Question detail
A 10 kg object is cooled, resulting in a temperature decrease of 15 °C. If the specific heat capacity is 2000 J/kg°C, what is the change in thermal energy?
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. -30000 J
- B. -15000 J
- C. -20000 J
- D. -25000 J
Answer
-30000 J
Explanation
The correct option is "-30000 J". -30000 J is right because it directly matches Energy changes in systems: Rearrange the specific heat capacity equation to calculate mass, specific heat capacity or temperature change.. 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 Rearranging Equations
Students often confuse the variables when rearranging the specific heat capacity equation, leading to incorrect calculations for mass, specific heat capacity, or temperature change.
To fix this, carefully identify each variable in the equation (change in thermal energy = mass x specific heat capacity x temperature change) and ensure you isolate the variable you need to calculate correctly.
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