Problem Set #5
ME 152B Winter, 2009
Due Monday Feb 23 at 5pm
MIDTERM #2 WEDNESDAY Feb 25th
Reading:
Munson, et al, Chapter 9, Sections 9.1, 9.2 (except 9.2.7), 9.3: Chapter 7, Sections
7.6 (especially the Froude number), 7.8, 7.10 (again): Chapter 10, Sections 10.1, 10.2.
Problem 1
.
Work Problem 9.23
Note:
This is an openended ‘dagger’ problem, which means that the answer requires some
discussion and is not unique.
In this case, you might need to assume some reasonable speed
for the automobile.
Your answers should be
quantitative
, i.e. some numbers over a
reasonable range of highway speeds.
Problem 2.
Work Problem 9.42
Hint:
Since the problem asks you to assume a
terminal velocity
, the problem is steady in the
Lagrangian frame and Newton’s second law reduces to the sum of the forces = 0.
Study
Examples 9.10 and 9.11 carefully.
Problem 3.
Work Problem 9.47
Hint:
Compute the total force as the sum of the force on the pole (taken as a cylinder) and
the sign (taken as a plate perpendicular to the flow). Study Example 9.13.
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 Winter '09
 HOMSY
 Fluid Dynamics, Force, Work problem

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