Exam-style question
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If a substance has a specific heat capacity of 2000 J/kg°C and a mass of 4 kg, how much energy is needed to increase its temperature by 10 °C?.
- A.80000 J
- B.60000 J
- C.40000 J
- D.20000 J
Model answer
What a good answer should say
- 80000 J
Explanation
Why this works
Using the formula E = m x c x Δθ, we substitute m = 4 kg, c = 2000 J/kg°C, and Δθ = 10 °C: E = 4 x 2000 x 10 = 80000 J. Thus, the energy needed is 80000 J.
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