In University Physics with Modern Physics: 12thEdition by Young and Freedman, th

Question

In University Physics with Modern Physics: 12thEdition by Young and Freedman, the answer to chapter 6 problem1E is incorrect. Problem:    A 6.75 kg bucket is pulled upward 4 m by amassless rope. (a) How much work is done on the bucket? (b) How muck work does gravity do? (c)What is the total workdone? The answer on cramster says (a) 264.6 J (b) -264.6 J (c) 0J The answer in the back of the textbook says (a) 3.60 J (b)-0.900 J (c) 2.70 J The answer in the back of the book makes more sense becausethe bucket moves, thus work is done. I don't understand howthat was calculated. Could someone work the problem forme? In University Physics with Modern Physics: 12thEdition by Young and Freedman, the answer to chapter 6 problem1E is incorrect. Problem:    A 6.75 kg bucket is pulled upward 4 m by amassless rope. (a) How much work is done on the bucket? (b) How muck work does gravity do? (c)What is the total workdone? The answer on cramster says (a) 264.6 J (b) -264.6 J (c) 0J The answer in the back of the textbook says (a) 3.60 J (b)-0.900 J (c) 2.70 J The answer in the back of the book makes more sense becausethe bucket moves, thus work is done. I don't understand howthat was calculated. Could someone work the problem forme?

Explanation / Answer

               Given that the mass of the bucket is m = 6.75 kg                The pulled distance is x = 4 m   -------------------------------------------------------------------------------------------- (a)         The workdone on the bucket is                              W = F*x                                   = mg*x                                   = 264.6 J (b)      The work done by thegravity is W = mg*(-x)                                                                  = - 264.6 J (c)                  Totalwork = 264.6 + -264.6 = 0 J                              W = F*x                                   = mg*x                                   = 264.6 J (b)      The work done by thegravity is W = mg*(-x)                                                                  = - 264.6 J (c)                  Totalwork = 264.6 + -264.6 = 0 J

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