (surroundings neglected).

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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