First slide

Fluid statics

Question

A mercury barometer reads 75 cm in vertical position. If the tube is inclined by $60^{0}$ to the vertical, the length of the mercury in the tube will be

Moderate

A

37.5 cm
B

75 cm
C

112.5 cm
D

150 cm

Solution

$\cos 60^{0} = \frac{h}{l}$
or $l = \frac{h}{\cos 60^{0}} = \frac{75}{\frac{1}{2}} cm = 150 cm$
The vertical height of mercury level in a barometer does not change.

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