Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionEasy2 minQB

PhysicsEasyinteger

A device melts 25 g ice at 0°C in 40 s. Find useful power in W. Use $L_{f} = 80 cal / g$ and 1 cal = 4.2 J.

Answer:

210

Solution:

$Q = m L_{f} = 25 (80) = 2000 cal = 8400 J$ .

$P = \frac{Q}{t} = \frac{8400}{40} = 210 W .$

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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