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Question

Physics Question on mechanical properties of fluid

A beaker of radius 15 cm15\, cm is filled with a liquid of surface tension 0.75 N/m0.75\, N/m. Force across an imaginary diameter on the surface of the liquid is

A

0.075 N0.075\,N

B

1.5×10−2N1.5\times {{10}^{-2}}N

C

0.225 N0.225\,N

D

2.25×10−2 N2.25\times {{10}^{-2}}\,N

Answer

2.25×10−2 N2.25\times {{10}^{-2}}\,N

Explanation

Solution

Given that surface tension =0.075 N/m=0.075\, N / m;
diameter =30 cm=0.30 m=30\, cm =0.30\, m
∴\therefore Force =0.075×0.30=0.0225 N=2.25×10−2N=0.075 \times 0.30=0.0225\, N =2.25 \times 10^{-2} N