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Problem 2.44
[Difficulty: 2]
h
y
x
L
V
= 20 ft/s
dy
du
yx
µ
τ
=
Given:
Ice skater and skate geometry
Find:
Deceleration of skater
Solution:
Governing equation:
τ
yx
μ
du
dy
⋅
=
Σ
F
x
Ma
x
⋅
=
Assumptions:
Laminar flow
The given data is
W
100 lbf
⋅
=
V2
0
ft
s
⋅
=
L
11.5 in
⋅
=
w
0.125 in
⋅
=
h
0.0000575 in
⋅
=
μ
3.68
10
5
−
×
lbf s
⋅
ft
2
⋅
=
Table A.7 @32
o
F
Then
τ
yx
μ
du
dy
⋅
=
μ
V
h
⋅
=
3.68
10
5
−
×
lbf s
⋅
ft
2
⋅
20
×
ft
s
⋅
1
0.0000575 in
⋅
×
12 in
⋅
ft
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This note was uploaded on 10/19/2011 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.
 Fall '07
 Lear
 Fluid Mechanics

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