WAEC Physics 2024 Objective — Question 42
Question 42 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.
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42. A non-conducting vessel contains a liquid of mass 70.0 g at 25 deg C. Another 70.0 g of the same liquid is quickly poured into the vessel at 35 deg C. Determine the final temperature of the mixture.
- A. 15 deg C
- B. 20 deg C
- C. 30 deg CCorrect
- D. 40 deg C
Explanation
mc(delta theta c)=mc(delta theta h). 70xcx(f-25)=70xcx(35-f). f-25=35-f. 2f=60. f=30 deg C.
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