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Q1.
An electric kettle was switched on.
The graph below shows how the temperature of the water inside the kettle changed
The energy transferred to the water in 100 seconds was 155 000 J.
specific heat capacity of water = 4200 J/kg °C
Determine the mass of water in the kettle.
Use the graph above.
Give your answer to 2 significant figures.
________________________________________________________________________________________________________ ____________________________________________________
Mass of water (2 significant figures) = _______________ kg
(5)
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155000 = 𝑚 × 4200 × 78
𝑚 = 155000 / 4200 × 78
m=0.4731 kg
m=0.47 kg

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