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25 July, 11:06

An 8.0-kg history textbook is placed on a 1.25-m high desk. How large is the gravitational potential energy of the textbook-Earth system relative to the desktop?

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Answers (2)
  1. 25 July, 11:53
    0
    Answer

    Gravitational potential energy of the textbook-Earth system relative to the desk = 98 N/m

    Explanation

    Given that,

    Mass of history book = 8kg

    height of book from ground = 1.25m

    acceleration due to gravity = 9.8m/s²

    gravitational potential energy formulaGPE = Fg⋅hGPE = mgh

    where,

    m = mass of object (book)

    g = acceleration due to gravity

    h = the altitude of the object.

    GPE = 8 (9.8) (1.25)

    = 98 N/m

    So, gravitational potential energy of the textbook-Earth system relative to the desk = 98 N/m
  2. 25 July, 13:17
    0
    Answer: 98 J

    Explanation: The energy possessed by a body due to its placement in gravitational field. It is given by:

    G. P. E. = m g h

    m is the mass of the object, g is the acceleration due to gravity and h is the height.

    mass of the book, m = 8.0 kg

    height of the desk on which book is kept, h = 1.25 m

    acceleration due to gravity, g = 9.8 m/s²

    G. P. E = 8.0 kg * 9.8 m/s² * 1.25 m = 98 J.
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