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This question paper consists of
3
printed pages,
each of which is identified by
the Code Number CIVE 140001
ª
UNIVERSITY OF LEEDS
May/June 2002
Examination for the degree of
BEng/ MEng
Civil Engineering
FLUID MECHANICS
Time allowed:
2
hours
Attempt
4
questions
Useful formulae:
Parallel axis theorem
2
x
A
I
I
GG
oo
+
=
,
2
nd
moment of area for a rectangle,
12
3
bd
I
GG
=
, and for a triangle
36
3
bd
I
GG
=
1. (a)
A “U”-tube manometer containing mercury of density 13600 kg/m
3
is used to measure the
pressure drop along a horizontal pipe.
If the fluid in the pipe has a relative density of 0.8 and
the manometer reading is 0.6m, what is the pressure difference measured by the manometer?
[8 marks]
(b)
A tank with vertical sides is filled with water to a depth of 4.0m. The water is covered with a
layer of oil 0.5m thick.
If the relative density of the oil is 0.8, find the resultant force (per unit
width) and its line of action on the wall of the tank.
[9 marks]
(c)
Water is being fired at 20 m/s from a hose of 80mm diameter into the atmosphere.
The
water leaves the hose through a nozzle with a diameter of 25mm at its exit.
Find the pressure
just upstream of the nozzle and the force on the nozzle.
[8 marks]
1.a

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