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Problem
Problem
The viscous force
F
F
F
on a sphere of radius
a
a
a
moving in a medium with velocity
v
v
v
is given by
F
=
6
π
η
a
v
F = 6\pi \eta a v
F
=
6
π
η
a
v
. The dimensions of
η
\eta
η
are a.
[
M
L
−
3
]
[ML^{-3}]
[
M
L
−
3
]
b.
[
M
L
T
−
2
]
[MLT^{-2}]
[
M
L
T
−
2
]
c.
[
M
T
−
1
]
[MT^{-1}]
[
M
T
−
1
]
d.
[
M
L
−
1
T
−
1
]
[ML^{-1}T^{-1}]
[
M
L
−
1
T
−
1
]
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