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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