First slide

Pressure in a fluid-mechanical properties of fluids

Question

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

Moderate

A

Zero
B

Equal to 76 cm
C

More than 76 cm
D

Less than 76 cm

Solution

$h = \frac{P}{ρg} ∴ h \propto \frac{1}{g}$ . 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.

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