Question

Water rises up to 2 centimetre in a capillary tube of length 20 cm held vertically in the capillary is meant by 30 degree from its vertical position. the length of the liquid rises in it

Answer 1

Answer:

i hope you understood

mother formula is h=l cos teeta

Answer 2

The length of liquid rises in it=2.3 cm

Explanation:

Rise of water in a capillary tube,l=AB=2 cm

Length of capillary tube=h=20 cm

$\theta=30^{\circ}$

Let h' be the vertical  length of liquid rises in capillary tube.

Height rise in liquid

$l=\frac{h}{Cos\theta}$

Substitute the values then we get

$Cos 30^{\circ}=\frac{\sqrt 3}{2}$

$h'=\frac{2}{Cos 30^{\circ}}=\frac{2}{\frac{\sqrt 3}{2}}$

Because $Cos 30^{\circ}=\frac{\sqrt 3}{2}$

$h'=\frac{4}{\sqrt 3}=2.3 cm$

Hence, the length of liquid rises in it=2.3 cm

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