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TS EAMCET 18-July-2022 Shift 2 Solved Paper
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© examsnet.com
Question : 95
Total: 160
What is the terminal velocity of a rain drop of radius
0.02
m
m
?
[Note that the coefficient of viscosity of air is
1.8
×
10
−
5
N
∕
m
2
, density of water is
1000
K
g
∕
m
3
. Use
g
=
10
m
∕
s
2
and density of air can be neglected in comparison with density of water]
4.9
c
m
∕
s
9.8
c
m
∕
s
0.49
c
m
∕
s
49
c
m
∕
s
Validate
Solution:
We know that,
v
Terminal
=
2
g
r
2
9
η
(
ρ
b
−
ρ
l
)
where,
ρ
b
=
density of bod
y
=
1000
kg
∕
m
3
ρ
l
=
density of liquid or air
=
0
kg
∕
m
3
v
Terminal
=
2
9
×
10
1.8
×
10
−
5
×
(
0.02
1000
)
2
(
1000
−
0
)
v
Tcrminal
=
4.9
cm
∕
s
© examsnet.com
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