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How long does it take a 750W heater to raise the temperature of 1kg of water from 20oC ...

How long does it take a 750W heater to raise the temperature of 1kg of water from 20oC to 50oC [specific heat capacity of water = 4200Jkg-1K-1]

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




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