Exam-style question
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How much energy is required to raise the temperature of 5 kg of water by 20 °C if the specific heat capacity of water is 4200 J/kg°C?.
- A.42000 J
- B.21000 J
- C.84000 J
- D.105000 J
Model answer
What a good answer should say
- 42000 J
Explanation
Why this works
Using the formula E = m x c x Δθ, we substitute m = 5 kg, c = 4200 J/kg°C, and Δθ = 20 °C: E = 5 x 4200 x 20 = 42000 J. Therefore, the energy required is 42000 J.
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