problem07_80

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

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7.80: (a) gh A gh V mgh ) m 1 ( ) ( energy Stored ρ ρ = = = . J 10 4 . 4 ) m 150 )( 8 . 9 )( m 1 )( m 10 0 . 3 )( m kg 1000 ( 12 s m 2 6 3 2 × = × = (b) 90% of the stored energy is converted to electrical energy, so 3 3 2 3 h 1 s 3600 m 10 7 2 ) s m 8 . 9 ( ) m 150 ( ) m kg 1000 )( 90 . 0 ( ) ( ) h kW 1000 ( h kW 1000 ) 90 . 0 ( h kW 1000 ) ( ) 90 . 0 ( × = = = = . V gh
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