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20 June, 14:52

A 60 kg man is sitting on the floor of an airplane 8000 m high traveling at 850 km/hr. How much total mechanical energy does he have relative to the reference frame of the plane?

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  1. 20 June, 15:21
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    Relative to reference frame of the airplane he's sitting in:

    - - Gravitational potential energy = (mass) (gravity) (height)

    His height above the airplane is zero, so his GPE is zero.

    - - Kinetic energy = (1/2) (mass) (speed) ²

    His speed relative to the airplane is zero, so his KE is zero.

    Mechanical energy = (potential energy) + (kinetic energy)

    Mechanical energy = (0) + (0)

    The poor fellow's total mechanical energy is zero.
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