Post-UTME Physics 2016 Objective — Question 6
Question 6 of 20 from the Post-UTME Screening (Post-UTME) Physics 2016 Objective paper, with the correct answer and a full explanation.
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How long will it take a 1000W heater to raise the temperature of 0.5kg of water from 15C to 95C? [Specific heat capacity of water = 4200Jkg-1K-1]
- A. 168.0sCorrect
- B. 321.0s
- C. 31.5s
- D. 149.5s
Explanation
Heat needed = mcdeltaT = 0.5 x 4200 x 80 = 168000J. Time = Q/P = 168000/1000 = 168.0s.
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