The velocity of a ball of mass m density d1d1 becomes constant after some time-The viscous force acting on the ball will be-

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Question

The velocity of a ball of mass m density d1 becomes constant after some time.The viscous force acting on the ball will be:

non of these.

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m g (1 - \frac{d_{2}}{d_{1}})

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m g (\frac{d_{1} + d_{2}}{d_{1}})

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m g (\frac{d_{1} + d_{2}}{d_{2}})

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Solution

The correct option is B $m g (1 - \frac{d_{2}}{d_{1}})$
Equating the viscous force with net downward force,
$= 6 π η r v = m g - \frac{m}{d_{1}} d_{2} g$
Viscous force $= m g (1 - \frac{d_{2}}{d_{1}})$

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The velocity of a ball of mass m density d1d1 becomes constant after some time.The viscous force acting on the ball will be:

The correct option is B mg(1−d2d1)Equating the viscous force with net downward force,=6πηrv=mg−md1d2gViscous force=mg(1−d2d1)

The velocity of a ball of mass m density d1 becomes constant after some time.The viscous force acting on the ball will be:

The correct option is B $m g (1 - \frac{d_{2}}{d_{1}})$
Equating the viscous force with net downward force,
$= 6 π η r v = m g - \frac{m}{d_{1}} d_{2} g$
Viscous force $= m g (1 - \frac{d_{2}}{d_{1}})$