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International A LevelPhysicsEdexcelExam Questions5. Thermodynamics, Radiation, Oscillations & CosmologyThermal Energy Transfer

Thermal Energy Transfer (Edexcel International A Level Physics)

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Thermal Energy Transfer

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Thermal Energy Transfer

1
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Cocoa powder, milk and hot water are mixed together to produce a ‘hot chocolate’ drink. The mass of the drink is 275 g, and its initial temperature is 71.5 °C.

Ice at 0.0 °C is added to the drink to reduce its temperature. Research indicates that the maximum serving temperature of any hot drink should be 58.0 °C.

Deduce whether 4.0 g of ice would be enough to bring the temperature below 58.0 °C.

specific latent heat of ice = 3.34 × 105 J kg–1

specific heat capacity of ‘hot chocolate’ = 3750 J kg–1 °C–1 \

specific heat capacity of water = 4190 J kg–1 °C–1

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2
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A kettle was used to heat 855 g of water to boiling point. The initial temperature of the water was 21.5 °C and it took 115 s to heat the water to 100 °C.

The kettle is left switched on for 175 s after the water has reached 100 °C.

Calculate the mass of water that was boiled away.

specific heat capacity of water = 4190 J kg−1 K−1

specific latent heat of vaporisation of water = 2.26 × 106 J kg−1

Mass of water that was boiled away = .........................................

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3
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In the book Charlie and the Chocolate Factory, a palace is made entirely from chocolate.

Soon after it was made the palace melted, due to energy transfer from the Sun.

q13-wph15-05-june-2021-edexcel-int-as-and-a-level-phy

The total volume of chocolate used for the palace was 1250 m3. The initial temperature of the chocolate palace was 28.5°C. Chocolate melts at a temperature of 36.0°C.

The book states that the palace melted completely in less than a day.

Deduce whether this statement could be correct.

rate of energy transfer to the palace = 7.5 × 105 W

density of chocolate = 1325 kg m−3

specific latent heat of chocolate = 4.5 × 104 J kg−1

specific heat capacity of chocolate is 1.30 × 103 J kg−1 K−1

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