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17 February, 05:41

Consider a system of an 85.0 kg man, his 14.5-kg dog, and the earth. The gravitational potential energy of the system increases by 1.85 103 J when the man climbs a spiral staircase from the first to the second floor of an apartment building. If his dog climbs a normal staircase from the same first floor to the second floor, by how much does the potential energy of the system increase (in J)

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  1. 17 February, 09:01
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    Increase in gravitational potential energy = m x g x h

    where m is mass, g is gravitational acceleration and h is height

    In the first case when man climbs

    increase in potential = 85 x g x h = 1.85 x 10³ J

    gh = 21.7647

    when dog climbs

    increase in potential = 14.5 x g x h J

    = 14.5 x 21.7647

    = 315.6 J
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