A body of density $D_{1}$ and mass $M$ is moving downward in glycerine of density $D_{2}$ . What is the viscous force acting on it?

M g (1 - \frac{D_{2}}{D_{1}})

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M g (1 - \frac{D_{1}}{D_{2}})

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M g D_{1}

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M g D_{2}

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Solution

The correct option is D $M g (1 - \frac{D_{2}}{D_{1}})$
mass = $M$
Density =D,
density of glycerine = $D_{2}$
now:
Viscous Force
$F = M g$ - (Buoyant Force)
$F = M g - D_{2} (\frac{M}{D_{1}}) g$
$F = M g (1 - \frac{D_{2}}{D_{1}})$
Correct option is $(A)$

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A body of density D1 and mass M is moving downward in glycerine of density D2. What is the viscous force acting on it?

The correct option is D Mg(1−D2D1)mass = MDensity =D,density of glycerine =D2now:Viscous ForceF=Mg - (Buoyant Force)F=Mg−D2(MD1)gF=Mg(1−D2D1)Correct option is (A)

A body of density $D_{1}$ and mass $M$ is moving downward in glycerine of density $D_{2}$ . What is the viscous force acting on it?

The correct option is D $M g (1 - \frac{D_{2}}{D_{1}})$
mass = $M$
Density =D,
density of glycerine = $D_{2}$
now:
Viscous Force
$F = M g$ - (Buoyant Force)
$F = M g - D_{2} (\frac{M}{D_{1}}) g$
$F = M g (1 - \frac{D_{2}}{D_{1}})$
Correct option is $(A)$