PhysicsA barometer kept in an elevator reads 76 cm when it is at rest. If the elevator goes up with increasing speed, the reading will be 

A barometer kept in an elevator reads 76 cm when it is at rest. If the elevator goes up with increasing speed, the reading will be 

  1. A

    Zero 

  2. B

    76 cm 

  3. C

    >76 cm 

  4. D

    <76 cm

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    Solution:

    When elevator is at rest, the atmospheric pressure measured by the barometer is,

    P0=ρgh

    When the barometer is kept in an elevator moving upwards with acceleration a, the atmospheric pressure measured by it will be,

    P0=ρgh=ρ(g+a)h

    hg=h'(g+a) h'=hg(g+a)<h

    h'<76 cm

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