problem07_31

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

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7.31: The magnitude of the friction force on the book is N. 68 . 3 ) s m 80 . 9 )( kg 5 . 1 )( 25 . 0 ( 2 k = = mg μ a) The work done during each part of the motion is the same, and the total work done is J 59 ) m 0 . 8 )( N 68 . 3 ( 2 - = - (rounding to two places). b) The magnitude of the displacement is , ) m 0 . 8 ( 2 so the work done by friction is . N 42 ) N 68 . 3 )( m 0 . 8 ( 2 - = - c) The work is the same both coming and going,
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Unformatted text preview: and the total work done is the same as in part (a), . J 59-d) The work required to go from one point to another is not path independent, and the work required for a round trip is not zero, so friction is not a conservative force....
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