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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoCalorimetryMedium2 minQB

PhysicsMediumsingle choice

Passage / Comprehension

Given a liquid initially at -20°C, warmed in a 2520 W microwave oven. Its mass is 1 kg and specific heat s = 2(T - 253) cal/(g K), where T is in kelvin. Take T = θ + 273, where θ is in °C.

The time after which temperature of liquid becomes 20°C (in sec)

Options:

Answer:

Solution:

$θ = 2 0^{\circ} C$ $5 θ^{2} + 200 θ + 2000 = 3 t 5 \times 400 + 4000 + 2000 = 3 t t = \frac{8000}{3} t = 2666.67 sec$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Calorimetry

⏱ 2mℹ️ Source: QB

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