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Q. A 5m-diameter garden pond holds 5.90 times 10^ {3};{rm kg} of water?

Solar energy is incident on the pond at an average rate of 400 {rm{ W/m}}^2. If the water absorbs all the solar energy and does not exchange energy with its surroundings, how many hours would it take to warm from 15^circ {rm{C}} to 25 ^circ {rm{C}}?

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