6. Find the time taken by a 500 W heater to raise the
temperature of 50 kg of material of specific heat
capacity 960 J kg-1 K-1 from 18°C to 38°C. Assume
that all the heat energy supplied by heater is given
to the material.
Ans. 32 min.
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Answer: 1920 sec or 32 min
Explanation: Energy = Power × time
Energy = mCΔФ
Power × time = mCΔФ
500 × t = 50 × 960 × (38-18)
500t = 960000
t = 1920 sec
1920 ÷ 60 = 32 min
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