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A barometer tube reads $76 \mathrm{~cm}$ of mercury. If the tube is gradually inclined at an angle of $60^{\circ}$ with vertical, keeping the open end immersed in the mercury reservoir, the length of the mercury column will be
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The correct answer is:
$152 \mathrm{~cm}$
$\cos 60^{\circ}=\frac{h}{l}$
$\Rightarrow l=\frac{h}{\cos 60^{\circ}}=\frac{76}{1 / 2}$
$\therefore l=152 \mathrm{~cm}$
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