Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoCalorimetryMedium2 minQB

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Passage / Comprehension

As an experimenting physicist, you have taken $1 kg$ of a solid at a temperature of $- 5^{\circ} C$ and heat it at a constant rate of $10 kJ/min$ . You record the temperature at different times and plot it in the graph. The graph is shown here. Neglect heat losses.

After having supplied an energy of $15000 J$ , you would find that the sample

Options:

Answer:

Solution:

Heat is supplied at $10 kJ/min$ , so $15000 J$ is supplied in $1.5 min$
$t = \frac{15 kJ}{10 kJ/min} = 1.5 min$
From the graph, the flat (melting) part lies between $1 min$ and $2.5 min$
So at $1.5 min$ the sample is partly solid and partly liquid.

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Calorimetry

⏱ 2mℹ️ Source: QB

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