Cold water from a tap is put into a kettle. The temperature of the water increases from 6 °C to its boiling point of 100 °C. Calculate the change in thermal energy when the mass of water heated is 1.5 kg Specific heat capacity = 4200 J/kg °C
Question
Cold water from a tap is put into a kettle. The temperature of the water increases from 6 °C to its boiling point of 100 °C. Calculate the change in thermal energy when the mass of water heated is 1.5 kg Specific heat capacity = 4200 J/kg °C
Solution
To calculate the change in thermal energy, we can use the formula:
Q = mcΔT
where: Q = thermal energy (in Joules) m = mass (in kg) c = specific heat capacity (in J/kg°C) ΔT = change in temperature (in °C)
Given: m = 1.5 kg c = 4200 J/kg°C ΔT = 100°C - 6°C = 94°C
Substituting these values into the formula, we get:
Q = 1.5 kg * 4200 J/kg°C * 94°C = 594,000 Joules
So, the change in thermal energy is 594,000 Joules.
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