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How long does it take a 750 W heater operating at full rating to raise the temperature ...

How long does it take a 750 W heater operating at full rating to raise the temperature of 1 kg of water from 40oC to 70oC? (Take the specific heat capacity of water as 4200 J kg-1 K-1 and neglect heat losses).

A. 84s
B. 112s
C. 168s
D. 280s
E. 616s




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