Question detail
Calculate the change in thermal energy when 2 kg of water is heated from 20 °C to 100 °C. The specific heat capacity of water is 4,200 J/kg°C.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
Calculate the change in thermal energy when 2 kg of water is heated from 20 °C to 100 °C. The specific heat capacity of water is 4,200 J/kg°C.
Answer
672,000 J
Explanation
This question tests the ability to apply the specific heat capacity formula to calculate thermal energy change. The calculation involves determining the energy required to raise the temperature of a given mass of water. This answer is linked to Energy changes in systems because it applies the learning objective: Calculate the change in thermal energy when the temperature of a system changes.. It shows the Physics relationship clearly and keeps energy, power, work done and efficiency terms distinct where they appear.
Common mistake
Common Mistake in Thermal Energy Calculation
Students often forget to convert temperature changes into the correct units, leading to incorrect calculations of thermal energy.
Always ensure that temperature changes are in degrees Celsius when using the specific heat capacity equation.
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