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[" 64.An electric kettle (rated accurate...

[" 64.An electric kettle (rated accurately at "2.5kW)" is used to heat "],[3kg" of water from "15^(@)C" to boiling point.It takes "9.5" minutes."],[" Then the amount of heat has been lost is : "],[[" (1) "3.5times10^(5)J," (2) "7times10^(6)J],[" (3) "3.5times10^(4)J," (4) "7times10^(8)J]]

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