A 70-m-diameter garden pond holds 64 times 103 kg of water, Ask an Expert

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A 7.0-m-diameter garden pond holds 6.4 × 103 kg of water. Solar energy is incident on the pond at an average rate of 400 W/m2. If the water absorbs all the solar energy and does not exchange energy with its surroundings, how many hours will it take to warm from 15°C to 25°C?

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