problem07_60

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

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7.60: a) The change in total energy is the work done by the air, . J 0 . 80 ) m 6 . 53 )( s m 80 . 9 ( ) ) s m 0 . 40 ( ) s m 0 . 30 ( ) s m 6 . 18 (( ) 2 1 ( ) kg 145 . 0 ( ) ( 2 1 ) ( ) ( 2 2 2 2 2 2 1 2 2 1 1 2 2 - = + - - = + - = + - + gy v v m U K U K b) Similarly, . J 3 . 31 ) m 6 . 53 )( s m 80 . 9 ( ) ) s m 6 . 18 ( ) s m 7 . 28 ( ) s m 9 . 11 )(( 2 1 ( ) kg 145 . 0 ( ) ( ) ( 2 2 2 2 2 2 3 3 - = - - - + = + - + U K U K c) The ball is moving slower on the way down, and does not go as far (in the
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Unformatted text preview: x-direction), and so the work done by the air is smaller in magnitude....
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