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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumsingle choice

An electric kettle contains 1.5 kg water at $10 0^{\circ} C$ and has a 2.0 kW element. If its thermostat fails, approximately how long until it boils dry? Use $L_{v} = 2000 kJ kg^{- 1}$ .

Options:

Answer:

Solution:

$Q = m L_{v} = 1.5 (2.0 \times 1 0^{6}) = 3.0 \times 1 0^{6} J$ .

$t = \frac{Q}{P} = 1500 s, neglecting losses.$

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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