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Tardigrade
Question
Physics
A rain drop of radius 0.3 mm has a terminal velocity in air is 1 m/s. The viscosity of air is 8 × 10-5 poise. The viscous force on it is
Q. A rain drop of radius
0.3
mm
has a terminal velocity in air is
1
m
/
s
. The viscosity of air is
8
×
1
0
−
5
poise. The viscous force on it is
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A
45.2
×
1
0
−
4
dyne
B
101.73
×
1
0
−
5
dyne
C
16.95
×
1
0
−
4
dyne
D
16.95
×
1
0
−
5
dyne
Solution:
Radius of drop,
r
=
0.3
mm
=
0.03
c
m
Terminal velocity,
v
=
1
m
/
s
=
100
c
m
/
sec
Viscosity of air,
η
=
8
×
1
0
−
5
poise
Viscous force,
f
=
6
π
ηr
v
F
=
6
×
3.14
×
(
8
×
1
0
−
5
)
×
0.03
×
100
=
4.42
×
1
0
−
3
dyne