PhysicsQuantity of heatJAMB
How long does a 2 kW kettle take to heat 1.5 kg of water from 25 °C to 100 °C if no heat is lost? [c = 4200 J/kg K]
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Answer: B. 236 s
Q = 1.5 × 4200 × 75 = 472,500 J; t = 472,500/2000 ≈ 236 s.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.