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Question

A barometer kept in a stationary elevator reads $$76 cm$$ If the elevator starts accelerating up the reading will be


A
zero
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B
Equal to 76 cm
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C
More than 76 cm
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D
Less than 76 cm
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Solution

The correct option is D Less than 76 cm
under normal conditions when the elevator is accelerating upwards the reading in the barometer will be less than 76cm (air pressure is same as external) but as acc. to question the pressure is 76 cm means that the air is applying more pressure to lift the liquid to a height of 76cm.$$h=\dfrac{P}{\rho g} \therefore h \alpha \dfrac{1}{g}$$ If lift moves upward with some acceleration then effective $$g$$ increases. So the value of $$h$$ decreases i.e. reading will be less than $$76 cm.$$

Physics

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