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To help keep his warm on cold days, a fa...

To help keep his warm on cold days, a farmer stores 840 kg of solar-heated water `( L_(F) = 3.35 xx 10^(5) J //kg )` in barrels . For how many hours would a 2.0 kW electric space heater have to operate to provide the same amount of heat as the water does when it cools from 10.0 to `0.0^(@)C` and completely freezes ?

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