physics

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a student has six textbooks, each has a thickness of 3.6cm and a weight of 28 N. What is the minimum work the student would have to do to place all of the books in a single vertical stack, starting with all the books on the surface of the table?

  • physics -

    Since all of the books are on the table, the 1st book doesn't have to be
    lifted:

    d =d1 + d2 + d3 + d4 + d5 + d6,
    d = 0 + 1*3.6 + 2*3.6 + 3*3.6 + 4*3.6
    + 5*3.6,
    d = 0 + 3.6 + 7.2 + 10.8 + 14.4 + 18.

    W = F(0 + 3.6 + 7.2 + 10.8 + 14.4 + 18)
    W = F * 54cm,
    W = 28 * 0.54m = 15.12 Joules.

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