Question detail
If 3 kg of water is heated from 20 °C to 80 °C, calculate the change in thermal energy. The specific heat capacity of water is 4200 J/kg°C.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
- A. 75600 J
- B. 84000 J
- C. 126000 J
- D. 63000 J
Answer
75600 J
Explanation
The correct option is "75600 J". 75600 J is right because it directly matches Energy stores and systems: Calculate changes in energy when a system is changed by heating.. The other options are less suitable because they change the required Physics relationship, confuse the relevant energy store or use a distractor that does not answer the question.
Common mistake
Common Mistake in Energy Calculation
Students often forget to convert units when calculating changes in energy, leading to incorrect answers.
Always check that mass is in kilograms and energy is in joules before performing calculations.
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