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Standard XII

Physics

Terminal Velocity

A metal ball ...

Question

A metal ball of radius 2mm and density 10.5gmcm $^{- 3}$ is dropped in glycerine of coefficient of viscosity 9.8 poise and density 1.5 gm cm $^{- 3}$ .The terminal velocity of the ball in cm $s^{- 1}$ is:

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Solution

The correct option is D 8

From the formula of Terminal velocity,
$V = \frac{2 g r^{2} (T - σ)}{9 η} = \frac{2 \times 980 \times (0.2)^{2} (10.5 - 1.5)}{9 \times 9.8} c m / s$
= $8$ cm/s

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A metal ball of radius 2mm and density 10.5gmcm−3 is dropped in glycerine of coefficient of viscosity 9.8 poise and density 1.5 gm cm−3.The terminal velocity of the ball in cm s−1 is:

The correct option is D 8 From the formula of Terminal velocity,V=2gr2(T−σ)9η=2×980×(0.2)2(10.5−1.5)9×9.8cm/s= 8 cm/s

A metal ball of radius 2mm and density 10.5gmcm $^{- 3}$ is dropped in glycerine of coefficient of viscosity 9.8 poise and density 1.5 gm cm $^{- 3}$ .The terminal velocity of the ball in cm $s^{- 1}$ is:

The correct option is D 8

From the formula of Terminal velocity,
$V = \frac{2 g r^{2} (T - σ)}{9 η} = \frac{2 \times 980 \times (0.2)^{2} (10.5 - 1.5)}{9 \times 9.8} c m / s$
= $8$ cm/s