What is the force necessary to raise a circular ring of radius 10 cm placed on the surface of water (T = 75 dyne/cm):

30 dyne

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π

dyne

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750

π

dyne

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1500

π

dyne

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Solution

The correct option is C 750 $π$ dyne
$F = S \times L$

$= S \times π r$

$75 d y n e / c m \times π \times 10 c m$

$75 \times π \times 10 d y n e$

$750 π$

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What is the force necessary to raise a circular ring of radius 10 cm placed on the surface of water (T = 75 dyne/cm):

The correct option is C 750 π dyneF=S×L =S×πr 75 dyne/cm×π×10 cm 75×π×10 dyne 750π

The correct option is C 750 $π$ dyne
$F = S \times L$

$= S \times π r$

$75 d y n e / c m \times π \times 10 c m$

$75 \times π \times 10 d y n e$

$750 π$