An Iron ball of radius 2 mm and density 7.8 x 103 kg m3 is falling through an oil column of density 0.9 x 103 kg m3 and coefficient of viscosit 0.8 Pa s. Calculate the terminal velocity attained by the ball.
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Answer:
Terminal velocity,v
0
=
9η
2r
2
(ρ−ρ
0
)g
v
0
=
9×0.83
2×(2×10
−3
)
2
×(8−1.3)×10
3
×9.8
=0.07 ms
−1
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