First slide

Surface tension

Question

There is a small hole in a hollow sphere. The water enters in it when it is taken to a depth of 40 cm under water. The surface tension of water is 0.07 N/m. The diameter of hole is

Easy

A

7 mm
B

0.07 mm
C

0.0007 mm
D

0.7 m

Solution

$P = \frac{2 T}{r} ∴ r = \frac{2 T}{P} o r r = \frac{2 \times 70}{40 \times 1 \times 10} = 0 \cdot 35 c m D i a m e t e r = 2 r = 0 . 7 c m = 7 m m$

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