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ME 152A Fall 2008
Problem Set #8
PRACTICE FINAL
Short Answers:
1.
True or False: Honey is a Newtonian fluid.
2.
An aluminum block with a volume of 1 m
3
and specific gravity of 2.7 is tethered to a
piece of cork with specific gravity of 0.24.
a. What is the volume of cork required to keep the pair neutrally buoyant in sea water?
b. What is the volume of cork required to keep the pair neutrally buoyant in fresh water?
Assume both the Aluminum and cork are fully submerged and the weight of the tether is
negligible,
ρ
seawater
=1025 kg/m
3
,
ρ
water
=1000 kg/m
3
.
3.
The velocity field
is valid for what value of C if conservation of
mass is true for an incompressible fluid?
C=___
What is the vorticity of the flow field?
ω
=______________
Is this flow field rotational or irrotational?
_________
4.
When floating in water (
ρ
=1000 kg/m
3
) is a body with equilateral triangle cross section
(SG=0.9), that is very long into the page, more stable in position A or B?
5.
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 Spring '08
 Meinhart,C

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