PhysicsQuantity of heatWAEC
How much heat is needed to raise 2 kg of water from 20 °C to 70 °C? [specific heat capacity of water = 4200 J/kg K]
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Answer: B. 420 000 J
Q = mcΔθ = 2 × 4200 × 50 = 420 000 J.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.