problem20_25

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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20.25: a) Heat flows out of the C 0 . 80 ° water into the ocean water and the C 0 . 80 ° water cools to C 0 . 20 ° (the ocean warms, very, very slightly). Heat flow for an isolated system is always in this direction, from warmer objects into cooler objects, so this process is irreversible. b) kg 100 . 0 of water goes form = = ° ° T mc Q is flow heat the and C 20.0 to C 0 . 80 J 10 2.154 ) 60.0C K)( kg J kg)(4190 (0.100 4 × - = ° - This Q comes out of the 0.100 kg of water and goes into the ocean.
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Unformatted text preview: For the 0.100 kg of water, K J 78.02 353.15) 293.15 ln( K) kg J kg)(4190 100 . ( ) ln( 1 2-= ⋅ = = ∆ T T mc S For the ocean the heat flow is J 10 154 . 2 4 × + = Q and occurs at constant T : K J 76 . 85 K 293.15 J 10 154 . 2 4 + = × = = ∆ T Q S K J 7 . 7 K J 85.76 K J 02 . 78 ocean water net + = +-= ∆ + ∆ = ∆ S S S...
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