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A barometer kept in an elevator accelera...

A barometer kept in an elevator accelerating upward reads 76 cm. The air pressure in the elevator is

A

`76cm`

B

`lt76 cm`

C

`gt 76 cm`

D

`zero`

Text Solution

Verified by Experts

The correct Answer is:
C
Let `a` be the acceleration of the elevator, then pressure inside the elavator is
`P=rho(g+h)h=rhoxx(g+a)0.76N//m^(2)`
Atmospheric pressure
`P_(a)=rhogx0.76N//m^(2)`
Clearly, the air pressure inside the elavator will be greater than `P_(a), i.e. `76 cm` of `Hg`.
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