Q.

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

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a

Zero

b

Equal to 76 cm

c

More than 76 cm

d

Less than 76 cm

answer is D.

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Detailed Solution

h=Pρg ∴h∝1g. 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.
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