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

# 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

4. D

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### Solution:

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

${P}_{0}=\rho gh$

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

${\mathrm{P}}_{0}={\mathrm{\rho g}}^{\mathrm{\prime }}{\mathrm{h}}^{\mathrm{\prime }}=\mathrm{\rho }\left({\mathrm{g}}^{\mathrm{\prime }}+\mathrm{a}\right){\mathrm{h}}^{\mathrm{\prime }}$

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