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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferEasy2 min

PhysicsEasynumerical

An aluminium base 2 cm thick and of area 0.5 m² is heated to 250°C on one side, with boiling water at 100°C on the other. $k_{A l} = 205$ W m⁻¹ K⁻¹ and $L_{v a p} = 2256 \times 1 0^{3}$ J/kg. How much water evaporates per minute, in kg?

Answer:

20.45

Solution:

$P = \frac{205 \times 0.5 \times 150}{0.02} = 7.688 \times 1 0^{5}$ W. Heat in 60 s = $4.612 \times 1 0^{7}$ J, so $m = \frac{4.612 \times 1 0 ^{7}}{2256 \times 1 0 ^{3}} = 20.45$ kg.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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