The heating coil of a hot water heater has a resistance of 17 ? and operates at 300 V. How long a time is required to raise the temperature of 115 kg of water from 18°C to 75°C? (The specific heat for water = 103 cal/kg?°C and 1.0 cal = 4.186 J)
a. 1.5 h
b. 1.9 h
c. 0.45 h
d. 1.4 h
e. 0.50 h
d
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