problem07_67

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

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7.67: a) Taking 0 ) 0 ( = U , . ) m N 00 . 6 ( ) m N 0 . 30 ( 3 2 ) ( 3 2 2 3 2 0 x x x x dx F x U x x + = + = = β α b) , J 75 . 27 ) ) m 50 . 0 )( m N 00 . 6 ( ) m 50 . 0 )( m N 0 . 30 (( ) ) m 00 . 1 )( m N 00 . 6 ( ) m 00 . 1 )( m N 0 . 30 (( 3 2 2 3 2 2 2 1 2 = + - + = - = U U K and so s m 85 . 7 kg
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