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Standard VIII

Physics

Viscosity

A force of 3....

Question

A force of 3.14 N is required to drag a sphere of radius 4 cm with a speed of 5 m $s^{- 1}$ in a medium in gravity free space. Find the coefficient of the viscosity of the medium.

F =

9 π η r v

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F =

6 π η r v

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F =

7 π η r v

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F =

8 π η r v

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Solution

The correct option is A F = $6 π η r v$
F = $6 π η r v$
$η = \frac{F}{6 π r v} = \frac{3.14}{(6) (3.14) (4) (5 \times 10^{2})} = 8.3 \times 10^{- 5} p o i s e$

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A force of 3.14 N is required to drag a sphere of radius 4 cm with a speed of 5 m s−1 in a medium in gravity free space. Find the coefficient of the viscosity of the medium.

The correct option is A F = 6πηrvF = 6πηrvη=F6πrv=3.14(6)(3.14)(4)(5×102)=8.3×10−5poise

A force of 3.14 N is required to drag a sphere of radius 4 cm with a speed of 5 m $s^{- 1}$ in a medium in gravity free space. Find the coefficient of the viscosity of the medium.

The correct option is A F = $6 π η r v$
F = $6 π η r v$
$η = \frac{F}{6 π r v} = \frac{3.14}{(6) (3.14) (4) (5 \times 10^{2})} = 8.3 \times 10^{- 5} p o i s e$